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  1. /*
  2.  Copyright 2003 VMware, Inc.
  3.  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
  4.  Intel funded Tungsten Graphics to
  5.  develop this 3D driver.
  6.  
  7.  Permission is hereby granted, free of charge, to any person obtaining
  8.  a copy of this software and associated documentation files (the
  9.  "Software"), to deal in the Software without restriction, including
  10.  without limitation the rights to use, copy, modify, merge, publish,
  11.  distribute, sublicense, and/or sell copies of the Software, and to
  12.  permit persons to whom the Software is furnished to do so, subject to
  13.  the following conditions:
  14.  
  15.  The above copyright notice and this permission notice (including the
  16.  next paragraph) shall be included in all copies or substantial
  17.  portions of the Software.
  18.  
  19.  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20.  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21.  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  22.  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  23.  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24.  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25.  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26.  
  27.  **********************************************************************/
  28.  /*
  29.   * Authors:
  30.   *   Keith Whitwell <keithw@vmware.com>
  31.   */
  32.  
  33.  
  34. #include "main/api_exec.h"
  35. #include "main/context.h"
  36. #include "main/fbobject.h"
  37. #include "main/extensions.h"
  38. #include "main/imports.h"
  39. #include "main/macros.h"
  40. #include "main/points.h"
  41. #include "main/version.h"
  42. #include "main/vtxfmt.h"
  43. #include "main/texobj.h"
  44.  
  45. #include "vbo/vbo_context.h"
  46.  
  47. #include "drivers/common/driverfuncs.h"
  48. #include "drivers/common/meta.h"
  49. #include "utils.h"
  50.  
  51. #include "brw_context.h"
  52. #include "brw_defines.h"
  53. #include "brw_draw.h"
  54. #include "brw_state.h"
  55.  
  56. #include "intel_batchbuffer.h"
  57. #include "intel_buffer_objects.h"
  58. #include "intel_buffers.h"
  59. #include "intel_fbo.h"
  60. #include "intel_mipmap_tree.h"
  61. #include "intel_pixel.h"
  62. #include "intel_image.h"
  63. #include "intel_tex.h"
  64. #include "intel_tex_obj.h"
  65.  
  66. #include "swrast_setup/swrast_setup.h"
  67. #include "tnl/tnl.h"
  68. #include "tnl/t_pipeline.h"
  69. #include "util/ralloc.h"
  70.  
  71. #include "glsl/nir/nir.h"
  72.  
  73. /***************************************
  74.  * Mesa's Driver Functions
  75.  ***************************************/
  76.  
  77. static size_t
  78. brw_query_samples_for_format(struct gl_context *ctx, GLenum target,
  79.                              GLenum internalFormat, int samples[16])
  80. {
  81.    struct brw_context *brw = brw_context(ctx);
  82.  
  83.    (void) target;
  84.  
  85.    switch (brw->gen) {
  86.    case 9:
  87.    case 8:
  88.       samples[0] = 8;
  89.       samples[1] = 4;
  90.       samples[2] = 2;
  91.       return 3;
  92.  
  93.    case 7:
  94.       samples[0] = 8;
  95.       samples[1] = 4;
  96.       return 2;
  97.  
  98.    case 6:
  99.       samples[0] = 4;
  100.       return 1;
  101.  
  102.    default:
  103.       assert(brw->gen < 6);
  104.       samples[0] = 1;
  105.       return 1;
  106.    }
  107. }
  108.  
  109. const char *const brw_vendor_string = "Intel Open Source Technology Center";
  110.  
  111. const char *
  112. brw_get_renderer_string(unsigned deviceID)
  113. {
  114.    const char *chipset;
  115.    static char buffer[128];
  116.  
  117.    switch (deviceID) {
  118. #undef CHIPSET
  119. #define CHIPSET(id, symbol, str) case id: chipset = str; break;
  120. #include "pci_ids/i965_pci_ids.h"
  121.    default:
  122.       chipset = "Unknown Intel Chipset";
  123.       break;
  124.    }
  125.  
  126.    (void) driGetRendererString(buffer, chipset, 0);
  127.    return buffer;
  128. }
  129.  
  130. static const GLubyte *
  131. intel_get_string(struct gl_context * ctx, GLenum name)
  132. {
  133.    const struct brw_context *const brw = brw_context(ctx);
  134.  
  135.    switch (name) {
  136.    case GL_VENDOR:
  137.       return (GLubyte *) brw_vendor_string;
  138.  
  139.    case GL_RENDERER:
  140.       return
  141.          (GLubyte *) brw_get_renderer_string(brw->intelScreen->deviceID);
  142.  
  143.    default:
  144.       return NULL;
  145.    }
  146. }
  147.  
  148. static void
  149. intel_viewport(struct gl_context *ctx)
  150. {
  151.    struct brw_context *brw = brw_context(ctx);
  152.    __DRIcontext *driContext = brw->driContext;
  153.  
  154.    if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  155.       dri2InvalidateDrawable(driContext->driDrawablePriv);
  156.       dri2InvalidateDrawable(driContext->driReadablePriv);
  157.    }
  158. }
  159.  
  160. static void
  161. intel_update_state(struct gl_context * ctx, GLuint new_state)
  162. {
  163.    struct brw_context *brw = brw_context(ctx);
  164.    struct intel_texture_object *tex_obj;
  165.    struct intel_renderbuffer *depth_irb;
  166.  
  167.    if (ctx->swrast_context)
  168.       _swrast_InvalidateState(ctx, new_state);
  169.    _vbo_InvalidateState(ctx, new_state);
  170.  
  171.    brw->NewGLState |= new_state;
  172.  
  173.    _mesa_unlock_context_textures(ctx);
  174.  
  175.    /* Resolve the depth buffer's HiZ buffer. */
  176.    depth_irb = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_DEPTH);
  177.    if (depth_irb)
  178.       intel_renderbuffer_resolve_hiz(brw, depth_irb);
  179.  
  180.    /* Resolve depth buffer and render cache of each enabled texture. */
  181.    int maxEnabledUnit = ctx->Texture._MaxEnabledTexImageUnit;
  182.    for (int i = 0; i <= maxEnabledUnit; i++) {
  183.       if (!ctx->Texture.Unit[i]._Current)
  184.          continue;
  185.       tex_obj = intel_texture_object(ctx->Texture.Unit[i]._Current);
  186.       if (!tex_obj || !tex_obj->mt)
  187.          continue;
  188.       intel_miptree_all_slices_resolve_depth(brw, tex_obj->mt);
  189.       intel_miptree_resolve_color(brw, tex_obj->mt);
  190.       brw_render_cache_set_check_flush(brw, tex_obj->mt->bo);
  191.    }
  192.  
  193.    _mesa_lock_context_textures(ctx);
  194. }
  195.  
  196. #define flushFront(screen)      ((screen)->image.loader ? (screen)->image.loader->flushFrontBuffer : (screen)->dri2.loader->flushFrontBuffer)
  197.  
  198. static void
  199. intel_flush_front(struct gl_context *ctx)
  200. {
  201.    struct brw_context *brw = brw_context(ctx);
  202.    __DRIcontext *driContext = brw->driContext;
  203.    __DRIdrawable *driDrawable = driContext->driDrawablePriv;
  204.    __DRIscreen *const screen = brw->intelScreen->driScrnPriv;
  205.  
  206.    if (brw->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  207.       if (flushFront(screen) && driDrawable &&
  208.           driDrawable->loaderPrivate) {
  209.  
  210.          /* Resolve before flushing FAKE_FRONT_LEFT to FRONT_LEFT.
  211.           *
  212.           * This potentially resolves both front and back buffer. It
  213.           * is unnecessary to resolve the back, but harms nothing except
  214.           * performance. And no one cares about front-buffer render
  215.           * performance.
  216.           */
  217.          intel_resolve_for_dri2_flush(brw, driDrawable);
  218.          intel_batchbuffer_flush(brw);
  219.  
  220.          flushFront(screen)(driDrawable, driDrawable->loaderPrivate);
  221.  
  222.          /* We set the dirty bit in intel_prepare_render() if we're
  223.           * front buffer rendering once we get there.
  224.           */
  225.          brw->front_buffer_dirty = false;
  226.       }
  227.    }
  228. }
  229.  
  230. static void
  231. intel_glFlush(struct gl_context *ctx)
  232. {
  233.    struct brw_context *brw = brw_context(ctx);
  234.  
  235.    intel_batchbuffer_flush(brw);
  236.    intel_flush_front(ctx);
  237.  
  238.    brw->need_flush_throttle = true;
  239. }
  240.  
