reactos/dll/opengl/mesa/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 "mtypes.h"
  38 #include "queryobj.h"
  39
  40
  41 void GLAPIENTRY
  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
  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
 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       return q->Ready ? (q->Result > 0) : GL_TRUE;
 143    default:
 144       _mesa_problem(ctx, "Bad cond render mode %s in "
 145                     " _mesa_check_conditional_render()",
 146                     _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
 147       return GL_TRUE;
 148    }
 149 }