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  1. /*
  2.  * Copyright © 2011 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  */
  23.  
  24. #include "brw_context.h"
  25. #include "brw_state.h"
  26. #include "brw_defines.h"
  27. #include "brw_util.h"
  28. #include "intel_batchbuffer.h"
  29. #include "main/fbobject.h"
  30.  
  31. static void
  32. upload_clip_state(struct brw_context *brw)
  33. {
  34.    struct gl_context *ctx = &brw->ctx;
  35.    uint32_t dw1 = 0, dw2 = 0;
  36.  
  37.    /* _NEW_BUFFERS */
  38.    struct gl_framebuffer *fb = ctx->DrawBuffer;
  39.    bool render_to_fbo = _mesa_is_user_fbo(fb);
  40.  
  41.    /* BRW_NEW_META_IN_PROGRESS */
  42.    if (!brw->meta_in_progress)
  43.       dw1 |= GEN6_CLIP_STATISTICS_ENABLE;
  44.  
  45.    /* CACHE_NEW_WM_PROG */
  46.    if (brw->wm.prog_data->barycentric_interp_modes &
  47.        BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS) {
  48.       dw2 |= GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE;
  49.    }
  50.  
  51.    dw1 |= GEN7_CLIP_EARLY_CULL;
  52.  
  53.    /* _NEW_POLYGON */
  54.    if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
  55.       dw1 |= GEN7_CLIP_WINDING_CCW;
  56.  
  57.    if (ctx->Polygon.CullFlag) {
  58.       switch (ctx->Polygon.CullFaceMode) {
  59.       case GL_FRONT:
  60.          dw1 |= GEN7_CLIP_CULLMODE_FRONT;
  61.          break;
  62.       case GL_BACK:
  63.          dw1 |= GEN7_CLIP_CULLMODE_BACK;
  64.          break;
  65.       case GL_FRONT_AND_BACK:
  66.          dw1 |= GEN7_CLIP_CULLMODE_BOTH;
  67.          break;
  68.       default:
  69.          assert(!"Should not get here: invalid CullFlag");
  70.          break;
  71.       }
  72.    } else {
  73.       dw1 |= GEN7_CLIP_CULLMODE_NONE;
  74.    }
  75.  
  76.    /* _NEW_TRANSFORM */
  77.    if (!ctx->Transform.DepthClamp)
  78.       dw2 |= GEN6_CLIP_Z_TEST;
  79.  
  80.    /* _NEW_LIGHT */
  81.    if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
  82.       dw2 |=
  83.          (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
  84.          (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
  85.          (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
  86.    } else {
  87.       dw2 |=
  88.          (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
  89.          (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
  90.          (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
  91.    }
  92.  
  93.    /* _NEW_TRANSFORM */
  94.    dw2 |= (ctx->Transform.ClipPlanesEnabled <<
  95.            GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT);
  96.  
  97.    if (ctx->Viewport.X == 0 &&
  98.        ctx->Viewport.Y == 0 &&
  99.        ctx->Viewport.Width == fb->Width &&
  100.        ctx->Viewport.Height == fb->Height) {
  101.       dw2 |= GEN6_CLIP_GB_TEST;
  102.    }
  103.  
  104.    /* BRW_NEW_RASTERIZER_DISCARD */
  105.    if (ctx->RasterDiscard) {
  106.       dw2 |= GEN6_CLIP_MODE_REJECT_ALL;
  107.       perf_debug("Rasterizer discard is currently implemented via the clipper; "
  108.                  "using the SOL unit may be faster.");
  109.    }
  110.  
  111.    BEGIN_BATCH(4);
  112.    OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
  113.    OUT_BATCH(dw1);
  114.    OUT_BATCH(GEN6_CLIP_ENABLE |
  115.              GEN6_CLIP_API_OGL |
  116.              GEN6_CLIP_MODE_NORMAL |
  117.              GEN6_CLIP_XY_TEST |
  118.              dw2);
  119.    OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
  120.              U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
  121.              GEN6_CLIP_FORCE_ZERO_RTAINDEX);
  122.    ADVANCE_BATCH();
  123. }
  124.  
  125. const struct brw_tracked_state gen7_clip_state = {
  126.    .dirty = {
  127.       .mesa  = (_NEW_BUFFERS |
  128.                 _NEW_POLYGON |
  129.                 _NEW_LIGHT |
  130.                 _NEW_TRANSFORM),
  131.       .brw   = BRW_NEW_CONTEXT |
  132.                BRW_NEW_META_IN_PROGRESS |
  133.                BRW_NEW_RASTERIZER_DISCARD,
  134.       .cache = CACHE_NEW_WM_PROG
  135.    },
  136.    .emit = upload_clip_state,
  137. };
  138.