  241. static void
  242. intel_finish(struct gl_context * ctx)
  243. {
  244.    struct brw_context *brw = brw_context(ctx);
  245.  
  246.    intel_glFlush(ctx);
  247.  
  248.    if (brw->batch.last_bo)
  249.       drm_intel_bo_wait_rendering(brw->batch.last_bo);
  250. }
  251.  
  252. static void
  253. brw_init_driver_functions(struct brw_context *brw,
  254.                           struct dd_function_table *functions)
  255. {
  256.    _mesa_init_driver_functions(functions);
  257.  
  258.    /* GLX uses DRI2 invalidate events to handle window resizing.
  259.     * Unfortunately, EGL does not - libEGL is written in XCB (not Xlib),
  260.     * which doesn't provide a mechanism for snooping the event queues.
  261.     *
  262.     * So EGL still relies on viewport hacks to handle window resizing.
  263.     * This should go away with DRI3000.
  264.     */
  265.    if (!brw->driContext->driScreenPriv->dri2.useInvalidate)
  266.       functions->Viewport = intel_viewport;
  267.  
  268.    functions->Flush = intel_glFlush;
  269.    functions->Finish = intel_finish;
  270.    functions->GetString = intel_get_string;
  271.    functions->UpdateState = intel_update_state;
  272.  
  273.    intelInitTextureFuncs(functions);
  274.    intelInitTextureImageFuncs(functions);
  275.    intelInitTextureSubImageFuncs(functions);
  276.    intelInitTextureCopyImageFuncs(functions);
  277.    intelInitCopyImageFuncs(functions);
  278.    intelInitClearFuncs(functions);
  279.    intelInitBufferFuncs(functions);
  280.    intelInitPixelFuncs(functions);
  281.    intelInitBufferObjectFuncs(functions);
  282.    intel_init_syncobj_functions(functions);
  283.    brw_init_object_purgeable_functions(functions);
  284.  
  285.    brwInitFragProgFuncs( functions );
  286.    brw_init_common_queryobj_functions(functions);
  287.    if (brw->gen >= 6)
  288.       gen6_init_queryobj_functions(functions);
  289.    else
  290.       gen4_init_queryobj_functions(functions);
  291.    brw_init_compute_functions(functions);
  292.    if (brw->gen >= 7)
  293.       brw_init_conditional_render_functions(functions);
  294.  
  295.    functions->QuerySamplesForFormat = brw_query_samples_for_format;
  296.  
  297.    functions->NewTransformFeedback = brw_new_transform_feedback;
  298.    functions->DeleteTransformFeedback = brw_delete_transform_feedback;
  299.    functions->GetTransformFeedbackVertexCount =
  300.       brw_get_transform_feedback_vertex_count;
  301.    if (brw->gen >= 7) {
  302.       functions->BeginTransformFeedback = gen7_begin_transform_feedback;
  303.       functions->EndTransformFeedback = gen7_end_transform_feedback;
  304.       functions->PauseTransformFeedback = gen7_pause_transform_feedback;
  305.       functions->ResumeTransformFeedback = gen7_resume_transform_feedback;
  306.    } else {
  307.       functions->BeginTransformFeedback = brw_begin_transform_feedback;
  308.       functions->EndTransformFeedback = brw_end_transform_feedback;
  309.    }
  310.  
  311.    if (brw->gen >= 6)
  312.       functions->GetSamplePosition = gen6_get_sample_position;
  313. }
  314.  
  315. static void
  316. brw_initialize_context_constants(struct brw_context *brw)
  317. {
  318.    struct gl_context *ctx = &brw->ctx;
  319.  
  320.    unsigned max_samplers =
  321.       brw->gen >= 8 || brw->is_haswell ? BRW_MAX_TEX_UNIT : 16;
  322.  
  323.    ctx->Const.QueryCounterBits.Timestamp = 36;
  324.  
  325.    ctx->Const.StripTextureBorder = true;
  326.  
  327.    ctx->Const.MaxDualSourceDrawBuffers = 1;
  328.    ctx->Const.MaxDrawBuffers = BRW_MAX_DRAW_BUFFERS;
  329.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits = max_samplers;
  330.    ctx->Const.MaxTextureCoordUnits = 8; /* Mesa limit */
  331.    ctx->Const.MaxTextureUnits =
  332.       MIN2(ctx->Const.MaxTextureCoordUnits,
  333.            ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits);
  334.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits = max_samplers;
  335.    if (brw->gen >= 6)
  336.       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits = max_samplers;
  337.    else
  338.       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits = 0;
  339.    if (_mesa_extension_override_enables.ARB_compute_shader) {
  340.       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits = BRW_MAX_TEX_UNIT;
  341.       ctx->Const.MaxUniformBufferBindings += 12;
  342.    } else {
  343.       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits = 0;
  344.    }
  345.    ctx->Const.MaxCombinedTextureImageUnits =
  346.       ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits +
  347.       ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits +
  348.       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits +
  349.       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits;
  350.  
  351.    ctx->Const.MaxTextureLevels = 14; /* 8192 */
  352.    if (ctx->Const.MaxTextureLevels > MAX_TEXTURE_LEVELS)
  353.       ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
  354.    ctx->Const.Max3DTextureLevels = 12; /* 2048 */
  355.    ctx->Const.MaxCubeTextureLevels = 14; /* 8192 */
  356.    ctx->Const.MaxTextureMbytes = 1536;
  357.  
  358.    if (brw->gen >= 7)
  359.       ctx->Const.MaxArrayTextureLayers = 2048;
  360.    else
  361.       ctx->Const.MaxArrayTextureLayers = 512;
  362.  
  363.    ctx->Const.MaxTextureRectSize = 1 << 12;
  364.  
  365.    ctx->Const.MaxTextureMaxAnisotropy = 16.0;
  366.  
  367.    ctx->Const.MaxRenderbufferSize = 8192;
  368.  
  369.    /* Hardware only supports a limited number of transform feedback buffers.
  370.     * So we need to override the Mesa default (which is based only on software
  371.     * limits).
  372.     */
  373.    ctx->Const.MaxTransformFeedbackBuffers = BRW_MAX_SOL_BUFFERS;
  374.  
  375.    /* On Gen6, in the worst case, we use up one binding table entry per
  376.     * transform feedback component (see comments above the definition of
  377.     * BRW_MAX_SOL_BINDINGS, in brw_context.h), so we need to advertise a value
  378.     * for MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS equal to
  379.     * BRW_MAX_SOL_BINDINGS.
  380.     *
  381.     * In "separate components" mode, we need to divide this value by
  382.     * BRW_MAX_SOL_BUFFERS, so that the total number of binding table entries
  383.     * used up by all buffers will not exceed BRW_MAX_SOL_BINDINGS.
  384.     */
  385.    ctx->Const.MaxTransformFeedbackInterleavedComponents = BRW_MAX_SOL_BINDINGS;
  386.    ctx->Const.MaxTransformFeedbackSeparateComponents =
  387.       BRW_MAX_SOL_BINDINGS / BRW_MAX_SOL_BUFFERS;
  388.  
  389.    ctx->Const.AlwaysUseGetTransformFeedbackVertexCount = true;
  390.  
  391.    int max_samples;
  392.    const int *msaa_modes = intel_supported_msaa_modes(brw->intelScreen);
  393.    const int clamp_max_samples =
  394.       driQueryOptioni(&brw->optionCache, "clamp_max_samples");
  395.  
  396.    if (clamp_max_samples < 0) {
  397.       max_samples = msaa_modes[0];
  398.    } else {
  399.       /* Select the largest supported MSAA mode that does not exceed
  400.        * clamp_max_samples.
  401.        */
  402.       max_samples = 0;
  403.       for (int i = 0; msaa_modes[i] != 0; ++i) {
  404.          if (msaa_modes[i] <= clamp_max_samples) {
  405.             max_samples = msaa_modes[i];
  406.             break;
  407.          }
  408.       }
  409.    }
  410.  
  411.    ctx->Const.MaxSamples = max_samples;
  412.    ctx->Const.MaxColorTextureSamples = max_samples;
  413.    ctx->Const.MaxDepthTextureSamples = max_samples;
  414.    ctx->Const.MaxIntegerSamples = max_samples;
  415.  
  416.    /* gen6_set_sample_maps() sets SampleMap{2,4,8}x variables which are used
  417.     * to map indices of rectangular grid to sample numbers within a pixel.
  418.     * These variables are used by GL_EXT_framebuffer_multisample_blit_scaled
  419.     * extension implementation. For more details see the comment above
  420.     * gen6_set_sample_maps() definition.
