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 prepare_sf_clip_viewport(struct brw_context *brw)
  31 {
  32    struct gl_context *ctx = &brw->intel.ctx;
  33    const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
  34    GLfloat y_scale, y_bias;
  35    const GLboolean render_to_fbo = (ctx->DrawBuffer->Name != 0);
  36    const GLfloat *v = ctx->Viewport._WindowMap.m;
  37    struct gen7_sf_clip_viewport *vp;
  38
  39    vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
  40                         sizeof(vp), 64, &brw->sf.vp_offset);
  41    /* Also assign to clip.vp_offset in case something uses it. */
  42    brw->clip.vp_offset = brw->sf.vp_offset;
  43
  44    /* Disable guardband clipping (see gen6_viewport_state.c for rationale). */
  45    vp->guardband.xmin = -1.0;
  46    vp->guardband.xmax = 1.0;
  47    vp->guardband.ymin = -1.0;
  48    vp->guardband.ymax = 1.0;
  49
  50    /* _NEW_BUFFERS */
  51    if (render_to_fbo) {
  52       y_scale = 1.0;
  53       y_bias = 0;
  54    } else {
  55       y_scale = -1.0;
  56       y_bias = ctx->DrawBuffer->Height;
  57    }
  58
  59    /* _NEW_VIEWPORT */
  60    vp->viewport.m00 = v[MAT_SX];
  61    vp->viewport.m11 = v[MAT_SY] * y_scale;
  62    vp->viewport.m22 = v[MAT_SZ] * depth_scale;
  63    vp->viewport.m30 = v[MAT_TX];
  64    vp->viewport.m31 = v[MAT_TY] * y_scale + y_bias;
  65    vp->viewport.m32 = v[MAT_TZ] * depth_scale;
  66 }
  67
  68 static void upload_sf_clip_viewport_state_pointer(struct brw_context *brw)
  69 {
  70    struct intel_context *intel = &brw->intel;
  71
  72    BEGIN_BATCH(2);
  73    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
  74    OUT_BATCH(brw->sf.vp_offset);
  75    ADVANCE_BATCH();
  76 }
  77
  78 const struct brw_tracked_state gen7_sf_clip_viewport = {
  79    .dirty = {
  80       .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
  81       .brw = BRW_NEW_BATCH,
  82       .cache = 0,
  83    },
  84    .prepare = prepare_sf_clip_viewport,
  85    .emit = upload_sf_clip_viewport_state_pointer,
  86 };
  87
  88 /* ----------------------------------------------------- */
  89
  90 static void upload_cc_viewport_state_pointer(struct brw_context *brw)
  91 {
  92    struct intel_context *intel = &brw->intel;
  93
  94    BEGIN_BATCH(2);
  95    OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_CC << 16 | (2 - 2));
  96    OUT_BATCH(brw->cc.vp_offset);
  97    ADVANCE_BATCH();
  98 }
  99
 100 const struct brw_tracked_state gen7_cc_viewport_state_pointer = {
 101    .dirty = {
 102       .mesa = 0,
 103       .brw = BRW_NEW_BATCH,
 104       .cache = CACHE_NEW_CC_VP
 105    },
 106    .emit = upload_cc_viewport_state_pointer,
 107 };