1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 2009 VMware, Inc. 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 "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 */
25
26 /**
27 * \file condrender.c
28 * Conditional rendering functions
29 *
30 * \author Brian Paul
31 */
32
33 #include "glheader.h"
34 #include "condrender.h"
35 #include "enums.h"
36 #include "mtypes.h"
37 #include "queryobj.h"
38
39
40 static ALWAYS_INLINE void
begin_conditional_render(struct gl_context * ctx,GLuint queryId,GLenum mode,bool no_error)41 begin_conditional_render(struct gl_context *ctx, GLuint queryId, GLenum mode,
42 bool no_error)
43 {
44 struct gl_query_object *q = NULL;
45
46 assert(ctx->Query.CondRenderMode == GL_NONE);
47
48 if (queryId != 0)
49 q = _mesa_lookup_query_object(ctx, queryId);
50
51 if (!no_error) {
52 /* Section 2.14 (Conditional Rendering) of the OpenGL 3.0 spec says:
53 *
54 * "The error INVALID_VALUE is generated if <id> is not the name of an
55 * existing query object query."
56 */
57 if (!q) {
58 _mesa_error(ctx, GL_INVALID_VALUE,
59 "glBeginConditionalRender(bad queryId=%u)", queryId);
60 return;
61 }
62 assert(q->Id == queryId);
63
64 switch (mode) {
65 case GL_QUERY_WAIT:
66 case GL_QUERY_NO_WAIT:
67 case GL_QUERY_BY_REGION_WAIT:
68 case GL_QUERY_BY_REGION_NO_WAIT:
69 break; /* OK */
70 case GL_QUERY_WAIT_INVERTED:
71 case GL_QUERY_NO_WAIT_INVERTED:
72 case GL_QUERY_BY_REGION_WAIT_INVERTED:
73 case GL_QUERY_BY_REGION_NO_WAIT_INVERTED:
74 if (ctx->Extensions.ARB_conditional_render_inverted)
75 break; /* OK */
76 FALLTHROUGH;
77 default:
78 _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
79 _mesa_enum_to_string(mode));
80 return;
81 }
82
83 /* Section 2.14 (Conditional Rendering) of the OpenGL 3.0 spec says:
84 *
85 * "The error INVALID_OPERATION is generated if <id> is the name of a
86 * query object with a target other than SAMPLES_PASSED, or <id> is
87 * the name of a query currently in progress."
88 */
89 if ((q->Target != GL_SAMPLES_PASSED &&
90 q->Target != GL_ANY_SAMPLES_PASSED &&
91 q->Target != GL_ANY_SAMPLES_PASSED_CONSERVATIVE &&
92 q->Target != GL_TRANSFORM_FEEDBACK_STREAM_OVERFLOW_ARB &&
93 q->Target != GL_TRANSFORM_FEEDBACK_OVERFLOW_ARB) || q->Active) {
94 _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
95 return;
96 }
97 }
98
99 ctx->Query.CondRenderQuery = q;
100 ctx->Query.CondRenderMode = mode;
101
102 if (ctx->Driver.BeginConditionalRender)
103 ctx->Driver.BeginConditionalRender(ctx, q, mode);
104 }
105
106
107 void GLAPIENTRY
_mesa_BeginConditionalRender_no_error(GLuint queryId,GLenum mode)108 _mesa_BeginConditionalRender_no_error(GLuint queryId, GLenum mode)
109 {
110 GET_CURRENT_CONTEXT(ctx);
111 begin_conditional_render(ctx, queryId, mode, true);
112 }
113
114
115 void GLAPIENTRY
_mesa_BeginConditionalRender(GLuint queryId,GLenum mode)116 _mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
117 {
118 GET_CURRENT_CONTEXT(ctx);
119
120 /* Section 2.14 (Conditional Rendering) of the OpenGL 3.0 spec says:
121 *
122 * "If BeginConditionalRender is called while conditional rendering is
123 * in progress, or if EndConditionalRender is called while conditional
124 * rendering is not in progress, the error INVALID_OPERATION is
125 * generated."
126 */
127 if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery) {
128 _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
129 return;
130 }
131
132 begin_conditional_render(ctx, queryId, mode, false);
133 }
134
135
136 static void
end_conditional_render(struct gl_context * ctx)137 end_conditional_render(struct gl_context *ctx)
138 {
139 FLUSH_VERTICES(ctx, 0, 0);
140
141 if (ctx->Driver.EndConditionalRender)
142 ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
143
144 ctx->Query.CondRenderQuery = NULL;
145 ctx->Query.CondRenderMode = GL_NONE;
146 }
147
148
149 void APIENTRY
_mesa_EndConditionalRender_no_error(void)150 _mesa_EndConditionalRender_no_error(void)
151 {
152 GET_CURRENT_CONTEXT(ctx);
153 end_conditional_render(ctx);
154 }
155
156
157 void APIENTRY
_mesa_EndConditionalRender(void)158 _mesa_EndConditionalRender(void)
159 {
160 GET_CURRENT_CONTEXT(ctx);
161
162 if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
163 _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
164 return;
165 }
166
167 end_conditional_render(ctx);
168 }
169
170
171 /**
172 * This function is called by software rendering commands (all point,
173 * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
174 * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
175 * commands should be
176 * executed or discarded depending on the current conditional
177 * rendering state. Ideally, this check would be implemented by the
178 * GPU when doing hardware rendering. XXX should this function be
179 * called via a new driver hook?
180 *
181 * \return GL_TRUE if we should render, GL_FALSE if we should discard
182 */
183 GLboolean
_mesa_check_conditional_render(struct gl_context * ctx)184 _mesa_check_conditional_render(struct gl_context *ctx)
185 {
186 struct gl_query_object *q = ctx->Query.CondRenderQuery;
187
188 if (!q) {
189 /* no query in progress - draw normally */
190 return GL_TRUE;
191 }
192
193 switch (ctx->Query.CondRenderMode) {
194 case GL_QUERY_BY_REGION_WAIT:
195 FALLTHROUGH;
196 case GL_QUERY_WAIT:
197 if (!q->Ready) {
198 ctx->Driver.WaitQuery(ctx, q);
199 }
200 return q->Result > 0;
201 case GL_QUERY_BY_REGION_WAIT_INVERTED:
202 FALLTHROUGH;
203 case GL_QUERY_WAIT_INVERTED:
204 if (!q->Ready) {
205 ctx->Driver.WaitQuery(ctx, q);
206 }
207 return q->Result == 0;
208 case GL_QUERY_BY_REGION_NO_WAIT:
209 FALLTHROUGH;
210 case GL_QUERY_NO_WAIT:
211 if (!q->Ready)
212 ctx->Driver.CheckQuery(ctx, q);
213 return q->Ready ? (q->Result > 0) : GL_TRUE;
214 case GL_QUERY_BY_REGION_NO_WAIT_INVERTED:
215 FALLTHROUGH;
216 case GL_QUERY_NO_WAIT_INVERTED:
217 if (!q->Ready)
218 ctx->Driver.CheckQuery(ctx, q);
219 return q->Ready ? (q->Result == 0) : GL_TRUE;
220 default:
221 _mesa_problem(ctx, "Bad cond render mode %s in "
222 " _mesa_check_conditional_render()",
223 _mesa_enum_to_string(ctx->Query.CondRenderMode));
224 return GL_TRUE;
225 }
226 }
227