src/mesa/drivers/dri/i965/gen6_viewport_state.c

   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 "brw_util.h"
  32 #include "intel_batchbuffer.h"
  33 #include "main/macros.h"
  34 #include "main/enums.h"
  35
  36 /* The clip VP defines the guardband region where expensive clipping is skipped
  37  * and fragments are allowed to be generated and clipped out cheaply by the SF.
  38  *
  39  * By setting it to NDC bounds of [-1,1], we don't do GB clipping.  It's
  40  * supposed to cause seams to become visible in apps due to shared edges taking
  41  * different clip/no clip paths depending on whether the rest of the prim ends
  42  * up in the guardband or not.
  43  */
  44 static void
  45 prepare_clip_vp(struct brw_context *brw)
  46 {
  47    struct brw_clipper_viewport vp;
  48
  49    vp.xmin = -1.0;
  50    vp.xmax = 1.0;
  51    vp.ymin = -1.0;
  52    vp.ymax = 1.0;
  53
  54    drm_intel_bo_unreference(brw->clip.vp_bo);
  55    brw->clip.vp_bo = brw_cache_data(&brw->cache, BRW_CLIP_VP,
  56                                     &vp, sizeof(vp),
  57                                     NULL, 0);
  58 }
  59
  60 const struct brw_tracked_state gen6_clip_vp = {
  61    .dirty = {
  62       .mesa = _NEW_VIEWPORT, /* XXX: not really, but we need nonzero */
  63       .brw = 0,
  64       .cache = 0,
  65    },
  66    .prepare = prepare_clip_vp,
  67 };
  68
  69 static void
  70 prepare_sf_vp(struct brw_context *brw)
  71 {
  72    GLcontext *ctx = &brw->intel.ctx;
  73    const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
  74    struct brw_sf_viewport sfv;
  75    GLfloat y_scale, y_bias;
  76    const GLboolean render_to_fbo = (ctx->DrawBuffer->Name != 0);
  77    const GLfloat *v = ctx->Viewport._WindowMap.m;
  78
  79    memset(&sfv, 0, sizeof(sfv));
  80
  81    /* _NEW_BUFFERS */
  82    if (render_to_fbo) {
  83       y_scale = 1.0;
  84       y_bias = 0;
  85    } else {
  86       y_scale = -1.0;
  87       y_bias = ctx->DrawBuffer->Height;
  88    }
  89
  90    /* _NEW_VIEWPORT */
  91    sfv.viewport.m00 = v[MAT_SX];
  92    sfv.viewport.m11 = v[MAT_SY] * y_scale;
  93    sfv.viewport.m22 = v[MAT_SZ] * depth_scale;
  94    sfv.viewport.m30 = v[MAT_TX];
  95    sfv.viewport.m31 = v[MAT_TY] * y_scale + y_bias;
  96    sfv.viewport.m32 = v[MAT_TZ] * depth_scale;
  97
  98    drm_intel_bo_unreference(brw->sf.vp_bo);
  99    brw->sf.vp_bo = brw_cache_data(&brw->cache, BRW_SF_VP,
 100                                   &sfv, sizeof(sfv),
 101                                   NULL, 0);
 102 }
 103
 104 const struct brw_tracked_state gen6_sf_vp = {
 105    .dirty = {
 106       .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
 107       .brw = 0,
 108       .cache = 0,
 109    },
 110    .prepare = prepare_sf_vp,
 111 };
 112
 113 static void
 114 prepare_cc_vp(struct brw_context *brw)
 115 {
 116    GLcontext *ctx = &brw->intel.ctx;
 117    struct brw_cc_viewport ccv;
 118
 119    /* _NEW_TRANSOFORM */
 120    if (ctx->Transform.DepthClamp) {
 121       /* _NEW_VIEWPORT */
 122       ccv.min_depth = MIN2(ctx->Viewport.Near, ctx->Viewport.Far);
 123       ccv.max_depth = MAX2(ctx->Viewport.Near, ctx->Viewport.Far);
 124    } else {
 125       ccv.min_depth = 0.0;
 126       ccv.max_depth = 1.0;
 127    }
 128
 129    drm_intel_bo_unreference(brw->cc.vp_bo);
 130    brw->cc.vp_bo = brw_cache_data(&brw->cache, BRW_CC_VP, &ccv, sizeof(ccv),
 131                                   NULL, 0);
 132 }
 133
 134 const struct brw_tracked_state gen6_cc_vp = {
 135    .dirty = {
 136       .mesa = _NEW_VIEWPORT | _NEW_TRANSFORM,
 137       .brw = 0,
 138       .cache = 0,
 139    },
 140    .prepare = prepare_cc_vp,
 141 };
 142
 143 static void prepare_viewport_state_pointers(struct brw_context *brw)
 144 {
 145    brw_add_validated_bo(brw, brw->sf.state_bo);
 146 }
 147
 148 static void upload_viewport_state_pointers(struct brw_context *brw)
 149 {
 150    struct intel_context *intel = &brw->intel;
 151
 152    BEGIN_BATCH(4);
 153    OUT_BATCH(CMD_VIEWPORT_STATE_POINTERS << 16 | (4 - 2) |
 154              GEN6_CC_VIEWPORT_MODIFY |
 155              GEN6_SF_VIEWPORT_MODIFY |
 156              GEN6_CLIP_VIEWPORT_MODIFY);
 157    OUT_RELOC(brw->clip.vp_bo, I915_GEM_DOMAIN_INSTRUCTION, 0, 0);
 158    OUT_RELOC(brw->sf.vp_bo, I915_GEM_DOMAIN_INSTRUCTION, 0, 0);
 159    OUT_RELOC(brw->cc.vp_bo, I915_GEM_DOMAIN_INSTRUCTION, 0, 0);
 160    ADVANCE_BATCH();
 161
 162    intel_batchbuffer_emit_mi_flush(intel->batch);
 163 }
 164
 165 const struct brw_tracked_state gen6_viewport_state = {
 166    .dirty = {
 167       .mesa = 0,
 168       .brw = BRW_NEW_BATCH,
 169       .cache = (CACHE_NEW_CLIP_VP |
 170                 CACHE_NEW_SF_VP |
 171                 CACHE_NEW_CC_VP)
 172    },
 173    .prepare = prepare_viewport_state_pointers,
 174    .emit = upload_viewport_state_pointers,
 175 };