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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28.  
  29. #include "main/glheader.h"
  30. #include "main/context.h"
  31. #include "main/macros.h"
  32. #include "main/enums.h"
  33. #include "main/fbobject.h"
  34. #include "main/dd.h"
  35. #include "main/state.h"
  36. #include "main/stencil.h"
  37. #include "tnl/tnl.h"
  38. #include "tnl/t_context.h"
  39.  
  40. #include "drivers/common/driverfuncs.h"
  41.  
  42. #include "intel_fbo.h"
  43. #include "intel_screen.h"
  44. #include "intel_batchbuffer.h"
  45. #include "intel_buffers.h"
  46.  
  47. #include "i915_context.h"
  48. #include "i915_reg.h"
  49.  
  50. #define FILE_DEBUG_FLAG DEBUG_STATE
  51.  
  52. void
  53. i915_update_stencil(struct gl_context * ctx)
  54. {
  55.    struct i915_context *i915 = I915_CONTEXT(ctx);
  56.    GLuint front_ref, front_writemask, front_mask;
  57.    GLenum front_func, front_fail, front_pass_z_fail, front_pass_z_pass;
  58.    GLuint back_ref, back_writemask, back_mask;
  59.    GLenum back_func, back_fail, back_pass_z_fail, back_pass_z_pass;
  60.    GLuint dirty = 0;
  61.  
  62.    /* The 915 considers CW to be "front" for two-sided stencil, so choose
  63.     * appropriately.
  64.     */
  65.    /* _NEW_POLYGON | _NEW_STENCIL */
  66.    if (ctx->Polygon.FrontFace == GL_CW) {
  67.       front_ref = _mesa_get_stencil_ref(ctx, 0);
  68.       front_mask = ctx->Stencil.ValueMask[0];
  69.       front_writemask = ctx->Stencil.WriteMask[0];
  70.       front_func = ctx->Stencil.Function[0];
  71.       front_fail = ctx->Stencil.FailFunc[0];
  72.       front_pass_z_fail = ctx->Stencil.ZFailFunc[0];
  73.       front_pass_z_pass = ctx->Stencil.ZPassFunc[0];
  74.       back_ref = _mesa_get_stencil_ref(ctx, ctx->Stencil._BackFace);
  75.       back_mask = ctx->Stencil.ValueMask[ctx->Stencil._BackFace];
  76.       back_writemask = ctx->Stencil.WriteMask[ctx->Stencil._BackFace];
  77.       back_func = ctx->Stencil.Function[ctx->Stencil._BackFace];
  78.       back_fail = ctx->Stencil.FailFunc[ctx->Stencil._BackFace];
  79.       back_pass_z_fail = ctx->Stencil.ZFailFunc[ctx->Stencil._BackFace];
  80.       back_pass_z_pass = ctx->Stencil.ZPassFunc[ctx->Stencil._BackFace];
  81.    } else {
  82.       front_ref = _mesa_get_stencil_ref(ctx, ctx->Stencil._BackFace);
  83.       front_mask = ctx->Stencil.ValueMask[ctx->Stencil._BackFace];
  84.       front_writemask = ctx->Stencil.WriteMask[ctx->Stencil._BackFace];
  85.       front_func = ctx->Stencil.Function[ctx->Stencil._BackFace];
  86.       front_fail = ctx->Stencil.FailFunc[ctx->Stencil._BackFace];
  87.       front_pass_z_fail = ctx->Stencil.ZFailFunc[ctx->Stencil._BackFace];
  88.       front_pass_z_pass = ctx->Stencil.ZPassFunc[ctx->Stencil._BackFace];
  89.       back_ref = _mesa_get_stencil_ref(ctx, 0);
  90.       back_mask = ctx->Stencil.ValueMask[0];
  91.       back_writemask = ctx->Stencil.WriteMask[0];
  92.       back_func = ctx->Stencil.Function[0];
  93.       back_fail = ctx->Stencil.FailFunc[0];
  94.       back_pass_z_fail = ctx->Stencil.ZFailFunc[0];
  95.       back_pass_z_pass = ctx->Stencil.ZPassFunc[0];
  96.    }
  97. #define set_ctx_bits(reg, mask, set) do{ \
  98.    GLuint dw = i915->state.Ctx[reg]; \
  99.    dw &= ~(mask); \
  100.    dw |= (set); \
  101.    dirty |= dw != i915->state.Ctx[reg]; \
  102.    i915->state.Ctx[reg] = dw; \
  103. } while(0)
  104.  
  105.    /* Set front state. */
  106.    set_ctx_bits(I915_CTXREG_STATE4,
  107.                 MODE4_ENABLE_STENCIL_TEST_MASK |
  108.                 MODE4_ENABLE_STENCIL_WRITE_MASK,
  109.                 ENABLE_STENCIL_TEST_MASK |
  110.                 ENABLE_STENCIL_WRITE_MASK |
  111.                 STENCIL_TEST_MASK(front_mask) |
  112.                 STENCIL_WRITE_MASK(front_writemask));
  113.  
  114.    set_ctx_bits(I915_CTXREG_LIS5,
  115.                 S5_STENCIL_REF_MASK |
  116.                 S5_STENCIL_TEST_FUNC_MASK |
  117.                 S5_STENCIL_FAIL_MASK |
  118.                 S5_STENCIL_PASS_Z_FAIL_MASK |
  119.                 S5_STENCIL_PASS_Z_PASS_MASK,
  120.                 (front_ref << S5_STENCIL_REF_SHIFT) |
  121.                 (intel_translate_compare_func(front_func) << S5_STENCIL_TEST_FUNC_SHIFT) |
  122.                 (intel_translate_stencil_op(front_fail) << S5_STENCIL_FAIL_SHIFT) |
  123.                 (intel_translate_stencil_op(front_pass_z_fail) <<
  124.                  S5_STENCIL_PASS_Z_FAIL_SHIFT) |
  125.                 (intel_translate_stencil_op(front_pass_z_pass) <<
  126.                  S5_STENCIL_PASS_Z_PASS_SHIFT));
  127.  
