1/**************************************************************************
2 *
3 * Copyright 2019 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29/*
30 * Miscellantous state tracker utility functions, macros.
31 */
32
33
34#ifndef ST_UTIL
35#define ST_UTIL
36
37
38#include "state_tracker/st_context.h"
39
40
41#ifdef __cplusplus
42extern "C" {
43#endif
44
45
46/** For drawing quads for glClear, glDraw/CopyPixels, glBitmap, etc. */
47struct st_util_vertex
48{
49   float x, y, z;
50   float r, g, b, a;
51   float s, t;
52};
53
54
55
56/* Invalidate the readpixels cache to ensure we don't read stale data.
57 */
58static inline void
59st_invalidate_readpix_cache(struct st_context *st)
60{
61   if (unlikely(st->readpix_cache.src)) {
62      pipe_resource_reference(&st->readpix_cache.src, NULL);
63      pipe_resource_reference(&st->readpix_cache.cache, NULL);
64   }
65}
66
67static inline bool
68st_user_clip_planes_enabled(struct gl_context *ctx)
69{
70   return (ctx->API == API_OPENGL_COMPAT ||
71           ctx->API == API_OPENGLES) && /* only ES 1.x */
72          ctx->Transform.ClipPlanesEnabled;
73}
74
75static inline bool
76st_point_size_per_vertex(struct gl_context *ctx)
77{
78   const struct gl_program *vertProg = ctx->VertexProgram._Current;
79   if (vertProg) {
80      if (vertProg->Id == 0) {
81         if (vertProg->info.outputs_written &
82             BITFIELD64_BIT(VARYING_SLOT_PSIZ)) {
83            /* generated program which emits point size */
84            return true;
85         }
86      }
87      else if (ctx->API != API_OPENGLES2) {
88         /* PointSizeEnabled is always set in ES2 contexts */
89         return ctx->VertexProgram.PointSizeEnabled;
90      }
91      else {
92         /* ST_NEW_TESSEVAL_PROGRAM | ST_NEW_GEOMETRY_PROGRAM */
93         /* We have to check the last bound stage and see if it writes psize */
94         struct gl_program *last = NULL;
95         if (ctx->GeometryProgram._Current)
96            last = ctx->GeometryProgram._Current;
97         else if (ctx->TessEvalProgram._Current)
98            last = ctx->TessEvalProgram._Current;
99         else if (ctx->VertexProgram._Current)
100            last = ctx->VertexProgram._Current;
101         if (last)
102            return !!(last->info.outputs_written &
103                      BITFIELD64_BIT(VARYING_SLOT_PSIZ));
104      }
105   }
106   return false;
107}
108
109#ifdef __cplusplus
110}
111#endif
112
113
114#endif /* ST_UTIL */
115