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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 "mtypes.h"
     38 #include "queryobj.h"
     39 
     40 
     41 void GLAPIENTRY
     42 _mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
     43 {
     44    struct gl_query_object *q;
     45    GET_CURRENT_CONTEXT(ctx);
     46 
     47    if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery ||
     48        queryId == 0) {
     49       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
     50       return;
     51    }
     52 
     53    ASSERT(ctx->Query.CondRenderMode == GL_NONE);
     54 
     55    switch (mode) {
     56    case GL_QUERY_WAIT:
     57    case GL_QUERY_NO_WAIT:
     58    case GL_QUERY_BY_REGION_WAIT:
     59    case GL_QUERY_BY_REGION_NO_WAIT:
     60       /* OK */
     61       break;
     62    default:
     63       _mesa_error(ctx, GL_INVALID_ENUM, "glBeginConditionalRender(mode=%s)",
     64                   _mesa_lookup_enum_by_nr(mode));
     65       return;
     66    }
     67 
     68    q = _mesa_lookup_query_object(ctx, queryId);
     69    if (!q) {
     70       _mesa_error(ctx, GL_INVALID_VALUE,
     71                   "glBeginConditionalRender(bad queryId=%u)", queryId);
     72       return;
     73    }
     74    ASSERT(q->Id == queryId);
     75 
     76    if (q->Target != GL_SAMPLES_PASSED || q->Active) {
     77       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
     78       return;
     79    }
     80 
     81    ctx->Query.CondRenderQuery = q;
     82    ctx->Query.CondRenderMode = mode;
     83 
     84    if (ctx->Driver.BeginConditionalRender)
     85       ctx->Driver.BeginConditionalRender(ctx, q, mode);
     86 }
     87 
     88 
     89 void APIENTRY
     90 _mesa_EndConditionalRender(void)
     91 {
     92    GET_CURRENT_CONTEXT(ctx);
     93 
     94    FLUSH_VERTICES(ctx, 0x0);
     95 
     96    if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
     97       _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
     98       return;
     99    }
    100 
    101    if (ctx->Driver.EndConditionalRender)
    102       ctx->Driver.EndConditionalRender(ctx, ctx->Query.CondRenderQuery);
    103 
    104    ctx->Query.CondRenderQuery = NULL;
    105    ctx->Query.CondRenderMode = GL_NONE;
    106 }
    107 
    108 
    109 /**
    110  * This function is called by software rendering commands (all point,
    111  * line triangle drawing, glClear, glDrawPixels, glCopyPixels, and
    112  * glBitmap, glBlitFramebuffer) to determine if subsequent drawing
    113  * commands should be
    114  * executed or discarded depending on the current conditional
    115  * rendering state.  Ideally, this check would be implemented by the
    116  * GPU when doing hardware rendering.  XXX should this function be
    117  * called via a new driver hook?
    118  *
    119  * \return GL_TRUE if we should render, GL_FALSE if we should discard
    120  */
    121 GLboolean
    122 _mesa_check_conditional_render(struct gl_context *ctx)
    123 {
    124    struct gl_query_object *q = ctx->Query.CondRenderQuery;
    125 
    126    if (!q) {
    127       /* no query in progress - draw normally */
    128       return GL_TRUE;
    129    }
    130 
    131    switch (ctx->Query.CondRenderMode) {
    132    case GL_QUERY_BY_REGION_WAIT:
    133       /* fall-through */
    134    case GL_QUERY_WAIT:
    135       if (!q->Ready) {
    136          ctx->Driver.WaitQuery(ctx, q);
    137       }
    138       return q->Result > 0;
    139    case GL_QUERY_BY_REGION_NO_WAIT:
    140       /* fall-through */
    141    case GL_QUERY_NO_WAIT:
    142       if (!q->Ready)
    143          ctx->Driver.CheckQuery(ctx, q);
    144       return q->Ready ? (q->Result > 0) : GL_TRUE;
    145    default:
    146       _mesa_problem(ctx, "Bad cond render mode %s in "
    147                     " _mesa_check_conditional_render()",
    148                     _mesa_lookup_enum_by_nr(ctx->Query.CondRenderMode));
    149       return GL_TRUE;
    150    }
    151 }
    152