1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright © 2011 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "intel_batchbuffer.h"
#include "main/fbobject.h"
#include "main/framebuffer.h"
#include "main/viewport.h"
static void
gen8_upload_sf_clip_viewport(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
float y_scale, y_bias;
const float fb_height = (float)_mesa_geometric_height(ctx->DrawBuffer);
const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
/* BRW_NEW_VIEWPORT_COUNT */
const unsigned viewport_count = brw->clip.viewport_count;
float *vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
16 * 4 * viewport_count,
64, &brw->sf.vp_offset);
/* Also assign to clip.vp_offset in case something uses it. */
brw->clip.vp_offset = brw->sf.vp_offset;
/* _NEW_BUFFERS */
if (render_to_fbo) {
y_scale = 1.0;
y_bias = 0;
} else {
y_scale = -1.0;
y_bias = fb_height;
}
for (unsigned i = 0; i < viewport_count; i++) {
float scale[3], translate[3];
_mesa_get_viewport_xform(ctx, i, scale, translate);
/* _NEW_VIEWPORT: Viewport Matrix Elements */
vp[0] = scale[0]; /* m00 */
vp[1] = scale[1] * y_scale; /* m11 */
vp[2] = scale[2]; /* m22 */
vp[3] = translate[0]; /* m30 */
vp[4] = translate[1] * y_scale + y_bias; /* m31 */
vp[5] = translate[2]; /* m32 */
/* Reserved */
vp[6] = 0;
vp[7] = 0;
/* According to the "Vertex X,Y Clamping and Quantization" section of the
* Strips and Fans documentation, objects must not have a screen-space
* extents of over 8192 pixels, or they may be mis-rasterized. The
* maximum screen space coordinates of a small object may larger, but we
* have no way to enforce the object size other than through clipping.
*
* The goal is to create the maximum sized guardband (8K x 8K) with the
* viewport rectangle in the center of the guardband. This looks weird
* because the hardware wants coordinates that are scaled to the viewport
* in NDC. In other words, an 8K x 8K viewport would have [-1,1] for X and Y.
* A 4K viewport would be [-2,2], 2K := [-4,4] etc.
*
* --------------------------------
* |Guardband |
* | |
* | ------------ |
* | |viewport | |
* | | | |
* | | | |
* | |__________| |
* | |
* | |
* |______________________________|
*
*/
const float maximum_guardband_extent = 8192;
float gbx = maximum_guardband_extent / ctx->ViewportArray[i].Width;
float gby = maximum_guardband_extent / ctx->ViewportArray[i].Height;
/* _NEW_VIEWPORT: Guardband Clipping */
vp[8] = -gbx; /* x-min */
vp[9] = gbx; /* x-max */
vp[10] = -gby; /* y-min */
vp[11] = gby; /* y-max */
/* _NEW_VIEWPORT | _NEW_BUFFERS: Screen Space Viewport
* The hardware will take the intersection of the drawing rectangle,
* scissor rectangle, and the viewport extents. We don't need to be
* smart, and can therefore just program the viewport extents.
*/
float viewport_Xmax = ctx->ViewportArray[i].X + ctx->ViewportArray[i].Width;
float viewport_Ymax = ctx->ViewportArray[i].Y + ctx->ViewportArray[i].Height;
if (render_to_fbo) {
vp[12] = ctx->ViewportArray[i].X;
vp[13] = viewport_Xmax - 1;
vp[14] = ctx->ViewportArray[i].Y;
vp[15] = viewport_Ymax - 1;
} else {
vp[12] = ctx->ViewportArray[i].X;
vp[13] = viewport_Xmax - 1;
vp[14] = fb_height - viewport_Ymax;
vp[15] = fb_height - ctx->ViewportArray[i].Y - 1;
}
vp += 16;
}
BEGIN_BATCH(2);
OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
OUT_BATCH(brw->sf.vp_offset);
ADVANCE_BATCH();
}
const struct brw_tracked_state gen8_sf_clip_viewport = {
.dirty = {
.mesa = _NEW_BUFFERS |
_NEW_VIEWPORT,
.brw = BRW_NEW_BATCH |
BRW_NEW_BLORP |
BRW_NEW_VIEWPORT_COUNT,
},
.emit = gen8_upload_sf_clip_viewport,
};
|
