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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 = 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.       break; /* OK */
  81.    case GL_QUERY_WAIT_INVERTED:
  82.    case GL_QUERY_NO_WAIT_INVERTED:
  83.    case GL_QUERY_BY_REGION_WAIT_INVERTED:
  84.    case GL_QUERY_BY_REGION_NO_WAIT_INVERTED:
  85.       if (ctx->Extensions.ARB_conditional_render_inverted)
  86.          break; /* OK */
  87.       /* fallthrough - invalid */
  88.    default:
  89.       _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
  90.                   _mesa_lookup_enum_by_nr(mode));
  91.       return;
  92.    }
  93.  
  94.    /* Section 2.14 (Conditional Rendering) of the OpenGL 3.0 spec says:
  95.     *
  96.     *     "The error INVALID_OPERATION is generated if <id> is the name of a
  97.     *     query object with a target other than SAMPLES_PASSED, or <id> is the
  98.     *     name of a query currently in progress."
  99.     */
  100.    if ((q->Target != GL_SAMPLES_PASSED &&
  101.         q->Target != GL_ANY_SAMPLES_PASSED &&
  102.         q->Target != GL_ANY_SAMPLES_PASSED_CONSERVATIVE) || q->Active) {
  103.       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
  104.       return;
  105.    }
  106.  
  107.    ctx->Query.CondRenderQuery = q;
  108.    ctx->Query.CondRenderMode = mode;
  109.  
  110.    if (ctx->Driver.BeginConditionalRender)
  111.       ctx->Driver.BeginConditionalRender(ctx, q, mode);
  112. }
  113.  
  114.  
  115. void APIENTRY
  116. _mesa_EndConditionalRender(void)
  117. {
  118.    GET_CURRENT_CONTEXT(ctx);
  119.  
  120.    FLUSH_VERTICES(ctx, 0x0);
  121.  
  122.    if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
  123.       _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
  124.       return;
  125.    }
  126.  
  127.    if (ctx->Driver.EndConditionalRender)
  128.       ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
  129.  
  130.    ctx->Query.CondRenderQuery = NULL;
  131.    ctx->Query.CondRenderMode = GL_NONE;
  132. }
  133.  
  134.  
  135. /**
  136.  * This function is called by software rendering commands (all point,
  137.  * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
  138.  * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
  139.  * commands should be
  140.  * executed or discarded depending on the current conditional
  141.  * rendering state.  Ideally, this check would be implemented by the
  142.  * GPU when doing hardware rendering.  XXX should this function be
  143.  * called via a new driver hook?
  144.  *
  145.  * \return GL_TRUE if we should render, GL_FALSE if we should discard
  146.  */
  147. GLboolean
  148. _mesa_check_conditional_render(struct gl_context *ctx)
  149. {
  150.    struct gl_query_object *q = ctx->Query.CondRenderQuery;
  151.  
  152.    if (!q) {
  153.       /* no query in progress - draw normally */
  154.       return GL_TRUE;
  155.    }
  156.  
  157.    switch (ctx->Query.CondRenderMode) {
  158.    case GL_QUERY_BY_REGION_WAIT:
  159.       /* fall-through */
  160.    case GL_QUERY_WAIT:
  161.       if (!q->Ready) {
  162.          ctx->Driver.WaitQuery(ctx, q);
  163.       }
  164.       return q->Result > 0;
  165.    case GL_QUERY_BY_REGION_WAIT_INVERTED:
  166.       /* fall-through */
  167.    case GL_QUERY_WAIT_INVERTED:
  168.       if (!q->Ready) {
  169.          ctx->Driver.WaitQuery(ctx, q);
  170.       }
  171.       return q->Result == 0;
  172.    case GL_QUERY_BY_REGION_NO_WAIT:
  173.       /* fall-through */
  174.    case GL_QUERY_NO_WAIT:
  175.       if (!q->Ready)
  176.          ctx->Driver.CheckQuery(ctx, q);
  177.       return q->Ready ? (q->Result > 0) : GL_TRUE;
  178.    case GL_QUERY_BY_REGION_NO_WAIT_INVERTED:
  179.       /* fall-through */
  180.    case GL_QUERY_NO_WAIT_INVERTED:
  181.       if (!q->Ready)
  182.          ctx->Driver.CheckQuery(ctx, q);
  183.       return q->Ready ? (q->Result == 0) : GL_TRUE;
  184.    default:
  185.       _mesa_problem(ctx, "Bad cond render mode %s in "
  186.                     " _mesa_check_conditional_render()",
  187.                     _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
  188.       return GL_TRUE;
  189.    }
  190. }
  191.