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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 "intel_batchbuffer.h"
  28. #include "main/fbobject.h"
  29.  
  30. static void
  31. gen7_upload_sf_clip_viewport(struct brw_context *brw)
  32. {
  33.    struct gl_context *ctx = &brw->ctx;
  34.    const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
  35.    GLfloat y_scale, y_bias;
  36.    const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
  37.    const GLfloat *v = ctx->Viewport._WindowMap.m;
  38.    struct gen7_sf_clip_viewport *vp;
  39.  
  40.    vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
  41.                         sizeof(*vp), 64, &brw->sf.vp_offset);
  42.    /* Also assign to clip.vp_offset in case something uses it. */
  43.    brw->clip.vp_offset = brw->sf.vp_offset;
  44.  
  45.    /* According to the "Vertex X,Y Clamping and Quantization" section of the
  46.     * Strips and Fans documentation, objects must not have a screen-space
  47.     * extents of over 8192 pixels, or they may be mis-rasterized.  The maximum
  48.     * screen space coordinates of a small object may larger, but we have no
  49.     * way to enforce the object size other than through clipping.
  50.     *
  51.     * If you're surprised that we set clip to -gbx to +gbx and it seems like
  52.     * we'll end up with 16384 wide, note that for a 8192-wide render target,
  53.     * we'll end up with a normal (-1, 1) clip volume that just covers the
  54.     * drawable.
  55.     */
  56.    const float maximum_guardband_extent = 8192;
  57.    float gbx = maximum_guardband_extent / (float) ctx->Viewport.Width;
  58.    float gby = maximum_guardband_extent / (float) ctx->Viewport.Height;
  59.  
  60.    vp->guardband.xmin = -gbx;
  61.    vp->guardband.xmax = gbx;
  62.    vp->guardband.ymin = -gby;
  63.    vp->guardband.ymax = gby;
  64.  
  65.    /* _NEW_BUFFERS */
  66.    if (render_to_fbo) {
  67.       y_scale = 1.0;
  68.       y_bias = 0;
  69.    } else {
  70.       y_scale = -1.0;
  71.       y_bias = ctx->DrawBuffer->Height;
  72.    }
  73.  
  74.    /* _NEW_VIEWPORT */
  75.    vp->viewport.m00 = v[MAT_SX];
  76.    vp->viewport.m11 = v[MAT_SY] * y_scale;
  77.    vp->viewport.m22 = v[MAT_SZ] * depth_scale;
  78.    vp->viewport.m30 = v[MAT_TX];
  79.    vp->viewport.m31 = v[MAT_TY] * y_scale + y_bias;
  80.    vp->viewport.m32 = v[MAT_TZ] * depth_scale;
  81.  
  82.    BEGIN_BATCH(2);
  83.    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
  84.    OUT_BATCH(brw->sf.vp_offset);
  85.    ADVANCE_BATCH();
  86. }
  87.  
  88. const struct brw_tracked_state gen7_sf_clip_viewport = {
  89.    .dirty = {
  90.       .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
  91.       .brw = BRW_NEW_BATCH,
  92.       .cache = 0,
  93.    },
  94.    .emit = gen7_upload_sf_clip_viewport,
  95. };
  96.  
  97. /* ----------------------------------------------------- */
  98.  
  99. static void upload_cc_viewport_state_pointer(struct brw_context *brw)
  100. {
  101.    BEGIN_BATCH(2);
  102.    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_CC << 16 | (2 - 2));
  103.    OUT_BATCH(brw->cc.vp_offset);
  104.    ADVANCE_BATCH();
  105. }
  106.  
  107. const struct brw_tracked_state gen7_cc_viewport_state_pointer = {
  108.    .dirty = {
  109.       .mesa = 0,
  110.       .brw = BRW_NEW_BATCH,
  111.       .cache = CACHE_NEW_CC_VP
  112.    },
  113.    .emit = upload_cc_viewport_state_pointer,
  114. };
  115.