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
34 /* The clip VP defines the guardband region where expensive clipping is skipped
35 * and fragments are allowed to be generated and clipped out cheaply by the SF.
36 *
37 * By setting it to NDC bounds of [-1,1], we don't do GB clipping. It's
38 * supposed to cause seams to become visible in apps due to shared edges taking
39 * different clip/no clip paths depending on whether the rest of the prim ends
40 * up in the guardband or not.
41 */
42 static void
gen6_upload_clip_vp(struct brw_context * brw)43 gen6_upload_clip_vp(struct brw_context *brw)
44 {
45 struct brw_clipper_viewport *vp;
46
47 vp = brw_state_batch(brw, AUB_TRACE_CLIP_VP_STATE,
48 sizeof(*vp), 32, &brw->clip.vp_offset);
49
50 vp->xmin = -1.0;
51 vp->xmax = 1.0;
52 vp->ymin = -1.0;
53 vp->ymax = 1.0;
54
55 brw->state.dirty.cache |= CACHE_NEW_CLIP_VP;
56 }
57
58 const struct brw_tracked_state gen6_clip_vp = {
59 .dirty = {
60 .mesa = 0,
61 .brw = BRW_NEW_BATCH,
62 .cache = 0,
63 },
64 .emit = gen6_upload_clip_vp,
65 };
66
67 static void
gen6_upload_sf_vp(struct brw_context * brw)68 gen6_upload_sf_vp(struct brw_context *brw)
69 {
70 struct gl_context *ctx = &brw->intel.ctx;
71 const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF;
72 struct brw_sf_viewport *sfv;
73 GLfloat y_scale, y_bias;
74 const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
75 const GLfloat *v = ctx->Viewport._WindowMap.m;
76
77 sfv = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
78 sizeof(*sfv), 32, &brw->sf.vp_offset);
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 brw->state.dirty.cache |= CACHE_NEW_SF_VP;
99 }
100
101 const struct brw_tracked_state gen6_sf_vp = {
102 .dirty = {
103 .mesa = _NEW_VIEWPORT | _NEW_BUFFERS,
104 .brw = BRW_NEW_BATCH,
105 .cache = 0,
106 },
107 .emit = gen6_upload_sf_vp,
108 };
109
upload_viewport_state_pointers(struct brw_context * brw)110 static void upload_viewport_state_pointers(struct brw_context *brw)
111 {
112 struct intel_context *intel = &brw->intel;
113
114 BEGIN_BATCH(4);
115 OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS << 16 | (4 - 2) |
116 GEN6_CC_VIEWPORT_MODIFY |
117 GEN6_SF_VIEWPORT_MODIFY |
118 GEN6_CLIP_VIEWPORT_MODIFY);
119 OUT_BATCH(brw->clip.vp_offset);
120 OUT_BATCH(brw->sf.vp_offset);
121 OUT_BATCH(brw->cc.vp_offset);
122 ADVANCE_BATCH();
123 }
124
125 const struct brw_tracked_state gen6_viewport_state = {
126 .dirty = {
127 .mesa = 0,
128 .brw = (BRW_NEW_BATCH |
129 BRW_NEW_STATE_BASE_ADDRESS),
130 .cache = (CACHE_NEW_CLIP_VP |
131 CACHE_NEW_SF_VP |
132 CACHE_NEW_CC_VP)
133 },
134 .emit = upload_viewport_state_pointers,
135 };
136