  128.    /* Set back state if different from front. */
  129.    if (ctx->Stencil._TestTwoSide) {
  130.       set_ctx_bits(I915_CTXREG_BF_STENCIL_OPS,
  131.                    BFO_STENCIL_REF_MASK |
  132.                    BFO_STENCIL_TEST_MASK |
  133.                    BFO_STENCIL_FAIL_MASK |
  134.                    BFO_STENCIL_PASS_Z_FAIL_MASK |
  135.                    BFO_STENCIL_PASS_Z_PASS_MASK,
  136.                    BFO_STENCIL_TWO_SIDE |
  137.                    (back_ref << BFO_STENCIL_REF_SHIFT) |
  138.                    (intel_translate_compare_func(back_func) << BFO_STENCIL_TEST_SHIFT) |
  139.                    (intel_translate_stencil_op(back_fail) << BFO_STENCIL_FAIL_SHIFT) |
  140.                    (intel_translate_stencil_op(back_pass_z_fail) <<
  141.                     BFO_STENCIL_PASS_Z_FAIL_SHIFT) |
  142.                    (intel_translate_stencil_op(back_pass_z_pass) <<
  143.                     BFO_STENCIL_PASS_Z_PASS_SHIFT));
  144.  
  145.       set_ctx_bits(I915_CTXREG_BF_STENCIL_MASKS,
  146.                    BFM_STENCIL_TEST_MASK_MASK |
  147.                    BFM_STENCIL_WRITE_MASK_MASK,
  148.                    BFM_STENCIL_TEST_MASK(back_mask) |
  149.                    BFM_STENCIL_WRITE_MASK(back_writemask));
  150.    } else {
  151.       set_ctx_bits(I915_CTXREG_BF_STENCIL_OPS,
  152.                    BFO_STENCIL_TWO_SIDE, 0);
  153.    }
  154.  
  155. #undef set_ctx_bits
  156.  
  157.    if (dirty)
  158.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  159. }
  160.  
  161. static void
  162. i915StencilFuncSeparate(struct gl_context * ctx, GLenum face, GLenum func, GLint ref,
  163.                         GLuint mask)
  164. {
  165. }
  166.  
  167. static void
  168. i915StencilMaskSeparate(struct gl_context * ctx, GLenum face, GLuint mask)
  169. {
  170. }
  171.  
  172. static void
  173. i915StencilOpSeparate(struct gl_context * ctx, GLenum face, GLenum fail, GLenum zfail,
  174.                       GLenum zpass)
  175. {
  176. }
  177.  
  178. static void
  179. i915AlphaFunc(struct gl_context * ctx, GLenum func, GLfloat ref)
  180. {
  181.    struct i915_context *i915 = I915_CONTEXT(ctx);
  182.    int test = intel_translate_compare_func(func);
  183.    GLubyte refByte;
  184.    GLuint dw;
  185.  
  186.    UNCLAMPED_FLOAT_TO_UBYTE(refByte, ref);
  187.  
  188.    dw = i915->state.Ctx[I915_CTXREG_LIS6];
  189.    dw &= ~(S6_ALPHA_TEST_FUNC_MASK | S6_ALPHA_REF_MASK);
  190.    dw |= ((test << S6_ALPHA_TEST_FUNC_SHIFT) |
  191.           (((GLuint) refByte) << S6_ALPHA_REF_SHIFT));
  192.    if (dw != i915->state.Ctx[I915_CTXREG_LIS6]) {
  193.       i915->state.Ctx[I915_CTXREG_LIS6] = dw;
  194.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  195.    }
  196. }
  197.  
  198. /* This function makes sure that the proper enables are
  199.  * set for LogicOp, Independant Alpha Blend, and Blending.
  200.  * It needs to be called from numerous places where we
  201.  * could change the LogicOp or Independant Alpha Blend without subsequent
  202.  * calls to glEnable.
  203.  */
  204. static void
  205. i915EvalLogicOpBlendState(struct gl_context * ctx)
  206. {
  207.    struct i915_context *i915 = I915_CONTEXT(ctx);
  208.    GLuint dw0, dw1;
  209.  
  210.    dw0 = i915->state.Ctx[I915_CTXREG_LIS5];
  211.    dw1 = i915->state.Ctx[I915_CTXREG_LIS6];
  212.  
  213.    if (ctx->Color.ColorLogicOpEnabled) {
  214.       dw0 |= S5_LOGICOP_ENABLE;
  215.       dw1 &= ~S6_CBUF_BLEND_ENABLE;
  216.    }
  217.    else {
  218.       dw0 &= ~S5_LOGICOP_ENABLE;
  219.  
  220.       if (ctx->Color.BlendEnabled) {
  221.          dw1 |= S6_CBUF_BLEND_ENABLE;
  222.       }
  223.       else {
  224.          dw1 &= ~S6_CBUF_BLEND_ENABLE;
  225.       }
  226.    }
  227.    if (dw0 != i915->state.Ctx[I915_CTXREG_LIS5] ||
  228.        dw1 != i915->state.Ctx[I915_CTXREG_LIS6]) {
  229.       i915->state.Ctx[I915_CTXREG_LIS5] = dw0;
  230.       i915->state.Ctx[I915_CTXREG_LIS6] = dw1;
  231.  
  232.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  233.    }
  234. }
  235.  
  236. static void
  237. i915BlendColor(struct gl_context * ctx, const GLfloat color[4])
  238. {
  239.    struct i915_context *i915 = I915_CONTEXT(ctx);
  240.    GLubyte r, g, b, a;
  241.    GLuint dw;
  242.  
  243.    DBG("%s\n", __FUNCTION__);
  244.    
  245.    UNCLAMPED_FLOAT_TO_UBYTE(r, color[RCOMP]);
  246.    UNCLAMPED_FLOAT_TO_UBYTE(g, color[GCOMP]);
  247.    UNCLAMPED_FLOAT_TO_UBYTE(b, color[BCOMP]);
  248.    UNCLAMPED_FLOAT_TO_UBYTE(a, color[ACOMP]);
  249.  
  250.    dw = (a << 24) | (r << 16) | (g << 8) | b;
  251.    if (dw != i915->state.Blend[I915_BLENDREG_BLENDCOLOR1]) {
  252.       i915->state.Blend[I915_BLENDREG_BLENDCOLOR1] = dw;
  253.       I915_STATECHANGE(i915, I915_UPLOAD_BLEND);
  254.    }
  255. }
  256.  
  257.  
  258. #define DST_BLND_FACT(f) ((f)<<S6_CBUF_DST_BLEND_FACT_SHIFT)
  259. #define SRC_BLND_FACT(f) ((f)<<S6_CBUF_SRC_BLEND_FACT_SHIFT)
  260. #define DST_ABLND_FACT(f) ((f)<<IAB_DST_FACTOR_SHIFT)
  261. #define SRC_ABLND_FACT(f) ((f)<<IAB_SRC_FACTOR_SHIFT)
  262.  
  263.  
  264.  
