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  1. /*
  2.  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
  3.  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
  4.  develop this 3D driver.
  5.  
  6.  Permission is hereby granted, free of charge, to any person obtaining
  7.  a 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, sublicense, 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
  16.  portions of the Software.
  17.  
  18.  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19.  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21.  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22.  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23.  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24.  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  
  26.  **********************************************************************/
  27.  /*
  28.   * Authors:
  29.   *   Keith Whitwell <keith@tungstengraphics.com>
  30.   */
  31.  
  32. #include "main/glheader.h"
  33. #include "main/macros.h"
  34. #include "main/enums.h"
  35.  
  36. #include "intel_batchbuffer.h"
  37.  
  38. #include "brw_defines.h"
  39. #include "brw_context.h"
  40. #include "brw_eu.h"
  41. #include "brw_util.h"
  42. #include "brw_state.h"
  43. #include "brw_clip.h"
  44.  
  45. #include "glsl/ralloc.h"
  46.  
  47. #define FRONT_UNFILLED_BIT  0x1
  48. #define BACK_UNFILLED_BIT   0x2
  49.  
  50.  
  51. static void compile_clip_prog( struct brw_context *brw,
  52.                              struct brw_clip_prog_key *key )
  53. {
  54.    struct brw_clip_compile c;
  55.    const GLuint *program;
  56.    void *mem_ctx;
  57.    GLuint program_size;
  58.    GLuint i;
  59.  
  60.    memset(&c, 0, sizeof(c));
  61.  
  62.    mem_ctx = ralloc_context(NULL);
  63.    
  64.    /* Begin the compilation:
  65.     */
  66.    brw_init_compile(brw, &c.func, mem_ctx);
  67.  
  68.    c.func.single_program_flow = 1;
  69.  
  70.    c.key = *key;
  71.    c.vue_map = brw->vue_map_geom_out;
  72.  
  73.    /* nr_regs is the number of registers filled by reading data from the VUE.
  74.     * This program accesses the entire VUE, so nr_regs needs to be the size of
  75.     * the VUE (measured in pairs, since two slots are stored in each
  76.     * register).
  77.     */
  78.    c.nr_regs = (c.vue_map.num_slots + 1)/2;
  79.  
  80.    c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
  81.  
  82.    /* For some reason the thread is spawned with only 4 channels
  83.     * unmasked.  
  84.     */
  85.    brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
  86.  
  87.  
  88.    /* Would ideally have the option of producing a program which could
  89.     * do all three:
  90.     */
  91.    switch (key->primitive) {
  92.    case GL_TRIANGLES:
  93.       if (key->do_unfilled)
  94.          brw_emit_unfilled_clip( &c );
  95.       else
  96.          brw_emit_tri_clip( &c );
  97.       break;
  98.    case GL_LINES:
  99.       brw_emit_line_clip( &c );
  100.       break;
  101.    case GL_POINTS:
  102.       brw_emit_point_clip( &c );
  103.       break;
  104.    default:
  105.       assert(0);
  106.       return;
  107.    }
  108.  
  109.          
  110.  
  111.    /* get the program
  112.     */
  113.    program = brw_get_program(&c.func, &program_size);
  114.  
  115.    if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
  116.       printf("clip:\n");
  117.       for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
  118.          brw_disasm(stdout, &((struct brw_instruction *)program)[i],
  119.                     brw->gen);
  120.       printf("\n");
  121.    }
  122.  
  123.    brw_upload_cache(&brw->cache,
  124.                     BRW_CLIP_PROG,
  125.                     &c.key, sizeof(c.key),
  126.                     program, program_size,
  127.                     &c.prog_data, sizeof(c.prog_data),
  128.                     &brw->clip.prog_offset, &brw->clip.prog_data);
  129.    ralloc_free(mem_ctx);
  130. }
  131.  
  132. /* Calculate interpolants for triangle and line rasterization.
  133.  */
  134. static void
  135. brw_upload_clip_prog(struct brw_context *brw)
  136. {
  137.    struct gl_context *ctx = &brw->ctx;
  138.    struct brw_clip_prog_key key;
  139.  
  140.    memset(&key, 0, sizeof(key));
  141.  
  142.    /* Populate the key:
  143.     */
  144.    /* BRW_NEW_REDUCED_PRIMITIVE */
  145.    key.primitive = brw->reduced_primitive;
  146.    /* BRW_NEW_VUE_MAP_GEOM_OUT */
  147.    key.attrs = brw->vue_map_geom_out.slots_valid;
  148.    /* _NEW_LIGHT */
  149.    key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
  150.    key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
  151.    /* _NEW_TRANSFORM (also part of VUE map)*/
  152.    key.nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
  153.  
