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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. #include "main/viewport.h"
  30.  
  31. static void
  32. gen7_upload_sf_clip_viewport(struct brw_context *brw)
  33. {
  34.    struct gl_context *ctx = &brw->ctx;
  35.    GLfloat y_scale, y_bias;
  36.    const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
  37.    struct gen7_sf_clip_viewport *vp;
  38.  
  39.    vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
  40.                         sizeof(*vp) * ctx->Const.MaxViewports, 64,
  41.                         &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.    /* _NEW_BUFFERS */
  46.    if (render_to_fbo) {
  47.       y_scale = 1.0;
  48.       y_bias = 0;
  49.    } else {
  50.       y_scale = -1.0;
  51.       y_bias = ctx->DrawBuffer->Height;
  52.    }
  53.  
  54.    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
  55.       double scale[3], translate[3];
  56.       _mesa_get_viewport_xform(ctx, i, scale, translate);
  57.  
  58.       /* According to the "Vertex X,Y Clamping and Quantization" section of
  59.        * the Strips and Fans documentation, objects must not have a
  60.        * screen-space extents of over 8192 pixels, or they may be
  61.        * mis-rasterized.  The maximum screen space coordinates of a small
  62.        * object may larger, but we have no way to enforce the object size
  63.        * other than through clipping.
  64.        *
  65.        * If you're surprised that we set clip to -gbx to +gbx and it seems
  66.        * like we'll end up with 16384 wide, note that for a 8192-wide render
  67.        * target, we'll end up with a normal (-1, 1) clip volume that just
  68.        * covers the drawable.
  69.        */
  70.       const float maximum_guardband_extent = 8192;
  71.       const float gbx = maximum_guardband_extent / ctx->ViewportArray[i].Width;
  72.       const float gby = maximum_guardband_extent / ctx->ViewportArray[i].Height;
  73.  
  74.       vp[i].guardband.xmin = -gbx;
  75.       vp[i].guardband.xmax = gbx;
  76.       vp[i].guardband.ymin = -gby;
  77.       vp[i].guardband.ymax = gby;
  78.  
  79.       /* _NEW_VIEWPORT */
  80.       vp[i].viewport.m00 = scale[0];
  81.       vp[i].viewport.m11 = scale[1] * y_scale;
  82.       vp[i].viewport.m22 = scale[2];
  83.       vp[i].viewport.m30 = translate[0];
  84.       vp[i].viewport.m31 = translate[1] * y_scale + y_bias;
  85.       vp[i].viewport.m32 = translate[2];
  86.    }
  87.  
  88.    BEGIN_BATCH(2);
  89.    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
  90.    OUT_BATCH(brw->sf.vp_offset);
  91.    ADVANCE_BATCH();
  92. }
  93.  
  94. const struct brw_tracked_state gen7_sf_clip_viewport = {
  95.    .dirty = {
  96.       .mesa = _NEW_BUFFERS |
  97.               _NEW_VIEWPORT,
  98.       .brw = BRW_NEW_BATCH,
  99.    },
  100.    .emit = gen7_upload_sf_clip_viewport,
  101. };
  102.