  265. static GLuint
  266. translate_blend_equation(GLenum mode)
  267. {
  268.    switch (mode) {
  269.    case GL_FUNC_ADD:
  270.       return BLENDFUNC_ADD;
  271.    case GL_MIN:
  272.       return BLENDFUNC_MIN;
  273.    case GL_MAX:
  274.       return BLENDFUNC_MAX;
  275.    case GL_FUNC_SUBTRACT:
  276.       return BLENDFUNC_SUBTRACT;
  277.    case GL_FUNC_REVERSE_SUBTRACT:
  278.       return BLENDFUNC_REVERSE_SUBTRACT;
  279.    default:
  280.       return 0;
  281.    }
  282. }
  283.  
  284. static void
  285. i915UpdateBlendState(struct gl_context * ctx)
  286. {
  287.    struct i915_context *i915 = I915_CONTEXT(ctx);
  288.    GLuint iab = (i915->state.Blend[I915_BLENDREG_IAB] &
  289.                  ~(IAB_SRC_FACTOR_MASK |
  290.                    IAB_DST_FACTOR_MASK |
  291.                    (BLENDFUNC_MASK << IAB_FUNC_SHIFT) | IAB_ENABLE));
  292.  
  293.    GLuint lis6 = (i915->state.Ctx[I915_CTXREG_LIS6] &
  294.                   ~(S6_CBUF_SRC_BLEND_FACT_MASK |
  295.                     S6_CBUF_DST_BLEND_FACT_MASK | S6_CBUF_BLEND_FUNC_MASK));
  296.  
  297.    GLuint eqRGB = ctx->Color.Blend[0].EquationRGB;
  298.    GLuint eqA = ctx->Color.Blend[0].EquationA;
  299.    GLuint srcRGB = ctx->Color.Blend[0].SrcRGB;
  300.    GLuint dstRGB = ctx->Color.Blend[0].DstRGB;
  301.    GLuint srcA = ctx->Color.Blend[0].SrcA;
  302.    GLuint dstA = ctx->Color.Blend[0].DstA;
  303.  
  304.    if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
  305.       srcRGB = dstRGB = GL_ONE;
  306.    }
  307.  
  308.    if (eqA == GL_MIN || eqA == GL_MAX) {
  309.       srcA = dstA = GL_ONE;
  310.    }
  311.  
  312.    lis6 |= SRC_BLND_FACT(intel_translate_blend_factor(srcRGB));
  313.    lis6 |= DST_BLND_FACT(intel_translate_blend_factor(dstRGB));
  314.    lis6 |= translate_blend_equation(eqRGB) << S6_CBUF_BLEND_FUNC_SHIFT;
  315.  
  316.    iab |= SRC_ABLND_FACT(intel_translate_blend_factor(srcA));
  317.    iab |= DST_ABLND_FACT(intel_translate_blend_factor(dstA));
  318.    iab |= translate_blend_equation(eqA) << IAB_FUNC_SHIFT;
  319.  
  320.    if (srcA != srcRGB || dstA != dstRGB || eqA != eqRGB)
  321.       iab |= IAB_ENABLE;
  322.  
  323.    if (iab != i915->state.Blend[I915_BLENDREG_IAB]) {
  324.       i915->state.Blend[I915_BLENDREG_IAB] = iab;
  325.       I915_STATECHANGE(i915, I915_UPLOAD_BLEND);
  326.    }
  327.    if (lis6 != i915->state.Ctx[I915_CTXREG_LIS6]) {
  328.       i915->state.Ctx[I915_CTXREG_LIS6] = lis6;
  329.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  330.    }
  331.  
  332.    /* This will catch a logicop blend equation */
  333.    i915EvalLogicOpBlendState(ctx);
  334. }
  335.  
  336.  
  337. static void
  338. i915BlendFuncSeparate(struct gl_context * ctx, GLenum srcRGB,
  339.                       GLenum dstRGB, GLenum srcA, GLenum dstA)
  340. {
  341.    i915UpdateBlendState(ctx);
  342. }
  343.  
  344.  
  345. static void
  346. i915BlendEquationSeparate(struct gl_context * ctx, GLenum eqRGB, GLenum eqA)
  347. {
  348.    i915UpdateBlendState(ctx);
  349. }
  350.  
  351.  
  352. static void
  353. i915DepthFunc(struct gl_context * ctx, GLenum func)
  354. {
  355.    struct i915_context *i915 = I915_CONTEXT(ctx);
  356.    int test = intel_translate_compare_func(func);
  357.    GLuint dw;
  358.  
  359.    DBG("%s\n", __FUNCTION__);
  360.    
  361.    dw = i915->state.Ctx[I915_CTXREG_LIS6];
  362.    dw &= ~S6_DEPTH_TEST_FUNC_MASK;
  363.    dw |= test << S6_DEPTH_TEST_FUNC_SHIFT;
  364.    if (dw != i915->state.Ctx[I915_CTXREG_LIS6]) {
  365.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  366.       i915->state.Ctx[I915_CTXREG_LIS6] = dw;
  367.    }
  368. }
  369.  
  370. static void
  371. i915DepthMask(struct gl_context * ctx, GLboolean flag)
  372. {
  373.    struct i915_context *i915 = I915_CONTEXT(ctx);
  374.    GLuint dw;
  375.  
  376.    DBG("%s flag (%d)\n", __FUNCTION__, flag);
  377.  
  378.    if (!ctx->DrawBuffer || !ctx->DrawBuffer->Visual.depthBits)
  379.       flag = false;
  380.  
  381.    dw = i915->state.Ctx[I915_CTXREG_LIS6];
  382.    if (flag && ctx->Depth.Test)
  383.       dw |= S6_DEPTH_WRITE_ENABLE;
  384.    else
  385.       dw &= ~S6_DEPTH_WRITE_ENABLE;
  386.    if (dw != i915->state.Ctx[I915_CTXREG_LIS6]) {
  387.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  388.       i915->state.Ctx[I915_CTXREG_LIS6] = dw;
  389.    }
  390. }
  391.  
  392.  
  393.  
  394. /**
  395.  * Update the viewport transformation matrix.  Depends on:
  396.  *  - viewport pos/size
  397.  *  - depthrange
  398.  *  - window pos/size or FBO size
  399.  */
  400. void
  401. intelCalcViewport(struct gl_context * ctx)
  402. {
  403.    struct intel_context *intel = intel_context(ctx);
  404.  
