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  1. /*
  2.  * Copyright © 2009 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.  * Authors:
  24.  *    Eric Anholt <eric@anholt.net>
  25.  *
  26.  */
  27.  
  28. #include "brw_context.h"
  29. #include "brw_state.h"
  30. #include "brw_defines.h"
  31. #include "brw_util.h"
  32. #include "intel_batchbuffer.h"
  33. #include "main/fbobject.h"
  34.  
  35. static void
  36. upload_clip_state(struct brw_context *brw)
  37. {
  38.    struct gl_context *ctx = &brw->ctx;
  39.    uint32_t dw1 = brw->meta_in_progress ? 0 : GEN6_CLIP_STATISTICS_ENABLE;
  40.    uint32_t dw2 = 0;
  41.  
  42.    /* _NEW_BUFFERS */
  43.    struct gl_framebuffer *fb = ctx->DrawBuffer;
  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.    if (!ctx->Transform.DepthClamp)
  52.       dw2 |= GEN6_CLIP_Z_TEST;
  53.  
  54.    /* _NEW_LIGHT */
  55.    if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
  56.       dw2 |=
  57.          (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
  58.          (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
  59.          (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
  60.    } else {
  61.       dw2 |=
  62.          (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
  63.          (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
  64.          (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
  65.    }
  66.  
  67.    /* _NEW_TRANSFORM */
  68.    dw2 |= (ctx->Transform.ClipPlanesEnabled <<
  69.            GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT);
  70.  
  71.    if (ctx->Viewport.X == 0 &&
  72.        ctx->Viewport.Y == 0 &&
  73.        ctx->Viewport.Width == fb->Width &&
  74.        ctx->Viewport.Height == fb->Height) {
  75.       dw2 |= GEN6_CLIP_GB_TEST;
  76.    }
  77.  
  78.    /* BRW_NEW_RASTERIZER_DISCARD */
  79.    if (ctx->RasterDiscard) {
  80.       dw2 |= GEN6_CLIP_MODE_REJECT_ALL;
  81.       perf_debug("Rasterizer discard is currently implemented via the clipper; "
  82.                  "having the GS not write primitives would likely be faster.");
  83.    }
  84.  
  85.    BEGIN_BATCH(4);
  86.    OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
  87.    OUT_BATCH(dw1);
  88.    OUT_BATCH(GEN6_CLIP_ENABLE |
  89.              GEN6_CLIP_API_OGL |
  90.              GEN6_CLIP_MODE_NORMAL |
  91.              GEN6_CLIP_XY_TEST |
  92.              dw2);
  93.    OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
  94.              U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
  95.              GEN6_CLIP_FORCE_ZERO_RTAINDEX);
  96.    ADVANCE_BATCH();
  97. }
  98.  
  99. const struct brw_tracked_state gen6_clip_state = {
  100.    .dirty = {
  101.       .mesa  = _NEW_TRANSFORM | _NEW_LIGHT | _NEW_BUFFERS,
  102.       .brw   = BRW_NEW_CONTEXT |
  103.                BRW_NEW_META_IN_PROGRESS |
  104.                BRW_NEW_RASTERIZER_DISCARD,
  105.       .cache = CACHE_NEW_WM_PROG
  106.    },
  107.    .emit = upload_clip_state,
  108. };
  109.