  421.     */
  422.    gen6_set_sample_maps(ctx);
  423.  
  424.    if (brw->gen >= 7)
  425.       ctx->Const.MaxProgramTextureGatherComponents = 4;
  426.    else if (brw->gen == 6)
  427.       ctx->Const.MaxProgramTextureGatherComponents = 1;
  428.  
  429.    ctx->Const.MinLineWidth = 1.0;
  430.    ctx->Const.MinLineWidthAA = 1.0;
  431.    if (brw->gen >= 9 || brw->is_cherryview) {
  432.       ctx->Const.MaxLineWidth = 40.0;
  433.       ctx->Const.MaxLineWidthAA = 40.0;
  434.       ctx->Const.LineWidthGranularity = 0.125;
  435.    } else if (brw->gen >= 6) {
  436.       ctx->Const.MaxLineWidth = 7.375;
  437.       ctx->Const.MaxLineWidthAA = 7.375;
  438.       ctx->Const.LineWidthGranularity = 0.125;
  439.    } else {
  440.       ctx->Const.MaxLineWidth = 7.0;
  441.       ctx->Const.MaxLineWidthAA = 7.0;
  442.       ctx->Const.LineWidthGranularity = 0.5;
  443.    }
  444.  
  445.    ctx->Const.MinPointSize = 1.0;
  446.    ctx->Const.MinPointSizeAA = 1.0;
  447.    ctx->Const.MaxPointSize = 255.0;
  448.    ctx->Const.MaxPointSizeAA = 255.0;
  449.    ctx->Const.PointSizeGranularity = 1.0;
  450.  
  451.    if (brw->gen >= 5 || brw->is_g4x)
  452.       ctx->Const.MaxClipPlanes = 8;
  453.  
  454.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeInstructions = 16 * 1024;
  455.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxAluInstructions = 0;
  456.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxTexInstructions = 0;
  457.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxTexIndirections = 0;
  458.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeAluInstructions = 0;
  459.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeTexInstructions = 0;
  460.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeTexIndirections = 0;
  461.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeAttribs = 16;
  462.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeTemps = 256;
  463.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeAddressRegs = 1;
  464.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeParameters = 1024;
  465.    ctx->Const.Program[MESA_SHADER_VERTEX].MaxEnvParams =
  466.       MIN2(ctx->Const.Program[MESA_SHADER_VERTEX].MaxNativeParameters,
  467.            ctx->Const.Program[MESA_SHADER_VERTEX].MaxEnvParams);
  468.  
  469.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeInstructions = 1024;
  470.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeAluInstructions = 1024;
  471.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeTexInstructions = 1024;
  472.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeTexIndirections = 1024;
  473.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeAttribs = 12;
  474.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeTemps = 256;
  475.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeAddressRegs = 0;
  476.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeParameters = 1024;
  477.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxEnvParams =
  478.       MIN2(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxNativeParameters,
  479.            ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxEnvParams);
  480.  
  481.    /* Fragment shaders use real, 32-bit twos-complement integers for all
  482.     * integer types.
  483.     */
  484.    ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt.RangeMin = 31;
  485.    ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt.RangeMax = 30;
  486.    ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt.Precision = 0;
  487.    ctx->Const.Program[MESA_SHADER_FRAGMENT].HighInt = ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt;
  488.    ctx->Const.Program[MESA_SHADER_FRAGMENT].MediumInt = ctx->Const.Program[MESA_SHADER_FRAGMENT].LowInt;
  489.  
  490.    ctx->Const.Program[MESA_SHADER_VERTEX].LowInt.RangeMin = 31;
  491.    ctx->Const.Program[MESA_SHADER_VERTEX].LowInt.RangeMax = 30;
  492.    ctx->Const.Program[MESA_SHADER_VERTEX].LowInt.Precision = 0;
  493.    ctx->Const.Program[MESA_SHADER_VERTEX].HighInt = ctx->Const.Program[MESA_SHADER_VERTEX].LowInt;
  494.    ctx->Const.Program[MESA_SHADER_VERTEX].MediumInt = ctx->Const.Program[MESA_SHADER_VERTEX].LowInt;
  495.  
  496.    if (brw->gen >= 7) {
  497.       ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
  498.       ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
  499.       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
  500.       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicCounters = MAX_ATOMIC_COUNTERS;
  501.       ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers = BRW_MAX_ABO;
  502.       ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicBuffers = BRW_MAX_ABO;
  503.       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicBuffers = BRW_MAX_ABO;
  504.       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicBuffers = BRW_MAX_ABO;
  505.       ctx->Const.MaxCombinedAtomicBuffers = 3 * BRW_MAX_ABO;
  506.    }
  507.  
  508.    /* Gen6 converts quads to polygon in beginning of 3D pipeline,
  509.     * but we're not sure how it's actually done for vertex order,
  510.     * that affect provoking vertex decision. Always use last vertex
  511.     * convention for quad primitive which works as expected for now.
  512.     */
  513.    if (brw->gen >= 6)
  514.       ctx->Const.QuadsFollowProvokingVertexConvention = false;
  515.  
  516.    ctx->Const.NativeIntegers = true;
  517.    ctx->Const.VertexID_is_zero_based = true;
  518.  
  519.    /* Regarding the CMP instruction, the Ivybridge PRM says:
  520.     *
  521.     *   "For each enabled channel 0b or 1b is assigned to the appropriate flag
  522.     *    bit and 0/all zeros or all ones (e.g, byte 0xFF, word 0xFFFF, DWord
  523.     *    0xFFFFFFFF) is assigned to dst."
  524.     *
  525.     * but PRMs for earlier generations say
  526.     *
  527.     *   "In dword format, one GRF may store up to 8 results. When the register
  528.     *    is used later as a vector of Booleans, as only LSB at each channel
  529.     *    contains meaning [sic] data, software should make sure all higher bits
  530.     *    are masked out (e.g. by 'and-ing' an [sic] 0x01 constant)."
  531.     *
  532.     * We select the representation of a true boolean uniform to be ~0, and fix
  533.     * the results of Gen <= 5 CMP instruction's with -(result & 1).
  534.     */
  535.    ctx->Const.UniformBooleanTrue = ~0;
  536.  
  537.    /* From the gen4 PRM, volume 4 page 127:
  538.     *
  539.     *     "For SURFTYPE_BUFFER non-rendertarget surfaces, this field specifies
  540.     *      the base address of the first element of the surface, computed in
  541.     *      software by adding the surface base address to the byte offset of
  542.     *      the element in the buffer."
  543.     *
  544.     * However, unaligned accesses are slower, so enforce buffer alignment.
  545.     */
  546.    ctx->Const.UniformBufferOffsetAlignment = 16;
  547.    ctx->Const.TextureBufferOffsetAlignment = 16;
  548.  
  549.    if (brw->gen >= 6) {
  550.       ctx->Const.MaxVarying = 32;
  551.       ctx->Const.Program[MESA_SHADER_VERTEX].MaxOutputComponents = 128;
  552.       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxInputComponents = 64;
  553.       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxOutputComponents = 128;
  554.       ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxInputComponents = 128;
  555.    }
  556.  
  557.    static const nir_shader_compiler_options nir_options = {
  558.       .native_integers = true,
  559.       /* In order to help allow for better CSE at the NIR level we tell NIR
  560.        * to split all ffma instructions during opt_algebraic and we then
  561.        * re-combine them as a later step.
  562.        */
  563.       .lower_ffma = true,
  564.       .lower_sub = true,
  565.    };
  566.  
  567.    /* We want the GLSL compiler to emit code that uses condition codes */
  568.    for (int i = 0; i < MESA_SHADER_STAGES; i++) {
  569.       ctx->Const.ShaderCompilerOptions[i].MaxIfDepth = brw->gen < 6 ? 16 : UINT_MAX;
  570.       ctx->Const.ShaderCompilerOptions[i].EmitCondCodes = true;
  571.       ctx->Const.ShaderCompilerOptions[i].EmitNoNoise = true;
  572.       ctx->Const.ShaderCompilerOptions[i].EmitNoMainReturn = true;
  573.       ctx->Const.ShaderCompilerOptions[i].EmitNoIndirectInput = true;
  574.       ctx->Const.ShaderCompilerOptions[i].EmitNoIndirectOutput =
  575.          (i == MESA_SHADER_FRAGMENT);
  576.       ctx->Const.ShaderCompilerOptions[i].EmitNoIndirectTemp =
  577.          (i == MESA_SHADER_FRAGMENT);
  578.       ctx->Const.ShaderCompilerOptions[i].EmitNoIndirectUniform = false;
  579.       ctx->Const.ShaderCompilerOptions[i].LowerClipDistance = true;
  580.    }
  581.  
