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 #include "main/fbobject.h"
29 #include "main/framebuffer.h"
30 #include "main/viewport.h"
31
32 static void
gen8_upload_sf_clip_viewport(struct brw_context * brw)33 gen8_upload_sf_clip_viewport(struct brw_context *brw)
34 {
35 struct gl_context *ctx = &brw->ctx;
36 const struct gen_device_info *devinfo = &brw->screen->devinfo;
37 float y_scale, y_bias;
38
39 /* BRW_NEW_VIEWPORT_COUNT */
40 const unsigned viewport_count = brw->clip.viewport_count;
41
42 /* _NEW_BUFFERS */
43 struct gl_framebuffer *fb = ctx->DrawBuffer;
44 const bool render_to_fbo = _mesa_is_user_fbo(fb);
45 const uint32_t fb_width = _mesa_geometric_width(ctx->DrawBuffer);
46 const uint32_t fb_height = _mesa_geometric_height(ctx->DrawBuffer);
47
48 float *vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
49 16 * 4 * viewport_count,
50 64, &brw->sf.vp_offset);
51 /* Also assign to clip.vp_offset in case something uses it. */
52 brw->clip.vp_offset = brw->sf.vp_offset;
53
54 /* _NEW_BUFFERS */
55 if (render_to_fbo) {
56 y_scale = 1.0;
57 y_bias = 0;
58 } else {
59 y_scale = -1.0;
60 y_bias = (float)fb_height;
61 }
62
63 for (unsigned i = 0; i < viewport_count; i++) {
64 float scale[3], translate[3];
65 _mesa_get_viewport_xform(ctx, i, scale, translate);
66
67 /* _NEW_VIEWPORT: Viewport Matrix Elements */
68 vp[0] = scale[0]; /* m00 */
69 vp[1] = scale[1] * y_scale; /* m11 */
70 vp[2] = scale[2]; /* m22 */
71 vp[3] = translate[0]; /* m30 */
72 vp[4] = translate[1] * y_scale + y_bias; /* m31 */
73 vp[5] = translate[2]; /* m32 */
74
75 /* Reserved */
76 vp[6] = 0;
77 vp[7] = 0;
78
79 brw_calculate_guardband_size(devinfo, fb_width, fb_height,
80 vp[0], vp[1], vp[3], vp[4],
81 &vp[8], &vp[9], &vp[10], &vp[11]);
82
83 /* _NEW_VIEWPORT | _NEW_BUFFERS: Screen Space Viewport
84 * The hardware will take the intersection of the drawing rectangle,
85 * scissor rectangle, and the viewport extents. We don't need to be
86 * smart, and can therefore just program the viewport extents.
87 */
88 float viewport_Xmax = ctx->ViewportArray[i].X + ctx->ViewportArray[i].Width;
89 float viewport_Ymax = ctx->ViewportArray[i].Y + ctx->ViewportArray[i].Height;
90 if (render_to_fbo) {
91 vp[12] = ctx->ViewportArray[i].X;
92 vp[13] = viewport_Xmax - 1;
93 vp[14] = ctx->ViewportArray[i].Y;
94 vp[15] = viewport_Ymax - 1;
95 } else {
96 vp[12] = ctx->ViewportArray[i].X;
97 vp[13] = viewport_Xmax - 1;
98 vp[14] = fb_height - viewport_Ymax;
99 vp[15] = fb_height - ctx->ViewportArray[i].Y - 1;
100 }
101
102 vp += 16;
103 }
104
105 BEGIN_BATCH(2);
106 OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
107 OUT_BATCH(brw->sf.vp_offset);
108 ADVANCE_BATCH();
109 }
110
111 const struct brw_tracked_state gen8_sf_clip_viewport = {
112 .dirty = {
113 .mesa = _NEW_BUFFERS |
114 _NEW_VIEWPORT,
115 .brw = BRW_NEW_BATCH |
116 BRW_NEW_BLORP |
117 BRW_NEW_VIEWPORT_COUNT,
118 },
119 .emit = gen8_upload_sf_clip_viewport,
120 };
121