  405.    if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  406.       _math_matrix_viewport(&intel->ViewportMatrix,
  407.                             ctx->Viewport.X,
  408.                             ctx->DrawBuffer->Height - ctx->Viewport.Y,
  409.                             ctx->Viewport.Width,
  410.                             -ctx->Viewport.Height,
  411.                             ctx->Viewport.Near,
  412.                             ctx->Viewport.Far,
  413.                             1.0);
  414.    } else {
  415.       _math_matrix_viewport(&intel->ViewportMatrix,
  416.                             ctx->Viewport.X,
  417.                             ctx->Viewport.Y,
  418.                             ctx->Viewport.Width,
  419.                             ctx->Viewport.Height,
  420.                             ctx->Viewport.Near,
  421.                             ctx->Viewport.Far,
  422.                             1.0);
  423.    }
  424. }
  425.  
  426.  
  427. /** Called from ctx->Driver.Viewport() */
  428. static void
  429. i915Viewport(struct gl_context * ctx,
  430.               GLint x, GLint y, GLsizei width, GLsizei height)
  431. {
  432.    intelCalcViewport(ctx);
  433. }
  434.  
  435.  
  436. /** Called from ctx->Driver.DepthRange() */
  437. static void
  438. i915DepthRange(struct gl_context * ctx, GLclampd nearval, GLclampd farval)
  439. {
  440.    intelCalcViewport(ctx);
  441. }
  442.  
  443.  
  444. /* =============================================================
  445.  * Polygon stipple
  446.  *
  447.  * The i915 supports a 4x4 stipple natively, GL wants 32x32.
  448.  * Fortunately stipple is usually a repeating pattern.
  449.  */
  450. static void
  451. i915PolygonStipple(struct gl_context * ctx, const GLubyte * mask)
  452. {
  453.    struct i915_context *i915 = I915_CONTEXT(ctx);
  454.    const GLubyte *m;
  455.    GLubyte p[4];
  456.    int i, j, k;
  457.    int active = (ctx->Polygon.StippleFlag &&
  458.                  i915->intel.reduced_primitive == GL_TRIANGLES);
  459.    GLuint newMask;
  460.  
  461.    if (active) {
  462.       I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
  463.       i915->state.Stipple[I915_STPREG_ST1] &= ~ST1_ENABLE;
  464.    }
  465.  
  466.    /* Use the already unpacked stipple data from the context rather than the
  467.     * uninterpreted mask passed in.
  468.     */
  469.    mask = (const GLubyte *)ctx->PolygonStipple;
  470.    m = mask;
  471.  
  472.    p[0] = mask[12] & 0xf;
  473.    p[0] |= p[0] << 4;
  474.    p[1] = mask[8] & 0xf;
  475.    p[1] |= p[1] << 4;
  476.    p[2] = mask[4] & 0xf;
  477.    p[2] |= p[2] << 4;
  478.    p[3] = mask[0] & 0xf;
  479.    p[3] |= p[3] << 4;
  480.  
  481.    for (k = 0; k < 8; k++)
  482.       for (j = 3; j >= 0; j--)
  483.          for (i = 0; i < 4; i++, m++)
  484.             if (*m != p[j]) {
  485.                i915->intel.hw_stipple = 0;
  486.                return;
  487.             }
  488.  
  489.    newMask = (((p[0] & 0xf) << 0) |
  490.               ((p[1] & 0xf) << 4) |
  491.               ((p[2] & 0xf) << 8) | ((p[3] & 0xf) << 12));
  492.  
  493.  
  494.    if (newMask == 0xffff || newMask == 0x0) {
  495.       /* this is needed to make conform pass */
  496.       i915->intel.hw_stipple = 0;
  497.       return;
  498.    }
  499.  
  500.    i915->state.Stipple[I915_STPREG_ST1] &= ~0xffff;
  501.    i915->state.Stipple[I915_STPREG_ST1] |= newMask;
  502.    i915->intel.hw_stipple = 1;
  503.  
  504.    if (active)
  505.       i915->state.Stipple[I915_STPREG_ST1] |= ST1_ENABLE;
  506. }
  507.  
  508.  
  509. /* =============================================================
  510.  * Hardware clipping
  511.  */
  512. static void
  513. i915Scissor(struct gl_context * ctx, GLint x, GLint y, GLsizei w, GLsizei h)
  514. {
  515.    struct i915_context *i915 = I915_CONTEXT(ctx);
  516.    int x1, y1, x2, y2;
  517.  
  518.    if (!ctx->DrawBuffer)
  519.       return;
  520.  
  521.    DBG("%s %d,%d %dx%d\n", __FUNCTION__, x, y, w, h);
  522.  
  523.    if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  524.       x1 = x;
  525.       y1 = ctx->DrawBuffer->Height - (y + h);
  526.       x2 = x + w - 1;
  527.       y2 = y1 + h - 1;
  528.       DBG("%s %d..%d,%d..%d (inverted)\n", __FUNCTION__, x1, x2, y1, y2);
  529.    }
  530.    else {
  531.       /* FBO - not inverted
  532.        */
  533.       x1 = x;
  534.       y1 = y;
  535.       x2 = x + w - 1;
  536.       y2 = y + h - 1;
  537.       DBG("%s %d..%d,%d..%d (not inverted)\n", __FUNCTION__, x1, x2, y1, y2);
  538.    }
  539.    
  540.    x1 = CLAMP(x1, 0, ctx->DrawBuffer->Width - 1);
  541.    y1 = CLAMP(y1, 0, ctx->DrawBuffer->Height - 1);
  542.    x2 = CLAMP(x2, 0, ctx->DrawBuffer->Width - 1);
  543.    y2 = CLAMP(y2, 0, ctx->DrawBuffer->Height - 1);
  544.    
  545.    DBG("%s %d..%d,%d..%d (clamped)\n", __FUNCTION__, x1, x2, y1, y2);
  546.  
  547.    I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
  548.    i915->state.Buffer[I915_DESTREG_SR1] = (y1 << 16) | (x1 & 0xffff);
  549.    i915->state.Buffer[I915_DESTREG_SR2] = (y2 << 16) | (x2 & 0xffff);
  550. }
  551.  
  552. static void
  553. i915LogicOp(struct gl_context * ctx, GLenum opcode)
  554. {
  555.    struct i915_context *i915 = I915_CONTEXT(ctx);
  556.    int tmp = intel_translate_logic_op(opcode);
  557.  
  558.    DBG("%s\n", __FUNCTION__);
  559.    
