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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 "intel_batchbuffer.h"
  32. #include "main/fbobject.h"
  33. #include "main/viewport.h"
  34.  
  35. /* The clip VP defines the guardband region where expensive clipping is skipped
  36.  * and fragments are allowed to be generated and clipped out cheaply by the SF.
  37.  */
  38. static void
  39. gen6_upload_clip_vp(struct brw_context *brw)
  40. {
  41.    struct gl_context *ctx = &brw->ctx;
  42.    struct brw_clipper_viewport *vp;
  43.  
  44.    vp = brw_state_batch(brw, AUB_TRACE_CLIP_VP_STATE,
  45.                         sizeof(*vp) * ctx->Const.MaxViewports, 32, &brw->clip.vp_offset);
  46.  
  47.    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
  48.       /* According to the "Vertex X,Y Clamping and Quantization" section of the
  49.        * Strips and Fans documentation, objects must not have a screen-space
  50.        * extents of over 8192 pixels, or they may be mis-rasterized.  The maximum
  51.        * screen space coordinates of a small object may larger, but we have no
  52.        * way to enforce the object size other than through clipping.
  53.        *
  54.        * If you're surprised that we set clip to -gbx to +gbx and it seems like
  55.        * we'll end up with 16384 wide, note that for a 8192-wide render target,
  56.        * we'll end up with a normal (-1, 1) clip volume that just covers the
  57.        * drawable.
  58.        */
  59.       const float maximum_post_clamp_delta = 8192;
  60.       float gbx = maximum_post_clamp_delta / ctx->ViewportArray[i].Width;
  61.       float gby = maximum_post_clamp_delta / ctx->ViewportArray[i].Height;
  62.  
  63.       vp[i].xmin = -gbx;
  64.       vp[i].xmax = gbx;
  65.       vp[i].ymin = -gby;
  66.       vp[i].ymax = gby;
  67.    }
  68.  
  69.    brw->ctx.NewDriverState |= BRW_NEW_CLIP_VP;
  70. }
  71.  
  72. const struct brw_tracked_state gen6_clip_vp = {
  73.    .dirty = {
  74.       .mesa = _NEW_VIEWPORT,
  75.       .brw = BRW_NEW_BATCH,
  76.    },
  77.    .emit = gen6_upload_clip_vp,
  78. };
  79.  
  80. static void
  81. gen6_upload_sf_vp(struct brw_context *brw)
  82. {
  83.    struct gl_context *ctx = &brw->ctx;
  84.    struct gen6_sf_viewport *sfv;
  85.    GLfloat y_scale, y_bias;
  86.    const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
  87.  
  88.    sfv = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
  89.                          sizeof(*sfv) * ctx->Const.MaxViewports,
  90.                          32, &brw->sf.vp_offset);
  91.    memset(sfv, 0, sizeof(*sfv) * ctx->Const.MaxViewports);
  92.  
  93.    /* _NEW_BUFFERS */
  94.    if (render_to_fbo) {
  95.       y_scale = 1.0;
  96.       y_bias = 0;
  97.    } else {
  98.       y_scale = -1.0;
  99.       y_bias = ctx->DrawBuffer->Height;
  100.    }
  101.  
  102.    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
  103.       double scale[3], translate[3];
  104.  
  105.       /* _NEW_VIEWPORT */
  106.       _mesa_get_viewport_xform(ctx, i, scale, translate);
  107.       sfv[i].m00 = scale[0];
  108.       sfv[i].m11 = scale[1] * y_scale;
  109.       sfv[i].m22 = scale[2];
  110.       sfv[i].m30 = translate[0];
  111.       sfv[i].m31 = translate[1] * y_scale + y_bias;
  112.       sfv[i].m32 = translate[2];
  113.  
  114.    }
  115.  
  116.    brw->ctx.NewDriverState |= BRW_NEW_SF_VP;
  117. }
  118.  
  119. const struct brw_tracked_state gen6_sf_vp = {
  120.    .dirty = {
  121.       .mesa = _NEW_BUFFERS |
  122.               _NEW_VIEWPORT,
  123.       .brw = BRW_NEW_BATCH,
  124.    },
  125.    .emit = gen6_upload_sf_vp,
  126. };
  127.  
  128. static void upload_viewport_state_pointers(struct brw_context *brw)
  129. {
  130.    BEGIN_BATCH(4);
  131.    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS << 16 | (4 - 2) |
  132.              GEN6_CC_VIEWPORT_MODIFY |
  133.              GEN6_SF_VIEWPORT_MODIFY |
  134.              GEN6_CLIP_VIEWPORT_MODIFY);
  135.    OUT_BATCH(brw->clip.vp_offset);
  136.    OUT_BATCH(brw->sf.vp_offset);
  137.    OUT_BATCH(brw->cc.vp_offset);
  138.    ADVANCE_BATCH();
  139. }
  140.  
  141. const struct brw_tracked_state gen6_viewport_state = {
  142.    .dirty = {
  143.       .mesa = 0,
  144.       .brw = BRW_NEW_BATCH |
  145.              BRW_NEW_CC_VP |
  146.              BRW_NEW_CLIP_VP |
  147.              BRW_NEW_SF_VP |
  148.              BRW_NEW_STATE_BASE_ADDRESS,
  149.    },
  150.    .emit = upload_viewport_state_pointers,
  151. };
  152.