  582.    ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].OptimizeForAOS = true;
  583.    ctx->Const.ShaderCompilerOptions[MESA_SHADER_GEOMETRY].OptimizeForAOS = true;
  584.  
  585.    if (brw->scalar_vs) {
  586.       /* If we're using the scalar backend for vertex shaders, we need to
  587.        * configure these accordingly.
  588.        */
  589.       ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].EmitNoIndirectOutput = true;
  590.       ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].EmitNoIndirectTemp = true;
  591.       ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].OptimizeForAOS = false;
  592.  
  593.       if (brw_env_var_as_boolean("INTEL_USE_NIR", true))
  594.          ctx->Const.ShaderCompilerOptions[MESA_SHADER_VERTEX].NirOptions = &nir_options;
  595.    }
  596.  
  597.    if (brw_env_var_as_boolean("INTEL_USE_NIR", true))
  598.       ctx->Const.ShaderCompilerOptions[MESA_SHADER_FRAGMENT].NirOptions = &nir_options;
  599.  
  600.    ctx->Const.ShaderCompilerOptions[MESA_SHADER_COMPUTE].NirOptions = &nir_options;
  601.  
  602.    /* ARB_viewport_array */
  603.    if (brw->gen >= 6 && ctx->API == API_OPENGL_CORE) {
  604.       ctx->Const.MaxViewports = GEN6_NUM_VIEWPORTS;
  605.       ctx->Const.ViewportSubpixelBits = 0;
  606.  
  607.       /* Cast to float before negating because MaxViewportWidth is unsigned.
  608.        */
  609.       ctx->Const.ViewportBounds.Min = -(float)ctx->Const.MaxViewportWidth;
  610.       ctx->Const.ViewportBounds.Max = ctx->Const.MaxViewportWidth;
  611.    }
  612.  
  613.    /* ARB_gpu_shader5 */
  614.    if (brw->gen >= 7)
  615.       ctx->Const.MaxVertexStreams = MIN2(4, MAX_VERTEX_STREAMS);
  616. }
  617.  
  618. static void
  619. brw_adjust_cs_context_constants(struct brw_context *brw)
  620. {
  621.    struct gl_context *ctx = &brw->ctx;
  622.  
  623.    /* For ES, we set these constants based on SIMD8.
  624.     *
  625.     * TODO: Once we can always generate SIMD16, we should update this.
  626.     *
  627.     * For GL, we assume we can generate a SIMD16 program, but this currently
  628.     * is not always true. This allows us to run more test cases, and will be
  629.     * required based on desktop GL compute shader requirements.
  630.     */
  631.    const int simd_size = ctx->API == API_OPENGL_CORE ? 16 : 8;
  632.  
  633.    const uint32_t max_invocations = simd_size * brw->max_cs_threads;
  634.    ctx->Const.MaxComputeWorkGroupSize[0] = max_invocations;
  635.    ctx->Const.MaxComputeWorkGroupSize[1] = max_invocations;
  636.    ctx->Const.MaxComputeWorkGroupSize[2] = max_invocations;
  637.    ctx->Const.MaxComputeWorkGroupInvocations = max_invocations;
  638. }
  639.  
  640. /**
  641.  * Process driconf (drirc) options, setting appropriate context flags.
  642.  *
  643.  * intelInitExtensions still pokes at optionCache directly, in order to
  644.  * avoid advertising various extensions.  No flags are set, so it makes
  645.  * sense to continue doing that there.
  646.  */
  647. static void
  648. brw_process_driconf_options(struct brw_context *brw)
  649. {
  650.    struct gl_context *ctx = &brw->ctx;
  651.  
  652.    driOptionCache *options = &brw->optionCache;
  653.    driParseConfigFiles(options, &brw->intelScreen->optionCache,
  654.                        brw->driContext->driScreenPriv->myNum, "i965");
  655.  
  656.    int bo_reuse_mode = driQueryOptioni(options, "bo_reuse");
  657.    switch (bo_reuse_mode) {
  658.    case DRI_CONF_BO_REUSE_DISABLED:
  659.       break;
  660.    case DRI_CONF_BO_REUSE_ALL:
  661.       intel_bufmgr_gem_enable_reuse(brw->bufmgr);
  662.       break;
  663.    }
  664.  
  665.    if (!driQueryOptionb(options, "hiz")) {
  666.        brw->has_hiz = false;
  667.        /* On gen6, you can only do separate stencil with HIZ. */
  668.        if (brw->gen == 6)
  669.           brw->has_separate_stencil = false;
  670.    }
  671.  
  672.    if (driQueryOptionb(options, "always_flush_batch")) {
  673.       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
  674.       brw->always_flush_batch = true;
  675.    }
  676.  
  677.    if (driQueryOptionb(options, "always_flush_cache")) {
  678.       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
  679.       brw->always_flush_cache = true;
  680.    }
  681.  
  682.    if (driQueryOptionb(options, "disable_throttling")) {
  683.       fprintf(stderr, "disabling flush throttling\n");
  684.       brw->disable_throttling = true;
  685.    }
  686.  
  687.    brw->precompile = driQueryOptionb(&brw->optionCache, "shader_precompile");
  688.  
  689.    ctx->Const.ForceGLSLExtensionsWarn =
  690.       driQueryOptionb(options, "force_glsl_extensions_warn");
  691.  
  692.    ctx->Const.DisableGLSLLineContinuations =
  693.       driQueryOptionb(options, "disable_glsl_line_continuations");
  694.  
  695.    ctx->Const.AllowGLSLExtensionDirectiveMidShader =
  696.       driQueryOptionb(options, "allow_glsl_extension_directive_midshader");
  697. }
  698.  
  699. GLboolean
  700. brwCreateContext(gl_api api,
  701.                  const struct gl_config *mesaVis,
  702.                  __DRIcontext *driContextPriv,
  703.                  unsigned major_version,
  704.                  unsigned minor_version,
  705.                  uint32_t flags,
  706.                  bool notify_reset,
  707.                  unsigned *dri_ctx_error,
  708.                  void *sharedContextPrivate)
  709. {
  710.    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
  711.    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
  712.    struct intel_screen *screen = sPriv->driverPrivate;
  713.    const struct brw_device_info *devinfo = screen->devinfo;
  714.    struct dd_function_table functions;
  715.  
  716.    /* Only allow the __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS flag if the kernel
  717.     * provides us with context reset notifications.
  718.     */
  719.    uint32_t allowed_flags = __DRI_CTX_FLAG_DEBUG
  720.       | __DRI_CTX_FLAG_FORWARD_COMPATIBLE;
  721.  
  722.    if (screen->has_context_reset_notification)
  723.       allowed_flags |= __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS;
  724.  
  725.    if (flags & ~allowed_flags) {
  726.       *dri_ctx_error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
  727.       return false;
  728.    }
  729.  
  730.    struct brw_context *brw = rzalloc(NULL, struct brw_context);
  731.    if (!brw) {
  732.       fprintf(stderr, "%s: failed to alloc context\n", __func__);
  733.       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
  734.       return false;
  735.    }
  736.  
  737.    driContextPriv->driverPrivate = brw;
  738.    brw->driContext = driContextPriv;
  739.    brw->intelScreen = screen;
  740.    brw->bufmgr = screen->bufmgr;
  741.  
  742.    brw->gen = devinfo->gen;
  743.    brw->gt = devinfo->gt;
  744.    brw->is_g4x = devinfo->is_g4x;
  745.    brw->is_baytrail = devinfo->is_baytrail;
  746.    brw->is_haswell = devinfo->is_haswell;
  747.    brw->is_cherryview = devinfo->is_cherryview;
  748.    brw->has_llc = devinfo->has_llc;
  749.    brw->has_hiz = devinfo->has_hiz_and_separate_stencil;
  750.    brw->has_separate_stencil = devinfo->has_hiz_and_separate_stencil;
  751.    brw->has_pln = devinfo->has_pln;
  752.    brw->has_compr4 = devinfo->has_compr4;
  753.    brw->has_surface_tile_offset = devinfo->has_surface_tile_offset;
  754.    brw->has_negative_rhw_bug = devinfo->has_negative_rhw_bug;
  755.    brw->needs_unlit_centroid_workaround =
  756.       devinfo->needs_unlit_centroid_workaround;
  757.  
  758.    brw->must_use_separate_stencil = screen->hw_must_use_separate_stencil;
  759.    brw->has_swizzling = screen->hw_has_swizzling;
  760.  
