src/mesa/main/multisample.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   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 shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #include "main/glheader.h"
  27 #include "main/context.h"
  28 #include "main/macros.h"
  29 #include "main/multisample.h"
  30
  31
  32 /**
  33  * Called via glSampleCoverageARB
  34  */
  35 void GLAPIENTRY
  36 _mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
  37 {
  38    GET_CURRENT_CONTEXT(ctx);
  39
  40    if (!ctx->Extensions.ARB_multisample) {
  41       _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB");
  42       return;
  43    }
  44
  45    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
  46
  47    ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0);
  48    ctx->Multisample.SampleCoverageInvert = invert;
  49    ctx->NewState |= _NEW_MULTISAMPLE;
  50 }
  51
  52
  53 /**
  54  * Initialize the context's multisample state.
  55  * \param ctx  the GL context.
  56  */
  57 void
  58 _mesa_init_multisample(GLcontext *ctx)
  59 {
  60    ctx->Multisample.Enabled = GL_TRUE;
  61    ctx->Multisample.SampleAlphaToCoverage = GL_FALSE;
  62    ctx->Multisample.SampleAlphaToOne = GL_FALSE;
  63    ctx->Multisample.SampleCoverage = GL_FALSE;
  64    ctx->Multisample.SampleCoverageValue = 1.0;
  65    ctx->Multisample.SampleCoverageInvert = GL_FALSE;
  66 }