  560.    I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  561.    i915->state.Ctx[I915_CTXREG_STATE4] &= ~LOGICOP_MASK;
  562.    i915->state.Ctx[I915_CTXREG_STATE4] |= LOGIC_OP_FUNC(tmp);
  563. }
  564.  
  565.  
  566.  
  567. static void
  568. i915CullFaceFrontFace(struct gl_context * ctx, GLenum unused)
  569. {
  570.    struct i915_context *i915 = I915_CONTEXT(ctx);
  571.    GLuint mode, dw;
  572.  
  573.    DBG("%s %d\n", __FUNCTION__,
  574.        ctx->DrawBuffer ? ctx->DrawBuffer->Name : 0);
  575.  
  576.    if (!ctx->Polygon.CullFlag) {
  577.       mode = S4_CULLMODE_NONE;
  578.    }
  579.    else if (ctx->Polygon.CullFaceMode != GL_FRONT_AND_BACK) {
  580.       mode = S4_CULLMODE_CW;
  581.  
  582.       if (ctx->DrawBuffer && _mesa_is_user_fbo(ctx->DrawBuffer))
  583.          mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
  584.       if (ctx->Polygon.CullFaceMode == GL_FRONT)
  585.          mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
  586.       if (ctx->Polygon.FrontFace != GL_CCW)
  587.          mode ^= (S4_CULLMODE_CW ^ S4_CULLMODE_CCW);
  588.    }
  589.    else {
  590.       mode = S4_CULLMODE_BOTH;
  591.    }
  592.  
  593.    dw = i915->state.Ctx[I915_CTXREG_LIS4];
  594.    dw &= ~S4_CULLMODE_MASK;
  595.    dw |= mode;
  596.    if (dw != i915->state.Ctx[I915_CTXREG_LIS4]) {
  597.       i915->state.Ctx[I915_CTXREG_LIS4] = dw;
  598.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  599.    }
  600. }
  601.  
  602. static void
  603. i915LineWidth(struct gl_context * ctx, GLfloat widthf)
  604. {
  605.    struct i915_context *i915 = I915_CONTEXT(ctx);
  606.    int lis4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_LINE_WIDTH_MASK;
  607.    int width;
  608.  
  609.    DBG("%s\n", __FUNCTION__);
  610.    
  611.    width = (int) (widthf * 2);
  612.    width = CLAMP(width, 1, 0xf);
  613.    lis4 |= width << S4_LINE_WIDTH_SHIFT;
  614.  
  615.    if (lis4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
  616.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  617.       i915->state.Ctx[I915_CTXREG_LIS4] = lis4;
  618.    }
  619. }
  620.  
  621. static void
  622. i915PointSize(struct gl_context * ctx, GLfloat size)
  623. {
  624.    struct i915_context *i915 = I915_CONTEXT(ctx);
  625.    int lis4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_POINT_WIDTH_MASK;
  626.    GLint point_size = (int) round(size);
  627.  
  628.    DBG("%s\n", __FUNCTION__);
  629.    
  630.    point_size = CLAMP(point_size, 1, 255);
  631.    lis4 |= point_size << S4_POINT_WIDTH_SHIFT;
  632.  
  633.    if (lis4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
  634.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  635.       i915->state.Ctx[I915_CTXREG_LIS4] = lis4;
  636.    }
  637. }
  638.  
  639.  
  640. static void
  641. i915PointParameterfv(struct gl_context * ctx, GLenum pname, const GLfloat *params)
  642. {
  643.    struct i915_context *i915 = I915_CONTEXT(ctx);
  644.  
  645.    switch (pname) {
  646.    case GL_POINT_SPRITE_COORD_ORIGIN:
  647.       /* This could be supported, but it would require modifying the fragment
  648.        * program to invert the y component of the texture coordinate by
  649.        * inserting a 'SUB tc.y, {1.0}.xxxx, tc' instruction.
  650.        */
  651.       FALLBACK(&i915->intel, I915_FALLBACK_POINT_SPRITE_COORD_ORIGIN,
  652.                (params[0] != GL_UPPER_LEFT));
  653.       break;
  654.    }
  655. }
  656.  
  657. void
  658. i915_update_sprite_point_enable(struct gl_context *ctx)
  659. {
  660.    struct intel_context *intel = intel_context(ctx);
  661.    /* _NEW_PROGRAM */
  662.    struct i915_fragment_program *p =
  663.       (struct i915_fragment_program *) ctx->FragmentProgram._Current;
  664.    const GLbitfield64 inputsRead = p->FragProg.Base.InputsRead;
  665.    struct i915_context *i915 = i915_context(ctx);
  666.    GLuint s4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_VFMT_MASK;
  667.    int i;
  668.    GLuint coord_replace_bits = 0x0;
  669.    GLuint tex_coord_unit_bits = 0x0;
  670.  
  671.    for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
  672.       /* _NEW_POINT */
  673.       if (ctx->Point.CoordReplace[i] && ctx->Point.PointSprite)
  674.          coord_replace_bits |= (1 << i);
  675.       if (inputsRead & VARYING_BIT_TEX(i))
  676.          tex_coord_unit_bits |= (1 << i);
  677.    }
  678.  
  679.    /*
  680.     * Here we can't enable the SPRITE_POINT_ENABLE bit when the mis-match
  681.     * of tex_coord_unit_bits and coord_replace_bits, or this will make all
  682.     * the other non-point-sprite coords(like varying inputs, as we now use
  683.     * tex coord to implement varying inputs) be replaced to value (0, 0)-(1, 1).
  684.     *
  685.     * Thus, do fallback when needed.
  686.     */
  687.    FALLBACK(intel, I915_FALLBACK_COORD_REPLACE,
  688.             coord_replace_bits && coord_replace_bits != tex_coord_unit_bits);
  689.  
  690.    s4 &= ~S4_SPRITE_POINT_ENABLE;
  691.    s4 |= (coord_replace_bits && coord_replace_bits == tex_coord_unit_bits) ?
  692.          S4_SPRITE_POINT_ENABLE : 0;
  693.    if (s4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
  694.       i915->state.Ctx[I915_CTXREG_LIS4] = s4;
  695.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  696.    }
  697. }
  698.  
  699.  
  700. /* =============================================================
  701.  * Color masks
  702.  */
  703.  
  704. static void
  705. i915ColorMask(struct gl_context * ctx,
  706.               GLboolean r, GLboolean g, GLboolean b, GLboolean a)
  707. {
  708.    struct i915_context *i915 = I915_CONTEXT(ctx);
  709.    GLuint tmp = i915->state.Ctx[I915_CTXREG_LIS5] & ~S5_WRITEDISABLE_MASK;
  710.  