  761.    brw->vs.base.stage = MESA_SHADER_VERTEX;
  762.    brw->gs.base.stage = MESA_SHADER_GEOMETRY;
  763.    brw->wm.base.stage = MESA_SHADER_FRAGMENT;
  764.    if (brw->gen >= 8) {
  765.       gen8_init_vtable_surface_functions(brw);
  766.       brw->vtbl.emit_depth_stencil_hiz = gen8_emit_depth_stencil_hiz;
  767.    } else if (brw->gen >= 7) {
  768.       gen7_init_vtable_surface_functions(brw);
  769.       brw->vtbl.emit_depth_stencil_hiz = gen7_emit_depth_stencil_hiz;
  770.    } else if (brw->gen >= 6) {
  771.       gen6_init_vtable_surface_functions(brw);
  772.       brw->vtbl.emit_depth_stencil_hiz = gen6_emit_depth_stencil_hiz;
  773.    } else {
  774.       gen4_init_vtable_surface_functions(brw);
  775.       brw->vtbl.emit_depth_stencil_hiz = brw_emit_depth_stencil_hiz;
  776.    }
  777.  
  778.    brw_init_driver_functions(brw, &functions);
  779.  
  780.    if (notify_reset)
  781.       functions.GetGraphicsResetStatus = brw_get_graphics_reset_status;
  782.  
  783.    struct gl_context *ctx = &brw->ctx;
  784.  
  785.    if (!_mesa_initialize_context(ctx, api, mesaVis, shareCtx, &functions)) {
  786.       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
  787.       fprintf(stderr, "%s: failed to init mesa context\n", __func__);
  788.       intelDestroyContext(driContextPriv);
  789.       return false;
  790.    }
  791.  
  792.    driContextSetFlags(ctx, flags);
  793.  
  794.    /* Initialize the software rasterizer and helper modules.
  795.     *
  796.     * As of GL 3.1 core, the gen4+ driver doesn't need the swrast context for
  797.     * software fallbacks (which we have to support on legacy GL to do weird
  798.     * glDrawPixels(), glBitmap(), and other functions).
  799.     */
  800.    if (api != API_OPENGL_CORE && api != API_OPENGLES2) {
  801.       _swrast_CreateContext(ctx);
  802.    }
  803.  
  804.    _vbo_CreateContext(ctx);
  805.    if (ctx->swrast_context) {
  806.       _tnl_CreateContext(ctx);
  807.       TNL_CONTEXT(ctx)->Driver.RunPipeline = _tnl_run_pipeline;
  808.       _swsetup_CreateContext(ctx);
  809.  
  810.       /* Configure swrast to match hardware characteristics: */
  811.       _swrast_allow_pixel_fog(ctx, false);
  812.       _swrast_allow_vertex_fog(ctx, true);
  813.    }
  814.  
  815.    _mesa_meta_init(ctx);
  816.  
  817.    brw_process_driconf_options(brw);
  818.    brw_process_intel_debug_variable(brw);
  819.  
  820.    if (brw->gen >= 8 && !(INTEL_DEBUG & DEBUG_VEC4VS))
  821.       brw->scalar_vs = true;
  822.  
  823.    brw_initialize_context_constants(brw);
  824.  
  825.    ctx->Const.ResetStrategy = notify_reset
  826.       ? GL_LOSE_CONTEXT_ON_RESET_ARB : GL_NO_RESET_NOTIFICATION_ARB;
  827.  
  828.    /* Reinitialize the context point state.  It depends on ctx->Const values. */
  829.    _mesa_init_point(ctx);
  830.  
  831.    intel_fbo_init(brw);
  832.  
  833.    intel_batchbuffer_init(brw);
  834.  
  835.    if (brw->gen >= 6) {
  836.       /* Create a new hardware context.  Using a hardware context means that
  837.        * our GPU state will be saved/restored on context switch, allowing us
  838.        * to assume that the GPU is in the same state we left it in.
  839.        *
  840.        * This is required for transform feedback buffer offsets, query objects,
  841.        * and also allows us to reduce how much state we have to emit.
  842.        */
  843.       brw->hw_ctx = drm_intel_gem_context_create(brw->bufmgr);
  844.  
  845.       if (!brw->hw_ctx) {
  846.          fprintf(stderr, "Gen6+ requires Kernel 3.6 or later.\n");
  847.          intelDestroyContext(driContextPriv);
  848.          return false;
  849.       }
  850.    }
  851.  
  852.    brw_init_state(brw);
  853.  
  854.    intelInitExtensions(ctx);
  855.  
  856.    brw_init_surface_formats(brw);
  857.  
  858.    brw->max_vs_threads = devinfo->max_vs_threads;
  859.    brw->max_hs_threads = devinfo->max_hs_threads;
  860.    brw->max_ds_threads = devinfo->max_ds_threads;
  861.    brw->max_gs_threads = devinfo->max_gs_threads;
  862.    brw->max_wm_threads = devinfo->max_wm_threads;
  863.    brw->max_cs_threads = devinfo->max_cs_threads;
  864.    brw->urb.size = devinfo->urb.size;
  865.    brw->urb.min_vs_entries = devinfo->urb.min_vs_entries;
  866.    brw->urb.max_vs_entries = devinfo->urb.max_vs_entries;
  867.    brw->urb.max_hs_entries = devinfo->urb.max_hs_entries;
  868.    brw->urb.max_ds_entries = devinfo->urb.max_ds_entries;
  869.    brw->urb.max_gs_entries = devinfo->urb.max_gs_entries;
  870.  
  871.    brw_adjust_cs_context_constants(brw);
  872.  
  873.    /* Estimate the size of the mappable aperture into the GTT.  There's an
  874.     * ioctl to get the whole GTT size, but not one to get the mappable subset.
  875.     * It turns out it's basically always 256MB, though some ancient hardware
  876.     * was smaller.
  877.     */
  878.    uint32_t gtt_size = 256 * 1024 * 1024;
  879.  
  880.    /* We don't want to map two objects such that a memcpy between them would
  881.     * just fault one mapping in and then the other over and over forever.  So
  882.     * we would need to divide the GTT size by 2.  Additionally, some GTT is
  883.     * taken up by things like the framebuffer and the ringbuffer and such, so
  884.     * be more conservative.
  885.     */
  886.    brw->max_gtt_map_object_size = gtt_size / 4;
  887.  
  888.    if (brw->gen == 6)
  889.       brw->urb.gs_present = false;
  890.  
  891.    brw->prim_restart.in_progress = false;
  892.    brw->prim_restart.enable_cut_index = false;
  893.    brw->gs.enabled = false;
  894.    brw->sf.viewport_transform_enable = true;
  895.  
  896.    brw->predicate.state = BRW_PREDICATE_STATE_RENDER;
  897.  
  898.    ctx->VertexProgram._MaintainTnlProgram = true;
  899.    ctx->FragmentProgram._MaintainTexEnvProgram = true;
  900.  
  901.    brw_draw_init( brw );
  902.  
  903.    if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
  904.       /* Turn on some extra GL_ARB_debug_output generation. */
  905.       brw->perf_debug = true;
  906.    }
  907.  
  908.    if ((flags & __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS) != 0)
  909.       ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB;
  910.  
  911.    if (INTEL_DEBUG & DEBUG_SHADER_TIME)
  912.       brw_init_shader_time(brw);
  913.  
  914.    _mesa_compute_version(ctx);
  915.  
  916.    _mesa_initialize_dispatch_tables(ctx);
  917.    _mesa_initialize_vbo_vtxfmt(ctx);
  918.  
  919.    if (ctx->Extensions.AMD_performance_monitor) {
  920.       brw_init_performance_monitors(brw);
  921.    }
  922.  
  923.    vbo_use_buffer_objects(ctx);
  924.    vbo_always_unmap_buffers(ctx);
  925.  
  926.    return true;
  927. }
  928.  
  929. void
  930. intelDestroyContext(__DRIcontext * driContextPriv)
  931. {
  932.    struct brw_context *brw =
  933.       (struct brw_context *) driContextPriv->driverPrivate;
  934.    struct gl_context *ctx = &brw->ctx;
  935.  
  936.    /* Dump a final BMP in case the application doesn't call SwapBuffers */
  937.    if (INTEL_DEBUG & DEBUG_AUB) {
  938.       intel_batchbuffer_flush(brw);
  939.       aub_dump_bmp(&brw->ctx);
  940.    }
  941.  
  942.    _mesa_meta_free(&brw->ctx);
  943.    brw_meta_fast_clear_free(brw);
  944.  
