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;
  44    GET_CURRENT_CONTEXT(ctx);
  45
  46    if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery ||
  47        queryId == 0) {
  48       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
  49       return;
  50    }
  51
  52    ASSERT(ctx->Query.CondRenderMode == GL_NONE);
  53
  54    switch (mode) {
  55    case GL_QUERY_WAIT:
  56    case GL_QUERY_NO_WAIT:
  57    case GL_QUERY_BY_REGION_WAIT:
  58    case GL_QUERY_BY_REGION_NO_WAIT:
  59       /* OK */
  60       break;
  61    default:
  62       _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
  63                   _mesa_lookup_enum_by_nr(mode));
  64       return;
  65    }
  66
  67    q = _mesa_lookup_query_object(ctx, queryId);
  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    if ((q->Target != GL_SAMPLES_PASSED &&
  76         q->Target != GL_ANY_SAMPLES_PASSED &&
  77         q->Target != GL_ANY_SAMPLES_PASSED_CONSERVATIVE) || q->Active) {
  78       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
  79       return;
  80    }
  81
  82    ctx->Query.CondRenderQuery = q;
  83    ctx->Query.CondRenderMode = mode;
  84
  85    if (ctx->Driver.BeginConditionalRender)
  86       ctx->Driver.BeginConditionalRender(ctx, q, mode);
  87 }
  88
  89
  90 void APIENTRY
  91 _mesa_EndConditionalRender(void)
  92 {
  93    GET_CURRENT_CONTEXT(ctx);
  94
  95    FLUSH_VERTICES(ctx, 0x0);
  96
  97    if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
  98       _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
  99       return;
 100    }
 101
 102    if (ctx->Driver.EndConditionalRender)
 103       ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
 104
 105    ctx->Query.CondRenderQuery = NULL;
 106    ctx->Query.CondRenderMode = GL_NONE;
 107 }
 108
 109
 110 /**
 111  * This function is called by software rendering commands (all point,
 112  * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
 113  * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
 114  * commands should be
 115  * executed or discarded depending on the current conditional
 116  * rendering state.  Ideally, this check would be implemented by the
 117  * GPU when doing hardware rendering.  XXX should this function be
 118  * called via a new driver hook?
 119  *
 120  * \return GL_TRUE if we should render, GL_FALSE if we should discard
 121  */
 122 GLboolean
 123 _mesa_check_conditional_render(struct gl_context *ctx)
 124 {
 125    struct gl_query_object *q = ctx->Query.CondRenderQuery;
 126
 127    if (!q) {
 128       /* no query in progress - draw normally */
 129       return GL_TRUE;
 130    }
 131
 132    switch (ctx->Query.CondRenderMode) {
 133    case GL_QUERY_BY_REGION_WAIT:
 134       /* fall-through */
 135    case GL_QUERY_WAIT:
 136       if (!q->Ready) {
 137          ctx->Driver.WaitQuery(ctx, q);
 138       }
 139       return q->Result > 0;
 140    case GL_QUERY_BY_REGION_NO_WAIT:
 141       /* fall-through */
 142    case GL_QUERY_NO_WAIT:
 143       if (!q->Ready)
 144          ctx->Driver.CheckQuery(ctx, q);
 145       return q->Ready ? (q->Result > 0) : GL_TRUE;
 146    default:
 147       _mesa_problem(ctx, "Bad cond render mode %s in "
 148                     " _mesa_check_conditional_render()",
 149                     _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
 150       return GL_TRUE;
 151    }
 152 }