src/mesa/main/condrender.c

   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 void GLAPIENTRY
  41 _mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
  42 {
  43    struct gl_query_object *q = NULL;
  44    GET_CURRENT_CONTEXT(ctx);
  45
  46    /* Section 2.14 (Conditional Rendering) of the OpenGL 3.0 spec says:
  47     *
  48     *     "If BeginConditionalRender is called while conditional rendering is
  49     *     in progress, or if EndConditionalRender is called while conditional
  50     *     rendering is not in progress, the error INVALID_OPERATION is
  51     *     generated."
  52     */
  53    if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery) {
  54       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
  55       return;
  56    }
  57
  58    ASSERT(ctx->Query.CondRenderMode == GL_NONE);
  59
  60    /* Section 2.14 (Conditional Rendering) of the OpenGL 3.0 spec says:
  61     *
  62     *     "The error INVALID_VALUE is generated if <id> is not the name of an
  63     *     existing query object query."
  64     */
  65    if (queryId != 0)
  66       q = _mesa_lookup_query_object(ctx, queryId);
  67
  68    if (!q) {
  69       _mesa_error(ctx, GL_INVALID_VALUE,
  70                   "glBeginConditionalRender(bad queryId=%u)", queryId);
  71       return;
  72    }
  73    ASSERT(q->Id == queryId);
  74
  75    switch (mode) {
  76    case GL_QUERY_WAIT:
  77    case GL_QUERY_NO_WAIT:
  78    case GL_QUERY_BY_REGION_WAIT:
  79    case GL_QUERY_BY_REGION_NO_WAIT:
  80       /* OK */
  81       break;
  82    default:
  83       _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
  84                   _mesa_lookup_enum_by_nr(mode));
  85       return;
  86    }
  87
  88    /* Section 2.14 (Conditional Rendering) of the OpenGL 3.0 spec says:
  89     *
  90     *     "The error INVALID_OPERATION is generated if <id> is the name of a
  91     *     query object with a target other than SAMPLES_PASSED, or <id> is the
  92     *     name of a query currently in progress."
  93     */
  94    if ((q->Target != GL_SAMPLES_PASSED &&
  95         q->Target != GL_ANY_SAMPLES_PASSED &&
  96         q->Target != GL_ANY_SAMPLES_PASSED_CONSERVATIVE) || q->Active) {
  97       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
  98       return;
  99    }
 100
 101    ctx->Query.CondRenderQuery = q;
 102    ctx->Query.CondRenderMode = mode;
 103
 104    if (ctx->Driver.BeginConditionalRender)
 105       ctx->Driver.BeginConditionalRender(ctx, q, mode);
 106 }
 107
 108
 109 void APIENTRY
 110 _mesa_EndConditionalRender(void)
 111 {
 112    GET_CURRENT_CONTEXT(ctx);
 113
 114    FLUSH_VERTICES(ctx, 0x0);
 115
 116    if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
 117       _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
 118       return;
 119    }
 120
 121    if (ctx->Driver.EndConditionalRender)
 122       ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
 123
 124    ctx->Query.CondRenderQuery = NULL;
 125    ctx->Query.CondRenderMode = GL_NONE;
 126 }
 127
 128
 129 /**
 130  * This function is called by software rendering commands (all point,
 131  * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
 132  * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
 133  * commands should be
 134  * executed or discarded depending on the current conditional
 135  * rendering state.  Ideally, this check would be implemented by the
 136  * GPU when doing hardware rendering.  XXX should this function be
 137  * called via a new driver hook?
 138  *
 139  * \return GL_TRUE if we should render, GL_FALSE if we should discard
 140  */
 141 GLboolean
 142 _mesa_check_conditional_render(struct gl_context *ctx)
 143 {
 144    struct gl_query_object *q = ctx->Query.CondRenderQuery;
 145
 146    if (!q) {
 147       /* no query in progress - draw normally */
 148       return GL_TRUE;
 149    }
 150
 151    switch (ctx->Query.CondRenderMode) {
 152    case GL_QUERY_BY_REGION_WAIT:
 153       /* fall-through */
 154    case GL_QUERY_WAIT:
 155       if (!q->Ready) {
 156          ctx->Driver.WaitQuery(ctx, q);
 157       }
 158       return q->Result > 0;
 159    case GL_QUERY_BY_REGION_NO_WAIT:
 160       /* fall-through */
 161    case GL_QUERY_NO_WAIT:
 162       if (!q->Ready)
 163          ctx->Driver.CheckQuery(ctx, q);
 164       return q->Ready ? (q->Result > 0) : GL_TRUE;
 165    default:
 166       _mesa_problem(ctx, "Bad cond render mode %s in "
 167                     " _mesa_check_conditional_render()",
 168                     _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
 169       return GL_TRUE;
 170    }
 171 }