  945.    if (INTEL_DEBUG & DEBUG_SHADER_TIME) {
  946.       /* Force a report. */
  947.       brw->shader_time.report_time = 0;
  948.  
  949.       brw_collect_and_report_shader_time(brw);
  950.       brw_destroy_shader_time(brw);
  951.    }
  952.  
  953.    brw_destroy_state(brw);
  954.    brw_draw_destroy(brw);
  955.  
  956.    drm_intel_bo_unreference(brw->curbe.curbe_bo);
  957.    if (brw->vs.base.scratch_bo)
  958.       drm_intel_bo_unreference(brw->vs.base.scratch_bo);
  959.    if (brw->gs.base.scratch_bo)
  960.       drm_intel_bo_unreference(brw->gs.base.scratch_bo);
  961.    if (brw->wm.base.scratch_bo)
  962.       drm_intel_bo_unreference(brw->wm.base.scratch_bo);
  963.  
  964.    drm_intel_gem_context_destroy(brw->hw_ctx);
  965.  
  966.    if (ctx->swrast_context) {
  967.       _swsetup_DestroyContext(&brw->ctx);
  968.       _tnl_DestroyContext(&brw->ctx);
  969.    }
  970.    _vbo_DestroyContext(&brw->ctx);
  971.  
  972.    if (ctx->swrast_context)
  973.       _swrast_DestroyContext(&brw->ctx);
  974.  
  975.    intel_batchbuffer_free(brw);
  976.  
  977.    drm_intel_bo_unreference(brw->throttle_batch[1]);
  978.    drm_intel_bo_unreference(brw->throttle_batch[0]);
  979.    brw->throttle_batch[1] = NULL;
  980.    brw->throttle_batch[0] = NULL;
  981.  
  982.    driDestroyOptionCache(&brw->optionCache);
  983.  
  984.    /* free the Mesa context */
  985.    _mesa_free_context_data(&brw->ctx);
  986.  
  987.    ralloc_free(brw);
  988.    driContextPriv->driverPrivate = NULL;
  989. }
  990.  
  991. GLboolean
  992. intelUnbindContext(__DRIcontext * driContextPriv)
  993. {
  994.    /* Unset current context and dispath table */
  995.    _mesa_make_current(NULL, NULL, NULL);
  996.  
  997.    return true;
  998. }
  999.  
  1000. /**
  1001.  * Fixes up the context for GLES23 with our default-to-sRGB-capable behavior
  1002.  * on window system framebuffers.
  1003.  *
  1004.  * Desktop GL is fairly reasonable in its handling of sRGB: You can ask if
  1005.  * your renderbuffer can do sRGB encode, and you can flip a switch that does
  1006.  * sRGB encode if the renderbuffer can handle it.  You can ask specifically
  1007.  * for a visual where you're guaranteed to be capable, but it turns out that
  1008.  * everyone just makes all their ARGB8888 visuals capable and doesn't offer
  1009.  * incapable ones, because there's no difference between the two in resources
  1010.  * used.  Applications thus get built that accidentally rely on the default
  1011.  * visual choice being sRGB, so we make ours sRGB capable.  Everything sounds
  1012.  * great...
  1013.  *
  1014.  * But for GLES2/3, they decided that it was silly to not turn on sRGB encode
  1015.  * for sRGB renderbuffers you made with the GL_EXT_texture_sRGB equivalent.
  1016.  * So they removed the enable knob and made it "if the renderbuffer is sRGB
  1017.  * capable, do sRGB encode".  Then, for your window system renderbuffers, you
  1018.  * can ask for sRGB visuals and get sRGB encode, or not ask for sRGB visuals
  1019.  * and get no sRGB encode (assuming that both kinds of visual are available).
  1020.  * Thus our choice to support sRGB by default on our visuals for desktop would
  1021.  * result in broken rendering of GLES apps that aren't expecting sRGB encode.
  1022.  *
  1023.  * Unfortunately, renderbuffer setup happens before a context is created.  So
  1024.  * in intel_screen.c we always set up sRGB, and here, if you're a GLES2/3
  1025.  * context (without an sRGB visual, though we don't have sRGB visuals exposed
  1026.  * yet), we go turn that back off before anyone finds out.
  1027.  */
  1028. static void
  1029. intel_gles3_srgb_workaround(struct brw_context *brw,
  1030.                             struct gl_framebuffer *fb)
  1031. {
  1032.    struct gl_context *ctx = &brw->ctx;
  1033.  
  1034.    if (_mesa_is_desktop_gl(ctx) || !fb->Visual.sRGBCapable)
  1035.       return;
  1036.  
  1037.    /* Some day when we support the sRGB capable bit on visuals available for
  1038.     * GLES, we'll need to respect that and not disable things here.
  1039.     */
  1040.    fb->Visual.sRGBCapable = false;
  1041.    for (int i = 0; i < BUFFER_COUNT; i++) {
  1042.       if (fb->Attachment[i].Renderbuffer &&
  1043.           fb->Attachment[i].Renderbuffer->Format == MESA_FORMAT_B8G8R8A8_SRGB) {
  1044.          fb->Attachment[i].Renderbuffer->Format = MESA_FORMAT_B8G8R8A8_UNORM;
  1045.       }
  1046.    }
  1047. }
  1048.  
  1049. GLboolean
  1050. intelMakeCurrent(__DRIcontext * driContextPriv,
  1051.                  __DRIdrawable * driDrawPriv,
  1052.                  __DRIdrawable * driReadPriv)
  1053. {
  1054.    struct brw_context *brw;
  1055.    GET_CURRENT_CONTEXT(curCtx);
  1056.  
  1057.    if (driContextPriv)
  1058.       brw = (struct brw_context *) driContextPriv->driverPrivate;
  1059.    else
  1060.       brw = NULL;
  1061.  
  1062.    /* According to the glXMakeCurrent() man page: "Pending commands to
  1063.     * the previous context, if any, are flushed before it is released."
  1064.     * But only flush if we're actually changing contexts.
  1065.     */
  1066.    if (brw_context(curCtx) && brw_context(curCtx) != brw) {
  1067.       _mesa_flush(curCtx);
  1068.    }
  1069.  
  1070.    if (driContextPriv) {
  1071.       struct gl_context *ctx = &brw->ctx;
  1072.       struct gl_framebuffer *fb, *readFb;
  1073.  
  1074.       if (driDrawPriv == NULL) {
  1075.          fb = _mesa_get_incomplete_framebuffer();
  1076.       } else {
  1077.          fb = driDrawPriv->driverPrivate;
  1078.          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
  1079.       }
  1080.  
  1081.       if (driReadPriv == NULL) {
  1082.          readFb = _mesa_get_incomplete_framebuffer();
  1083.       } else {
  1084.          readFb = driReadPriv->driverPrivate;
  1085.          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
  1086.       }
  1087.  
  1088.       /* The sRGB workaround changes the renderbuffer's format. We must change
  1089.        * the format before the renderbuffer's miptree get's allocated, otherwise
  1090.        * the formats of the renderbuffer and its miptree will differ.
  1091.        */
  1092.       intel_gles3_srgb_workaround(brw, fb);
  1093.       intel_gles3_srgb_workaround(brw, readFb);
  1094.  
  1095.       /* If the context viewport hasn't been initialized, force a call out to
  1096.        * the loader to get buffers so we have a drawable size for the initial
  1097.        * viewport. */
  1098.       if (!brw->ctx.ViewportInitialized)
  1099.          intel_prepare_render(brw);
  1100.  
  1101.       _mesa_make_current(ctx, fb, readFb);
  1102.    } else {
  1103.       _mesa_make_current(NULL, NULL, NULL);
  1104.    }
  1105.  
  1106.    return true;
  1107. }
  1108.  
  1109. void
  1110. intel_resolve_for_dri2_flush(struct brw_context *brw,
  1111.                              __DRIdrawable *drawable)
  1112. {
  1113.    if (brw->gen < 6) {
  1114.       /* MSAA and fast color clear are not supported, so don't waste time
  1115.        * checking whether a resolve is needed.
  1116.        */
  1117.       return;
  1118.    }
  1119.  
  1120.    struct gl_framebuffer *fb = drawable->driverPrivate;
  1121.    struct intel_renderbuffer *rb;
  1122.  
  1123.    /* Usually, only the back buffer will need to be downsampled. However,
  1124.     * the front buffer will also need it if the user has rendered into it.
  1125.     */
  1126.    static const gl_buffer_index buffers[2] = {
  1127.          BUFFER_BACK_LEFT,
  1128.          BUFFER_FRONT_LEFT,
  1129.    };
  1130.  
