condrender.c revision cdc920a0 
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 "queryobj.h"
38
39
40void GLAPIENTRY
41_mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
42{
43   struct gl_query_object *q;
44   GET_CURRENT_CONTEXT(ctx);
45
46   if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery) {
47      _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
48      return;
49   }
50
51   ASSERT(ctx->Query.CondRenderMode == GL_NONE);
52
53   switch (mode) {
54   case GL_QUERY_WAIT:
55   case GL_QUERY_NO_WAIT:
56   case GL_QUERY_BY_REGION_WAIT:
57   case GL_QUERY_BY_REGION_NO_WAIT:
58      /* OK */
59      break;
60   default:
61      _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
62                  _mesa_lookup_enum_by_nr(mode));
63      return;
64   }
65
66   q = _mesa_lookup_query_object(ctx, queryId);
67   if (!q) {
68      _mesa_error(ctx, GL_INVALID_VALUE,
69                  "glBeginConditionalRender(bad queryId=%u)", queryId);
70      return;
71   }
72   ASSERT(q->Id == queryId);
73
74   if (q->Target != GL_SAMPLES_PASSED) {
75      _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
76      return;
77   }
78
79   ctx->Query.CondRenderQuery = q;
80   ctx->Query.CondRenderMode = mode;
81
82   if (ctx->Driver.BeginConditionalRender)
83      ctx->Driver.BeginConditionalRender(ctx, q, mode);
84}
85
86
87void APIENTRY
88_mesa_EndConditionalRender(void)
89{
90   GET_CURRENT_CONTEXT(ctx);
91
92   FLUSH_VERTICES(ctx, 0x0);
93
94   if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
95      _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
96      return;
97   }
98
99   if (ctx->Driver.EndConditionalRender)
100      ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
101
102   ctx->Query.CondRenderQuery = NULL;
103   ctx->Query.CondRenderMode = GL_NONE;
104}
105
106
107/**
108 * This function is called by software rendering commands (all point,
109 * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
110 * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
111 * commands should be
112 * executed or discarded depending on the current conditional
113 * rendering state.  Ideally, this check would be implemented by the
114 * GPU when doing hardware rendering.  XXX should this function be
115 * called via a new driver hook?
116 *
117 * \return GL_TRUE if we should render, GL_FALSE if we should discard
118 */
119GLboolean
120_mesa_check_conditional_render(GLcontext *ctx)
121{
122   struct gl_query_object *q = ctx->Query.CondRenderQuery;
123
124   if (!q) {
125      /* no query in progress - draw normally */
126      return GL_TRUE;
127   }
128
129   switch (ctx->Query.CondRenderMode) {
130   case GL_QUERY_BY_REGION_WAIT:
131      /* fall-through */
132   case GL_QUERY_WAIT:
133      if (!q->Ready) {
134         ctx->Driver.WaitQuery(ctx, q);
135      }
136      return q->Result > 0;
137   case GL_QUERY_BY_REGION_NO_WAIT:
138      /* fall-through */
139   case GL_QUERY_NO_WAIT:
140      return q->Ready ? (q->Result > 0) : GL_TRUE;
141   default:
142      _mesa_problem(ctx, "Bad cond render mode %s in "
143                    " _mesa_check_conditional_render()",
144                    _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
145      return GL_TRUE;
146   }
147}
148