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