  711.    DBG("%s r(%d) g(%d) b(%d) a(%d)\n", __FUNCTION__, r, g, b,
  712.        a);
  713.  
  714.    if (!r)
  715.       tmp |= S5_WRITEDISABLE_RED;
  716.    if (!g)
  717.       tmp |= S5_WRITEDISABLE_GREEN;
  718.    if (!b)
  719.       tmp |= S5_WRITEDISABLE_BLUE;
  720.    if (!a)
  721.       tmp |= S5_WRITEDISABLE_ALPHA;
  722.  
  723.    if (tmp != i915->state.Ctx[I915_CTXREG_LIS5]) {
  724.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  725.       i915->state.Ctx[I915_CTXREG_LIS5] = tmp;
  726.    }
  727. }
  728.  
  729. static void
  730. update_specular(struct gl_context * ctx)
  731. {
  732.    /* A hack to trigger the rebuild of the fragment program.
  733.     */
  734.    intel_context(ctx)->NewGLState |= _NEW_TEXTURE;
  735. }
  736.  
  737. static void
  738. i915LightModelfv(struct gl_context * ctx, GLenum pname, const GLfloat * param)
  739. {
  740.    DBG("%s\n", __FUNCTION__);
  741.    
  742.    if (pname == GL_LIGHT_MODEL_COLOR_CONTROL) {
  743.       update_specular(ctx);
  744.    }
  745. }
  746.  
  747. static void
  748. i915ShadeModel(struct gl_context * ctx, GLenum mode)
  749. {
  750.    struct i915_context *i915 = I915_CONTEXT(ctx);
  751.    I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  752.  
  753.    if (mode == GL_SMOOTH) {
  754.       i915->state.Ctx[I915_CTXREG_LIS4] &= ~(S4_FLATSHADE_ALPHA |
  755.                                              S4_FLATSHADE_COLOR |
  756.                                              S4_FLATSHADE_SPECULAR);
  757.    }
  758.    else {
  759.       i915->state.Ctx[I915_CTXREG_LIS4] |= (S4_FLATSHADE_ALPHA |
  760.                                             S4_FLATSHADE_COLOR |
  761.                                             S4_FLATSHADE_SPECULAR);
  762.    }
  763. }
  764.  
  765. /* =============================================================
  766.  * Fog
  767.  *
  768.  * This empty function remains because _mesa_init_driver_state calls
  769.  * dd_function_table::Fogfv unconditionally.  We have to have some function
  770.  * there so that it doesn't try to call a NULL pointer.
  771.  */
  772. static void
  773. i915Fogfv(struct gl_context * ctx, GLenum pname, const GLfloat * param)
  774. {
  775.    (void) ctx;
  776.    (void) pname;
  777.    (void) param;
  778. }
  779.  
  780. /* =============================================================
  781.  */
  782.  
  783. static void
  784. i915Enable(struct gl_context * ctx, GLenum cap, GLboolean state)
  785. {
  786.    struct i915_context *i915 = I915_CONTEXT(ctx);
  787.    GLuint dw;
  788.  
  789.    switch (cap) {
  790.    case GL_TEXTURE_2D:
  791.       break;
  792.  
  793.    case GL_LIGHTING:
  794.    case GL_COLOR_SUM:
  795.       update_specular(ctx);
  796.       break;
  797.  
  798.    case GL_ALPHA_TEST:
  799.       dw = i915->state.Ctx[I915_CTXREG_LIS6];
  800.       if (state)
  801.          dw |= S6_ALPHA_TEST_ENABLE;
  802.       else
  803.          dw &= ~S6_ALPHA_TEST_ENABLE;
  804.       if (dw != i915->state.Ctx[I915_CTXREG_LIS6]) {
  805.          i915->state.Ctx[I915_CTXREG_LIS6] = dw;
  806.          I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  807.       }
  808.       break;
  809.  
  810.    case GL_BLEND:
  811.       i915EvalLogicOpBlendState(ctx);
  812.       break;
  813.  
  814.    case GL_COLOR_LOGIC_OP:
  815.       i915EvalLogicOpBlendState(ctx);
  816.  
  817.       /* Logicop doesn't seem to work at 16bpp:
  818.        */
  819.       if (ctx->Visual.rgbBits == 16)
  820.          FALLBACK(&i915->intel, I915_FALLBACK_LOGICOP, state);
  821.       break;
  822.  
  823.    case GL_FRAGMENT_PROGRAM_ARB:
  824.       break;
  825.  
  826.    case GL_DITHER:
  827.       dw = i915->state.Ctx[I915_CTXREG_LIS5];
  828.       if (state)
  829.          dw |= S5_COLOR_DITHER_ENABLE;
  830.       else
  831.          dw &= ~S5_COLOR_DITHER_ENABLE;
  832.       if (dw != i915->state.Ctx[I915_CTXREG_LIS5]) {
  833.          i915->state.Ctx[I915_CTXREG_LIS5] = dw;
  834.          I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  835.       }
  836.       break;
  837.  
  838.    case GL_DEPTH_TEST:
  839.       dw = i915->state.Ctx[I915_CTXREG_LIS6];
  840.  
  841.       if (!ctx->DrawBuffer || !ctx->DrawBuffer->Visual.depthBits)
  842.          state = false;
  843.  
  844.       if (state)
  845.          dw |= S6_DEPTH_TEST_ENABLE;
  846.       else
  847.          dw &= ~S6_DEPTH_TEST_ENABLE;
  848.       if (dw != i915->state.Ctx[I915_CTXREG_LIS6]) {
  849.          i915->state.Ctx[I915_CTXREG_LIS6] = dw;
  850.          I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  851.       }
  852.  
  853.       i915DepthMask(ctx, ctx->Depth.Mask);
  854.       break;
  855.  
  856.    case GL_SCISSOR_TEST:
  857.       I915_STATECHANGE(i915, I915_UPLOAD_BUFFERS);
  858.       if (state)
  859.          i915->state.Buffer[I915_DESTREG_SENABLE] =
  860.             (_3DSTATE_SCISSOR_ENABLE_CMD | ENABLE_SCISSOR_RECT);
  861.       else
  862.          i915->state.Buffer[I915_DESTREG_SENABLE] =
  863.             (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
  864.       break;
  865.  