  1131.    for (int i = 0; i < 2; ++i) {
  1132.       rb = intel_get_renderbuffer(fb, buffers[i]);
  1133.       if (rb == NULL || rb->mt == NULL)
  1134.          continue;
  1135.       if (rb->mt->num_samples <= 1)
  1136.          intel_miptree_resolve_color(brw, rb->mt);
  1137.       else
  1138.          intel_renderbuffer_downsample(brw, rb);
  1139.    }
  1140. }
  1141.  
  1142. static unsigned
  1143. intel_bits_per_pixel(const struct intel_renderbuffer *rb)
  1144. {
  1145.    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
  1146. }
  1147.  
  1148. static void
  1149. intel_query_dri2_buffers(struct brw_context *brw,
  1150.                          __DRIdrawable *drawable,
  1151.                          __DRIbuffer **buffers,
  1152.                          int *count);
  1153.  
  1154. static void
  1155. intel_process_dri2_buffer(struct brw_context *brw,
  1156.                           __DRIdrawable *drawable,
  1157.                           __DRIbuffer *buffer,
  1158.                           struct intel_renderbuffer *rb,
  1159.                           const char *buffer_name);
  1160.  
  1161. static void
  1162. intel_update_image_buffers(struct brw_context *brw, __DRIdrawable *drawable);
  1163.  
  1164. static void
  1165. intel_update_dri2_buffers(struct brw_context *brw, __DRIdrawable *drawable)
  1166. {
  1167.    struct gl_framebuffer *fb = drawable->driverPrivate;
  1168.    struct intel_renderbuffer *rb;
  1169.    __DRIbuffer *buffers = NULL;
  1170.    int i, count;
  1171.    const char *region_name;
  1172.  
  1173.    /* Set this up front, so that in case our buffers get invalidated
  1174.     * while we're getting new buffers, we don't clobber the stamp and
  1175.     * thus ignore the invalidate. */
  1176.    drawable->lastStamp = drawable->dri2.stamp;
  1177.  
  1178.    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
  1179.       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
  1180.  
  1181.    intel_query_dri2_buffers(brw, drawable, &buffers, &count);
  1182.  
  1183.    if (buffers == NULL)
  1184.       return;
  1185.  
  1186.    for (i = 0; i < count; i++) {
  1187.        switch (buffers[i].attachment) {
  1188.        case __DRI_BUFFER_FRONT_LEFT:
  1189.            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
  1190.            region_name = "dri2 front buffer";
  1191.            break;
  1192.  
  1193.        case __DRI_BUFFER_FAKE_FRONT_LEFT:
  1194.            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
  1195.            region_name = "dri2 fake front buffer";
  1196.            break;
  1197.  
  1198.        case __DRI_BUFFER_BACK_LEFT:
  1199.            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
  1200.            region_name = "dri2 back buffer";
  1201.            break;
  1202.  
  1203.        case __DRI_BUFFER_DEPTH:
  1204.        case __DRI_BUFFER_HIZ:
  1205.        case __DRI_BUFFER_DEPTH_STENCIL:
  1206.        case __DRI_BUFFER_STENCIL:
  1207.        case __DRI_BUFFER_ACCUM:
  1208.        default:
  1209.            fprintf(stderr,
  1210.                    "unhandled buffer attach event, attachment type %d\n",
  1211.                    buffers[i].attachment);
  1212.            return;
  1213.        }
  1214.  
  1215.        intel_process_dri2_buffer(brw, drawable, &buffers[i], rb, region_name);
  1216.    }
  1217.  
  1218. }
  1219.  
  1220. void
  1221. intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
  1222. {
  1223.    struct brw_context *brw = context->driverPrivate;
  1224.    __DRIscreen *screen = brw->intelScreen->driScrnPriv;
  1225.  
  1226.    /* Set this up front, so that in case our buffers get invalidated
  1227.     * while we're getting new buffers, we don't clobber the stamp and
  1228.     * thus ignore the invalidate. */
  1229.    drawable->lastStamp = drawable->dri2.stamp;
  1230.  
  1231.    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
  1232.       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
  1233.  
  1234.    if (screen->image.loader)
  1235.       intel_update_image_buffers(brw, drawable);
  1236.    else
  1237.       intel_update_dri2_buffers(brw, drawable);
  1238.  
  1239.    driUpdateFramebufferSize(&brw->ctx, drawable);
  1240. }
  1241.  
  1242. /**
  1243.  * intel_prepare_render should be called anywhere that curent read/drawbuffer
  1244.  * state is required.
  1245.  */
  1246. void
  1247. intel_prepare_render(struct brw_context *brw)
  1248. {
  1249.    struct gl_context *ctx = &brw->ctx;
  1250.    __DRIcontext *driContext = brw->driContext;
  1251.    __DRIdrawable *drawable;
  1252.  
  1253.    drawable = driContext->driDrawablePriv;
  1254.    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
  1255.       if (drawable->lastStamp != drawable->dri2.stamp)
  1256.          intel_update_renderbuffers(driContext, drawable);
  1257.       driContext->dri2.draw_stamp = drawable->dri2.stamp;
  1258.    }
  1259.  
  1260.    drawable = driContext->driReadablePriv;
  1261.    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
  1262.       if (drawable->lastStamp != drawable->dri2.stamp)
  1263.          intel_update_renderbuffers(driContext, drawable);
  1264.       driContext->dri2.read_stamp = drawable->dri2.stamp;
  1265.    }
  1266.  
  1267.    /* If we're currently rendering to the front buffer, the rendering
  1268.     * that will happen next will probably dirty the front buffer.  So
  1269.     * mark it as dirty here.
  1270.     */
  1271.    if (brw_is_front_buffer_drawing(ctx->DrawBuffer))
  1272.       brw->front_buffer_dirty = true;
  1273. }
  1274.  
  1275. /**
  1276.  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
  1277.  *
  1278.  * To determine which DRI buffers to request, examine the renderbuffers
  1279.  * attached to the drawable's framebuffer. Then request the buffers with
  1280.  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
  1281.  *
  1282.  * This is called from intel_update_renderbuffers().
  1283.  *
  1284.  * \param drawable      Drawable whose buffers are queried.
  1285.  * \param buffers       [out] List of buffers returned by DRI2 query.
  1286.  * \param buffer_count  [out] Number of buffers returned.
  1287.  *
  1288.  * \see intel_update_renderbuffers()
  1289.  * \see DRI2GetBuffers()
  1290.  * \see DRI2GetBuffersWithFormat()
  1291.  */
  1292. static void
  1293. intel_query_dri2_buffers(struct brw_context *brw,
  1294.                          __DRIdrawable *drawable,
  1295.                          __DRIbuffer **buffers,
  1296.                          int *buffer_count)
  1297. {
  1298.    __DRIscreen *screen = brw->intelScreen->driScrnPriv;
  1299.    struct gl_framebuffer *fb = drawable->driverPrivate;
  1300.    int i = 0;
  1301.    unsigned attachments[8];
  1302.  
  1303.    struct intel_renderbuffer *front_rb;
  1304.    struct intel_renderbuffer *back_rb;
  1305.  
  1306.    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
  1307.    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
  1308.  
  1309.    memset(attachments, 0, sizeof(attachments));
  1310.    if ((brw_is_front_buffer_drawing(fb) ||
  1311.         brw_is_front_buffer_reading(fb) ||
  1312.         !back_rb) && front_rb) {
  1313.       /* If a fake front buffer is in use, then querying for
  1314.        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
  1315.        * the real front buffer to the fake front buffer.  So before doing the
  1316.        * query, we need to make sure all the pending drawing has landed in the
  1317.        * real front buffer.
  1318.        */
  1319.       intel_batchbuffer_flush(brw);
  1320.       intel_flush_front(&brw->ctx);
  1321.  
  1322.       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
  1323.       attachments[i++] = intel_bits_per_pixel(front_rb);
  1324.    } else if (front_rb && brw->front_buffer_dirty) {
  1325.       /* We have pending front buffer rendering, but we aren't querying for a
  1326.        * front buffer.  If the front buffer we have is a fake front buffer,
  1327.        * the X server is going to throw it away when it processes the query.
  1328.        * So before doing the query, make sure all the pending drawing has
  1329.        * landed in the real front buffer.
  1330.        */
  1331.       intel_batchbuffer_flush(brw);
  1332.       intel_flush_front(&brw->ctx);
  1333.    }
  1334.  
  1335.    if (back_rb) {
  1336.       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
  1337.       attachments[i++] = intel_bits_per_pixel(back_rb);
  1338.    }
  1339.  
