src/mesa/main/condrender.c

   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
  40 GLAPI void 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
  87 GLAPI void APIENTRY
  88 _mesa_EndConditionalRender(void)
  89 {
  90    GET_CURRENT_CONTEXT(ctx);
  91
  92    if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
  93       _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
  94       return;
  95    }
  96
  97    if (ctx->Driver.EndConditionalRender)
  98       ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
  99
 100    ctx->Query.CondRenderQuery = NULL;
 101    ctx->Query.CondRenderMode = GL_NONE;
 102 }
 103
 104
 105 /**
 106  * This function is called by software rendering commands to determine if
 107  * subsequent drawing commands should be executed or discarded depending
 108  * on the current conditional rendering state.
 109  * Ideally, this check would be implemented by the GPU when doing hardware
 110  * rendering.
 111  * XXX should this function be called via a new driver hook?
 112  *
 113  * \return GL_TRUE if we should render, GL_FALSE if we should discard
 114  */
 115 GLboolean
 116 _mesa_check_conditional_render(GLcontext *ctx)
 117 {
 118    struct gl_query_object *q = ctx->Query.CondRenderQuery;
 119
 120    if (!q) {
 121       /* no query in progress - draw normally */
 122       return GL_TRUE;
 123    }
 124
 125    switch (ctx->Query.CondRenderMode) {
 126    case GL_QUERY_BY_REGION_WAIT:
 127       /* fall-through */
 128    case GL_QUERY_WAIT:
 129       if (!q->Ready) {
 130          ctx->Driver.WaitQuery(ctx, q);
 131       }
 132       return q->Result > 0;
 133    case GL_QUERY_BY_REGION_NO_WAIT:
 134       /* fall-through */
 135    case GL_QUERY_NO_WAIT:
 136       return q->Ready ? (q->Result > 0) : GL_TRUE;
 137    default:
 138       _mesa_problem(ctx, "Bad cond render mode %s in "
 139                     " _mesa_check_conditional_render()",
 140                     _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
 141       return GL_TRUE;
 142    }
 143 }