1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.8
4 *
5 * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the next
15 * paragraph) shall be included in all copies or substantial portions of the
16 * Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 * DEALINGS IN THE SOFTWARE.
25 */
26
27 /**
28 * \file condrender.c
29 * Conditional rendering functions
30 *
31 * \author Brian Paul
32 */
33
34 #include "glheader.h"
35 #include "condrender.h"
36 #include "enums.h"
37 #include "mtypes.h"
38 #include "queryobj.h"
39
40
41 void GLAPIENTRY
_mesa_BeginConditionalRender(GLuint queryId,GLenum mode)42 _mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
43 {
44 struct gl_query_object *q;
45 GET_CURRENT_CONTEXT(ctx);
46
47 if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery ||
48 queryId == 0) {
49 _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
50 return;
51 }
52
53 ASSERT(ctx->Query.CondRenderMode == GL_NONE);
54
55 switch (mode) {
56 case GL_QUERY_WAIT:
57 case GL_QUERY_NO_WAIT:
58 case GL_QUERY_BY_REGION_WAIT:
59 case GL_QUERY_BY_REGION_NO_WAIT:
60 /* OK */
61 break;
62 default:
63 _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
64 _mesa_lookup_enum_by_nr(mode));
65 return;
66 }
67
68 q = _mesa_lookup_query_object(ctx, queryId);
69 if (!q) {
70 _mesa_error(ctx, GL_INVALID_VALUE,
71 "glBeginConditionalRender(bad queryId=%u)", queryId);
72 return;
73 }
74 ASSERT(q->Id == queryId);
75
76 if (q->Target != GL_SAMPLES_PASSED || q->Active) {
77 _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
78 return;
79 }
80
81 ctx->Query.CondRenderQuery = q;
82 ctx->Query.CondRenderMode = mode;
83
84 if (ctx->Driver.BeginConditionalRender)
85 ctx->Driver.BeginConditionalRender(ctx, q, mode);
86 }
87
88
89 void APIENTRY
_mesa_EndConditionalRender(void)90 _mesa_EndConditionalRender(void)
91 {
92 GET_CURRENT_CONTEXT(ctx);
93
94 FLUSH_VERTICES(ctx, 0x0);
95
96 if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
97 _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
98 return;
99 }
100
101 if (ctx->Driver.EndConditionalRender)
102 ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
103
104 ctx->Query.CondRenderQuery = NULL;
105 ctx->Query.CondRenderMode = GL_NONE;
106 }
107
108
109 /**
110 * This function is called by software rendering commands (all point,
111 * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
112 * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
113 * commands should be
114 * executed or discarded depending on the current conditional
115 * rendering state. Ideally, this check would be implemented by the
116 * GPU when doing hardware rendering. XXX should this function be
117 * called via a new driver hook?
118 *
119 * \return GL_TRUE if we should render, GL_FALSE if we should discard
120 */
121 GLboolean
_mesa_check_conditional_render(struct gl_context * ctx)122 _mesa_check_conditional_render(struct gl_context *ctx)
123 {
124 struct gl_query_object *q = ctx->Query.CondRenderQuery;
125
126 if (!q) {
127 /* no query in progress - draw normally */
128 return GL_TRUE;
129 }
130
131 switch (ctx->Query.CondRenderMode) {
132 case GL_QUERY_BY_REGION_WAIT:
133 /* fall-through */
134 case GL_QUERY_WAIT:
135 if (!q->Ready) {
136 ctx->Driver.WaitQuery(ctx, q);
137 }
138 return q->Result > 0;
139 case GL_QUERY_BY_REGION_NO_WAIT:
140 /* fall-through */
141 case GL_QUERY_NO_WAIT:
142 if (!q->Ready)
143 ctx->Driver.CheckQuery(ctx, q);
144 return q->Ready ? (q->Result > 0) : GL_TRUE;
145 default:
146 _mesa_problem(ctx, "Bad cond render mode %s in "
147 " _mesa_check_conditional_render()",
148 _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
149 return GL_TRUE;
150 }
151 }
152