src/mesa/drivers/dri/i965/gen7_viewport_state.c

   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
  29 static void
  30 gen7_upload_sf_clip_viewport(struct brw_context *brw)
  31 {
  32    struct intel_context *intel = &brw->intel;
  33    struct gl_context *ctx = &intel->ctx;
  34    const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
  35    GLfloat y_scale, y_bias;
  36    const bool render_to_fbo = (ctx->DrawBuffer->Name != 0);
  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    /* Disable guardband clipping (see gen6_viewport_state.c for rationale). */
  46    vp->guardband.xmin = -1.0;
  47    vp->guardband.xmax = 1.0;
  48    vp->guardband.ymin = -1.0;
  49    vp->guardband.ymax = 1.0;
  50
  51    /* _NEW_BUFFERS */
  52    if (render_to_fbo) {
  53       y_scale = 1.0;
  54       y_bias = 0;
  55    } else {
  56       y_scale = -1.0;
  57       y_bias = ctx->DrawBuffer->Height;
  58    }
  59
  60    /* _NEW_VIEWPORT */
  61    vp->viewport.m00 = v[MAT_SX];
  62    vp->viewport.m11 = v[MAT_SY] * y_scale;
  63    vp->viewport.m22 = v[MAT_SZ] * depth_scale;
  64    vp->viewport.m30 = v[MAT_TX];
  65    vp->viewport.m31 = v[MAT_TY] * y_scale + y_bias;
  66    vp->viewport.m32 = v[MAT_TZ] * depth_scale;
  67
  68    BEGIN_BATCH(2);
  69    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
  70    OUT_BATCH(brw->sf.vp_offset);
  71    ADVANCE_BATCH();
  72 }
  73
  74 const struct brw_tracked_state gen7_sf_clip_viewport = {
  75    .dirty = {
  76       .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
  77       .brw = BRW_NEW_BATCH,
  78       .cache = 0,
  79    },
  80    .emit = gen7_upload_sf_clip_viewport,
  81 };
  82
  83 /* ----------------------------------------------------- */
  84
  85 static void upload_cc_viewport_state_pointer(struct brw_context *brw)
  86 {
  87    struct intel_context *intel = &brw->intel;
  88
  89    BEGIN_BATCH(2);
  90    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_CC << 16 | (2 - 2));
  91    OUT_BATCH(brw->cc.vp_offset);
  92    ADVANCE_BATCH();
  93 }
  94
  95 const struct brw_tracked_state gen7_cc_viewport_state_pointer = {
  96    .dirty = {
  97       .mesa = 0,
  98       .brw = BRW_NEW_BATCH,
  99       .cache = CACHE_NEW_CC_VP
 100    },
 101    .emit = upload_cc_viewport_state_pointer,
 102 };