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  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. 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. void 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.  */
  119. GLboolean
  120. _mesa_check_conditional_render(struct gl_context *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.