Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

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