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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/framebuffer.h"
  34.  
  35. static void
  36. gen6_upload_scissor_state(struct brw_context *brw)
  37. {
  38.    struct gl_context *ctx = &brw->ctx;
  39.    const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
  40.    struct gen6_scissor_rect *scissor;
  41.    uint32_t scissor_state_offset;
  42.  
  43.    scissor = brw_state_batch(brw, AUB_TRACE_SCISSOR_STATE,
  44.                              sizeof(*scissor) * ctx->Const.MaxViewports, 32,
  45.                              &scissor_state_offset);
  46.  
  47.    /* _NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT */
  48.  
  49.    /* The scissor only needs to handle the intersection of drawable and
  50.     * scissor rect.  Clipping to the boundaries of static shared buffers
  51.     * for front/back/depth is covered by looping over cliprects in brw_draw.c.
  52.     *
  53.     * Note that the hardware's coordinates are inclusive, while Mesa's min is
  54.     * inclusive but max is exclusive.
  55.     */
  56.    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
  57.       int bbox[4];
  58.  
  59.       _mesa_scissor_bounding_box(ctx, ctx->DrawBuffer, i, bbox);
  60.  
  61.       if (bbox[0] == bbox[1] || bbox[2] == bbox[3]) {
  62.          /* If the scissor was out of bounds and got clamped to 0 width/height
  63.           * at the bounds, the subtraction of 1 from maximums could produce a
  64.           * negative number and thus not clip anything.  Instead, just provide
  65.           * a min > max scissor inside the bounds, which produces the expected
  66.           * no rendering.
  67.           */
  68.          scissor[i].xmin = 1;
  69.          scissor[i].xmax = 0;
  70.          scissor[i].ymin = 1;
  71.          scissor[i].ymax = 0;
  72.       } else if (render_to_fbo) {
  73.          /* texmemory: Y=0=bottom */
  74.          scissor[i].xmin = bbox[0];
  75.          scissor[i].xmax = bbox[1] - 1;
  76.          scissor[i].ymin = bbox[2];
  77.          scissor[i].ymax = bbox[3] - 1;
  78.       }
  79.       else {
  80.          /* memory: Y=0=top */
  81.          scissor[i].xmin = bbox[0];
  82.          scissor[i].xmax = bbox[1] - 1;
  83.          scissor[i].ymin = ctx->DrawBuffer->Height - bbox[3];
  84.          scissor[i].ymax = ctx->DrawBuffer->Height - bbox[2] - 1;
  85.       }
  86.    }
  87.    BEGIN_BATCH(2);
  88.    OUT_BATCH(_3DSTATE_SCISSOR_STATE_POINTERS << 16 | (2 - 2));
  89.    OUT_BATCH(scissor_state_offset);
  90.    ADVANCE_BATCH();
  91. }
  92.  
  93. const struct brw_tracked_state gen6_scissor_state = {
  94.    .dirty = {
  95.       .mesa = _NEW_BUFFERS |
  96.               _NEW_SCISSOR |
  97.               _NEW_VIEWPORT,
  98.       .brw = BRW_NEW_BATCH,
  99.    },
  100.    .emit = gen6_upload_scissor_state,
  101. };
  102.