  1340.    assert(i <= ARRAY_SIZE(attachments));
  1341.  
  1342.    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
  1343.                                                         &drawable->w,
  1344.                                                         &drawable->h,
  1345.                                                         attachments, i / 2,
  1346.                                                         buffer_count,
  1347.                                                         drawable->loaderPrivate);
  1348. }
  1349.  
  1350. /**
  1351.  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
  1352.  *
  1353.  * This is called from intel_update_renderbuffers().
  1354.  *
  1355.  * \par Note:
  1356.  *    DRI buffers whose attachment point is DRI2BufferStencil or
  1357.  *    DRI2BufferDepthStencil are handled as special cases.
  1358.  *
  1359.  * \param buffer_name is a human readable name, such as "dri2 front buffer",
  1360.  *        that is passed to drm_intel_bo_gem_create_from_name().
  1361.  *
  1362.  * \see intel_update_renderbuffers()
  1363.  */
  1364. static void
  1365. intel_process_dri2_buffer(struct brw_context *brw,
  1366.                           __DRIdrawable *drawable,
  1367.                           __DRIbuffer *buffer,
  1368.                           struct intel_renderbuffer *rb,
  1369.                           const char *buffer_name)
  1370. {
  1371.    struct gl_framebuffer *fb = drawable->driverPrivate;
  1372.    drm_intel_bo *bo;
  1373.  
  1374.    if (!rb)
  1375.       return;
  1376.  
  1377.    unsigned num_samples = rb->Base.Base.NumSamples;
  1378.  
  1379.    /* We try to avoid closing and reopening the same BO name, because the first
  1380.     * use of a mapping of the buffer involves a bunch of page faulting which is
  1381.     * moderately expensive.
  1382.     */
  1383.    struct intel_mipmap_tree *last_mt;
  1384.    if (num_samples == 0)
  1385.       last_mt = rb->mt;
  1386.    else
  1387.       last_mt = rb->singlesample_mt;
  1388.  
  1389.    uint32_t old_name = 0;
  1390.    if (last_mt) {
  1391.        /* The bo already has a name because the miptree was created by a
  1392.         * previous call to intel_process_dri2_buffer(). If a bo already has a
  1393.         * name, then drm_intel_bo_flink() is a low-cost getter.  It does not
  1394.         * create a new name.
  1395.         */
  1396.       drm_intel_bo_flink(last_mt->bo, &old_name);
  1397.    }
  1398.  
  1399.    if (old_name == buffer->name)
  1400.       return;
  1401.  
  1402.    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
  1403.       fprintf(stderr,
  1404.               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
  1405.               buffer->name, buffer->attachment,
  1406.               buffer->cpp, buffer->pitch);
  1407.    }
  1408.  
  1409.    intel_miptree_release(&rb->mt);
  1410.    bo = drm_intel_bo_gem_create_from_name(brw->bufmgr, buffer_name,
  1411.                                           buffer->name);
  1412.    if (!bo) {
  1413.       fprintf(stderr,
  1414.               "Failed to open BO for returned DRI2 buffer "
  1415.               "(%dx%d, %s, named %d).\n"
  1416.               "This is likely a bug in the X Server that will lead to a "
  1417.               "crash soon.\n",
  1418.               drawable->w, drawable->h, buffer_name, buffer->name);
  1419.       return;
  1420.    }
  1421.  
  1422.    intel_update_winsys_renderbuffer_miptree(brw, rb, bo,
  1423.                                             drawable->w, drawable->h,
  1424.                                             buffer->pitch);
  1425.  
  1426.    if (brw_is_front_buffer_drawing(fb) &&
  1427.        (buffer->attachment == __DRI_BUFFER_FRONT_LEFT ||
  1428.         buffer->attachment == __DRI_BUFFER_FAKE_FRONT_LEFT) &&
  1429.        rb->Base.Base.NumSamples > 1) {
  1430.       intel_renderbuffer_upsample(brw, rb);
  1431.    }
  1432.  
  1433.    assert(rb->mt);
  1434.  
  1435.    drm_intel_bo_unreference(bo);
  1436. }
  1437.  
  1438. /**
  1439.  * \brief Query DRI image loader to obtain a DRIdrawable's buffers.
  1440.  *
  1441.  * To determine which DRI buffers to request, examine the renderbuffers
  1442.  * attached to the drawable's framebuffer. Then request the buffers from
  1443.  * the image loader
  1444.  *
  1445.  * This is called from intel_update_renderbuffers().
  1446.  *
  1447.  * \param drawable      Drawable whose buffers are queried.
  1448.  * \param buffers       [out] List of buffers returned by DRI2 query.
  1449.  * \param buffer_count  [out] Number of buffers returned.
  1450.  *
  1451.  * \see intel_update_renderbuffers()
  1452.  */
  1453.  
  1454. static void
  1455. intel_update_image_buffer(struct brw_context *intel,
  1456.                           __DRIdrawable *drawable,
  1457.                           struct intel_renderbuffer *rb,
  1458.                           __DRIimage *buffer,
  1459.                           enum __DRIimageBufferMask buffer_type)
  1460. {
  1461.    struct gl_framebuffer *fb = drawable->driverPrivate;
  1462.  
  1463.    if (!rb || !buffer->bo)
  1464.       return;
  1465.  
  1466.    unsigned num_samples = rb->Base.Base.NumSamples;
  1467.  
  1468.    /* Check and see if we're already bound to the right
  1469.     * buffer object
  1470.     */
  1471.    struct intel_mipmap_tree *last_mt;
  1472.    if (num_samples == 0)
  1473.       last_mt = rb->mt;
  1474.    else
  1475.       last_mt = rb->singlesample_mt;
  1476.  
  1477.    if (last_mt && last_mt->bo == buffer->bo)
  1478.       return;
  1479.  
  1480.    intel_update_winsys_renderbuffer_miptree(intel, rb, buffer->bo,
  1481.                                             buffer->width, buffer->height,
  1482.                                             buffer->pitch);
  1483.  
  1484.    if (brw_is_front_buffer_drawing(fb) &&
  1485.        buffer_type == __DRI_IMAGE_BUFFER_FRONT &&
  1486.        rb->Base.Base.NumSamples > 1) {
  1487.       intel_renderbuffer_upsample(intel, rb);
  1488.    }
  1489. }
  1490.  
  1491. static void
  1492. intel_update_image_buffers(struct brw_context *brw, __DRIdrawable *drawable)
  1493. {
  1494.    struct gl_framebuffer *fb = drawable->driverPrivate;
  1495.    __DRIscreen *screen = brw->intelScreen->driScrnPriv;
  1496.    struct intel_renderbuffer *front_rb;
  1497.    struct intel_renderbuffer *back_rb;
  1498.    struct __DRIimageList images;
  1499.    unsigned int format;
  1500.    uint32_t buffer_mask = 0;
  1501.  
  1502.    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
  1503.    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
  1504.  
  1505.    if (back_rb)
  1506.       format = intel_rb_format(back_rb);
  1507.    else if (front_rb)
  1508.       format = intel_rb_format(front_rb);
  1509.    else
  1510.       return;
  1511.  
  1512.    if (front_rb && (brw_is_front_buffer_drawing(fb) ||
  1513.                     brw_is_front_buffer_reading(fb) || !back_rb)) {
  1514.       buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
  1515.    }
  1516.  
  1517.    if (back_rb)
  1518.       buffer_mask |= __DRI_IMAGE_BUFFER_BACK;
  1519.  
  1520.    (*screen->image.loader->getBuffers) (drawable,
  1521.                                         driGLFormatToImageFormat(format),
  1522.                                         &drawable->dri2.stamp,
  1523.                                         drawable->loaderPrivate,
  1524.                                         buffer_mask,
  1525.                                         &images);
  1526.  
  1527.    if (images.image_mask & __DRI_IMAGE_BUFFER_FRONT) {
  1528.       drawable->w = images.front->width;
  1529.       drawable->h = images.front->height;
  1530.       intel_update_image_buffer(brw,
  1531.                                 drawable,
  1532.                                 front_rb,
  1533.                                 images.front,
  1534.                                 __DRI_IMAGE_BUFFER_FRONT);
  1535.    }
  1536.    if (images.image_mask & __DRI_IMAGE_BUFFER_BACK) {
  1537.       drawable->w = images.back->width;
  1538.       drawable->h = images.back->height;
  1539.       intel_update_image_buffer(brw,
  1540.                                 drawable,
  1541.                                 back_rb,
  1542.                                 images.back,
  1543.                                 __DRI_IMAGE_BUFFER_BACK);
  1544.    }
  1545. }
  1546.