  866.    case GL_LINE_SMOOTH:
  867.       dw = i915->state.Ctx[I915_CTXREG_LIS4];
  868.       if (state)
  869.          dw |= S4_LINE_ANTIALIAS_ENABLE;
  870.       else
  871.          dw &= ~S4_LINE_ANTIALIAS_ENABLE;
  872.       if (dw != i915->state.Ctx[I915_CTXREG_LIS4]) {
  873.          i915->state.Ctx[I915_CTXREG_LIS4] = dw;
  874.          I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  875.       }
  876.       break;
  877.  
  878.    case GL_CULL_FACE:
  879.       i915CullFaceFrontFace(ctx, 0);
  880.       break;
  881.  
  882.    case GL_STENCIL_TEST:
  883.       if (!ctx->DrawBuffer || !ctx->DrawBuffer->Visual.stencilBits)
  884.          state = false;
  885.  
  886.       dw = i915->state.Ctx[I915_CTXREG_LIS5];
  887.       if (state)
  888.          dw |= (S5_STENCIL_TEST_ENABLE | S5_STENCIL_WRITE_ENABLE);
  889.       else
  890.          dw &= ~(S5_STENCIL_TEST_ENABLE | S5_STENCIL_WRITE_ENABLE);
  891.       if (dw != i915->state.Ctx[I915_CTXREG_LIS5]) {
  892.          i915->state.Ctx[I915_CTXREG_LIS5] = dw;
  893.          I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  894.       }
  895.       break;
  896.  
  897.    case GL_POLYGON_STIPPLE:
  898.       /* The stipple command worked on my 855GM box, but not my 845G.
  899.        * I'll do more testing later to find out exactly which hardware
  900.        * supports it.  Disabled for now.
  901.        */
  902.       if (i915->intel.hw_stipple &&
  903.           i915->intel.reduced_primitive == GL_TRIANGLES) {
  904.          I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
  905.          if (state)
  906.             i915->state.Stipple[I915_STPREG_ST1] |= ST1_ENABLE;
  907.          else
  908.             i915->state.Stipple[I915_STPREG_ST1] &= ~ST1_ENABLE;
  909.       }
  910.       break;
  911.  
  912.    case GL_POLYGON_SMOOTH:
  913.       break;
  914.  
  915.    case GL_POINT_SPRITE:
  916.       /* Handle it at i915_update_sprite_point_enable () */
  917.       break;
  918.  
  919.    case GL_POINT_SMOOTH:
  920.       break;
  921.  
  922.    default:
  923.       ;
  924.    }
  925. }
  926.  
  927.  
  928. static void
  929. i915_init_packets(struct i915_context *i915)
  930. {
  931.    /* Zero all state */
  932.    memset(&i915->state, 0, sizeof(i915->state));
  933.  
  934.  
  935.    {
  936.       I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  937.       I915_STATECHANGE(i915, I915_UPLOAD_BLEND);
  938.       /* Probably don't want to upload all this stuff every time one
  939.        * piece changes.
  940.        */
  941.       i915->state.Ctx[I915_CTXREG_LI] = (_3DSTATE_LOAD_STATE_IMMEDIATE_1 |
  942.                                          I1_LOAD_S(2) |
  943.                                          I1_LOAD_S(4) |
  944.                                          I1_LOAD_S(5) | I1_LOAD_S(6) | (3));
  945.       i915->state.Ctx[I915_CTXREG_LIS2] = 0;
  946.       i915->state.Ctx[I915_CTXREG_LIS4] = 0;
  947.       i915->state.Ctx[I915_CTXREG_LIS5] = 0;
  948.  
  949.       if (i915->intel.ctx.Visual.rgbBits == 16)
  950.          i915->state.Ctx[I915_CTXREG_LIS5] |= S5_COLOR_DITHER_ENABLE;
  951.  
  952.  
  953.       i915->state.Ctx[I915_CTXREG_LIS6] = (S6_COLOR_WRITE_ENABLE |
  954.                                            (2 << S6_TRISTRIP_PV_SHIFT));
  955.  
  956.       i915->state.Ctx[I915_CTXREG_STATE4] = (_3DSTATE_MODES_4_CMD |
  957.                                              ENABLE_LOGIC_OP_FUNC |
  958.                                              LOGIC_OP_FUNC(LOGICOP_COPY) |
  959.                                              ENABLE_STENCIL_TEST_MASK |
  960.                                              STENCIL_TEST_MASK(0xff) |
  961.                                              ENABLE_STENCIL_WRITE_MASK |
  962.                                              STENCIL_WRITE_MASK(0xff));
  963.  
  964.       i915->state.Blend[I915_BLENDREG_IAB] =
  965.          (_3DSTATE_INDEPENDENT_ALPHA_BLEND_CMD | IAB_MODIFY_ENABLE |
  966.           IAB_MODIFY_FUNC | IAB_MODIFY_SRC_FACTOR | IAB_MODIFY_DST_FACTOR);
  967.  
  968.       i915->state.Blend[I915_BLENDREG_BLENDCOLOR0] =
  969.          _3DSTATE_CONST_BLEND_COLOR_CMD;
  970.       i915->state.Blend[I915_BLENDREG_BLENDCOLOR1] = 0;
  971.  
  972.       i915->state.Ctx[I915_CTXREG_BF_STENCIL_MASKS] =
  973.          _3DSTATE_BACKFACE_STENCIL_MASKS |
  974.          BFM_ENABLE_STENCIL_TEST_MASK |
  975.          BFM_ENABLE_STENCIL_WRITE_MASK |
  976.          (0xff << BFM_STENCIL_WRITE_MASK_SHIFT) |
  977.          (0xff << BFM_STENCIL_TEST_MASK_SHIFT);
  978.       i915->state.Ctx[I915_CTXREG_BF_STENCIL_OPS] =
  979.          _3DSTATE_BACKFACE_STENCIL_OPS |
  980.          BFO_ENABLE_STENCIL_REF |
  981.          BFO_ENABLE_STENCIL_FUNCS |
  982.          BFO_ENABLE_STENCIL_TWO_SIDE;
  983.    }
  984.  
  985.    {
  986.       I915_STATECHANGE(i915, I915_UPLOAD_STIPPLE);
  987.       i915->state.Stipple[I915_STPREG_ST0] = _3DSTATE_STIPPLE;
  988.    }
  989.  
  990.    {
  991.       i915->state.Buffer[I915_DESTREG_DV0] = _3DSTATE_DST_BUF_VARS_CMD;
  992.  