  154.    if (brw->gen == 5)
  155.        key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
  156.    else
  157.        key.clip_mode = BRW_CLIPMODE_NORMAL;
  158.  
  159.    /* _NEW_POLYGON */
  160.    if (key.primitive == GL_TRIANGLES) {
  161.       if (ctx->Polygon.CullFlag &&
  162.           ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
  163.          key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
  164.       else {
  165.          GLuint fill_front = CLIP_CULL;
  166.          GLuint fill_back = CLIP_CULL;
  167.          GLuint offset_front = 0;
  168.          GLuint offset_back = 0;
  169.  
  170.          if (!ctx->Polygon.CullFlag ||
  171.              ctx->Polygon.CullFaceMode != GL_FRONT) {
  172.             switch (ctx->Polygon.FrontMode) {
  173.             case GL_FILL:
  174.                fill_front = CLIP_FILL;
  175.                offset_front = 0;
  176.                break;
  177.             case GL_LINE:
  178.                fill_front = CLIP_LINE;
  179.                offset_front = ctx->Polygon.OffsetLine;
  180.                break;
  181.             case GL_POINT:
  182.                fill_front = CLIP_POINT;
  183.                offset_front = ctx->Polygon.OffsetPoint;
  184.                break;
  185.             }
  186.          }
  187.  
  188.          if (!ctx->Polygon.CullFlag ||
  189.              ctx->Polygon.CullFaceMode != GL_BACK) {
  190.             switch (ctx->Polygon.BackMode) {
  191.             case GL_FILL:
  192.                fill_back = CLIP_FILL;
  193.                offset_back = 0;
  194.                break;
  195.             case GL_LINE:
  196.                fill_back = CLIP_LINE;
  197.                offset_back = ctx->Polygon.OffsetLine;
  198.                break;
  199.             case GL_POINT:
  200.                fill_back = CLIP_POINT;
  201.                offset_back = ctx->Polygon.OffsetPoint;
  202.                break;
  203.             }
  204.          }
  205.  
  206.          if (ctx->Polygon.BackMode != GL_FILL ||
  207.              ctx->Polygon.FrontMode != GL_FILL) {
  208.             key.do_unfilled = 1;
  209.  
  210.             /* Most cases the fixed function units will handle.  Cases where
  211.              * one or more polygon faces are unfilled will require help:
  212.              */
  213.             key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
  214.  
  215.             if (offset_back || offset_front) {
  216.                /* _NEW_POLYGON, _NEW_BUFFERS */
  217.                key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
  218.                key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
  219.             }
  220.  
  221.             switch (ctx->Polygon.FrontFace) {
  222.             case GL_CCW:
  223.                key.fill_ccw = fill_front;
  224.                key.fill_cw = fill_back;
  225.                key.offset_ccw = offset_front;
  226.                key.offset_cw = offset_back;
  227.                if (ctx->Light.Model.TwoSide &&
  228.                    key.fill_cw != CLIP_CULL)
  229.                   key.copy_bfc_cw = 1;
  230.                break;
  231.             case GL_CW:
  232.                key.fill_cw = fill_front;
  233.                key.fill_ccw = fill_back;
  234.                key.offset_cw = offset_front;
  235.                key.offset_ccw = offset_back;
  236.                if (ctx->Light.Model.TwoSide &&
  237.                    key.fill_ccw != CLIP_CULL)
  238.                   key.copy_bfc_ccw = 1;
  239.                break;
  240.             }
  241.          }
  242.       }
  243.    }
  244.  
  245.    if (!brw_search_cache(&brw->cache, BRW_CLIP_PROG,
  246.                          &key, sizeof(key),
  247.                          &brw->clip.prog_offset, &brw->clip.prog_data)) {
  248.       compile_clip_prog( brw, &key );
  249.    }
  250. }
  251.  
  252.  
  253. const struct brw_tracked_state brw_clip_prog = {
  254.    .dirty = {
  255.       .mesa  = (_NEW_LIGHT |
  256.                 _NEW_TRANSFORM |
  257.                 _NEW_POLYGON |
  258.                 _NEW_BUFFERS),
  259.       .brw   = (BRW_NEW_REDUCED_PRIMITIVE | BRW_NEW_VUE_MAP_GEOM_OUT)
  260.    },
  261.    .emit = brw_upload_clip_prog
  262. };
  263.