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      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 #include "main/mtypes.h"
     31 
     32 
     33 /**
     34  * Called via glSampleCoverageARB
     35  */
     36 void GLAPIENTRY
     37 _mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
     38 {
     39    GET_CURRENT_CONTEXT(ctx);
     40 
     41    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
     42 
     43    ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0);
     44    ctx->Multisample.SampleCoverageInvert = invert;
     45    ctx->NewState |= _NEW_MULTISAMPLE;
     46 }
     47 
     48 
     49 /**
     50  * Initialize the context's multisample state.
     51  * \param ctx  the GL context.
     52  */
     53 void
     54 _mesa_init_multisample(struct gl_context *ctx)
     55 {
     56    ctx->Multisample.Enabled = GL_TRUE;
     57    ctx->Multisample.SampleAlphaToCoverage = GL_FALSE;
     58    ctx->Multisample.SampleAlphaToOne = GL_FALSE;
     59    ctx->Multisample.SampleCoverage = GL_FALSE;
     60    ctx->Multisample.SampleCoverageValue = 1.0;
     61    ctx->Multisample.SampleCoverageInvert = GL_FALSE;
     62 }
     63