  993.       /* scissor */
  994.       i915->state.Buffer[I915_DESTREG_SENABLE] =
  995.          (_3DSTATE_SCISSOR_ENABLE_CMD | DISABLE_SCISSOR_RECT);
  996.       i915->state.Buffer[I915_DESTREG_SR0] = _3DSTATE_SCISSOR_RECT_0_CMD;
  997.       i915->state.Buffer[I915_DESTREG_SR1] = 0;
  998.       i915->state.Buffer[I915_DESTREG_SR2] = 0;
  999.    }
  1000.  
  1001.    i915->state.RasterRules[I915_RASTER_RULES] = _3DSTATE_RASTER_RULES_CMD |
  1002.       ENABLE_POINT_RASTER_RULE |
  1003.       OGL_POINT_RASTER_RULE |
  1004.       ENABLE_LINE_STRIP_PROVOKE_VRTX |
  1005.       ENABLE_TRI_FAN_PROVOKE_VRTX |
  1006.       LINE_STRIP_PROVOKE_VRTX(1) |
  1007.       TRI_FAN_PROVOKE_VRTX(2) | ENABLE_TEXKILL_3D_4D | TEXKILL_4D;
  1008.  
  1009. #if 0
  1010.    {
  1011.       I915_STATECHANGE(i915, I915_UPLOAD_DEFAULTS);
  1012.       i915->state.Default[I915_DEFREG_C0] = _3DSTATE_DEFAULT_DIFFUSE;
  1013.       i915->state.Default[I915_DEFREG_C1] = 0;
  1014.       i915->state.Default[I915_DEFREG_S0] = _3DSTATE_DEFAULT_SPECULAR;
  1015.       i915->state.Default[I915_DEFREG_S1] = 0;
  1016.       i915->state.Default[I915_DEFREG_Z0] = _3DSTATE_DEFAULT_Z;
  1017.       i915->state.Default[I915_DEFREG_Z1] = 0;
  1018.    }
  1019. #endif
  1020.  
  1021.  
  1022.    /* These will be emitted every at the head of every buffer, unless
  1023.     * we get hardware contexts working.
  1024.     */
  1025.    i915->state.active = (I915_UPLOAD_PROGRAM |
  1026.                          I915_UPLOAD_STIPPLE |
  1027.                          I915_UPLOAD_CTX |
  1028.                          I915_UPLOAD_BLEND |
  1029.                          I915_UPLOAD_BUFFERS |
  1030.                          I915_UPLOAD_INVARIENT |
  1031.                          I915_UPLOAD_RASTER_RULES);
  1032. }
  1033.  
  1034. void
  1035. i915_update_provoking_vertex(struct gl_context * ctx)
  1036. {
  1037.    struct i915_context *i915 = I915_CONTEXT(ctx);
  1038.  
  1039.    I915_STATECHANGE(i915, I915_UPLOAD_CTX);
  1040.    i915->state.Ctx[I915_CTXREG_LIS6] &= ~(S6_TRISTRIP_PV_MASK);
  1041.  
  1042.    I915_STATECHANGE(i915, I915_UPLOAD_RASTER_RULES);
  1043.    i915->state.RasterRules[I915_RASTER_RULES] &= ~(LINE_STRIP_PROVOKE_VRTX_MASK |
  1044.                                                    TRI_FAN_PROVOKE_VRTX_MASK);
  1045.  
  1046.    /* _NEW_LIGHT */
  1047.    if (ctx->Light.ProvokingVertex == GL_LAST_VERTEX_CONVENTION) {
  1048.       i915->state.RasterRules[I915_RASTER_RULES] |= (LINE_STRIP_PROVOKE_VRTX(1) |
  1049.                                                      TRI_FAN_PROVOKE_VRTX(2));
  1050.       i915->state.Ctx[I915_CTXREG_LIS6] |= (2 << S6_TRISTRIP_PV_SHIFT);
  1051.    } else {
  1052.       i915->state.RasterRules[I915_RASTER_RULES] |= (LINE_STRIP_PROVOKE_VRTX(0) |
  1053.                                                      TRI_FAN_PROVOKE_VRTX(1));
  1054.       i915->state.Ctx[I915_CTXREG_LIS6] |= (0 << S6_TRISTRIP_PV_SHIFT);
  1055.     }
  1056. }
  1057.  
  1058. /* Fallback to swrast for select and feedback.
  1059.  */
  1060. static void
  1061. i915RenderMode(struct gl_context *ctx, GLenum mode)
  1062. {
  1063.    struct intel_context *intel = intel_context(ctx);
  1064.    FALLBACK(intel, INTEL_FALLBACK_RENDERMODE, (mode != GL_RENDER));
  1065. }
  1066.  
  1067. void
  1068. i915InitStateFunctions(struct dd_function_table *functions)
  1069. {
  1070.    functions->AlphaFunc = i915AlphaFunc;
  1071.    functions->BlendColor = i915BlendColor;
  1072.    functions->BlendEquationSeparate = i915BlendEquationSeparate;
  1073.    functions->BlendFuncSeparate = i915BlendFuncSeparate;
  1074.    functions->ColorMask = i915ColorMask;
  1075.    functions->CullFace = i915CullFaceFrontFace;
  1076.    functions->DepthFunc = i915DepthFunc;
  1077.    functions->DepthMask = i915DepthMask;
  1078.    functions->Enable = i915Enable;
  1079.    functions->Fogfv = i915Fogfv;
  1080.    functions->FrontFace = i915CullFaceFrontFace;
  1081.    functions->LightModelfv = i915LightModelfv;
  1082.    functions->LineWidth = i915LineWidth;
  1083.    functions->LogicOpcode = i915LogicOp;
  1084.    functions->PointSize = i915PointSize;
  1085.    functions->PointParameterfv = i915PointParameterfv;
  1086.    functions->PolygonStipple = i915PolygonStipple;
  1087.    functions->RenderMode = i915RenderMode;
  1088.    functions->Scissor = i915Scissor;
  1089.    functions->ShadeModel = i915ShadeModel;
  1090.    functions->StencilFuncSeparate = i915StencilFuncSeparate;
  1091.    functions->StencilMaskSeparate = i915StencilMaskSeparate;
  1092.    functions->StencilOpSeparate = i915StencilOpSeparate;
  1093.    functions->DepthRange = i915DepthRange;
  1094.    functions->Viewport = i915Viewport;
  1095. }
  1096.  
  1097.  
  1098. void
  1099. i915InitState(struct i915_context *i915)
  1100. {
  1101.    struct gl_context *ctx = &i915->intel.ctx;
  1102.  
  1103.    i915_init_packets(i915);
  1104.  
  1105.    _mesa_init_driver_state(ctx);
  1106. }
  1107.