reactos/dll/3rdparty/mesa32/src/main/accum.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  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 #include "glheader.h"
  26 #include "accum.h"
  27 #include "context.h"
  28 #include "imports.h"
  29 #include "macros.h"
  30 #include "state.h"
  31 #include "mtypes.h"
  32
  33
  34 void GLAPIENTRY
  35 _mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
  36 {
  37    GLfloat tmp[4];
  38    GET_CURRENT_CONTEXT(ctx);
  39    ASSERT_OUTSIDE_BEGIN_END(ctx);
  40
  41    tmp[0] = CLAMP( red,   -1.0F, 1.0F );
  42    tmp[1] = CLAMP( green, -1.0F, 1.0F );
  43    tmp[2] = CLAMP( blue,  -1.0F, 1.0F );
  44    tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
  45
  46    if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
  47       return;
  48
  49    FLUSH_VERTICES(ctx, _NEW_ACCUM);
  50    COPY_4FV( ctx->Accum.ClearColor, tmp );
  51 }
  52
  53
  54 void GLAPIENTRY
  55 _mesa_Accum( GLenum op, GLfloat value )
  56 {
  57    GET_CURRENT_CONTEXT(ctx);
  58    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  59
  60    switch (op) {
  61    case GL_ADD:
  62    case GL_MULT:
  63    case GL_ACCUM:
  64    case GL_LOAD:
  65    case GL_RETURN:
  66       /* OK */
  67       break;
  68    default:
  69       _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
  70       return;
  71    }
  72
  73    if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
  74       _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
  75       return;
  76    }
  77
  78    if (ctx->DrawBuffer != ctx->ReadBuffer) {
  79       /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read */
  80       _mesa_error(ctx, GL_INVALID_OPERATION,
  81                   "glAccum(different read/draw buffers)");
  82       return;
  83    }
  84
  85    if (ctx->NewState)
  86       _mesa_update_state(ctx);
  87
  88    if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  89       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
  90                   "glAccum(incomplete framebuffer)");
  91       return;
  92    }
  93
  94    if (ctx->RenderMode == GL_RENDER) {
  95       GLint x = ctx->DrawBuffer->_Xmin;
  96       GLint y = ctx->DrawBuffer->_Ymin;
  97       GLint width =  ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
  98       GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
  99       ctx->Driver.Accum(ctx, op, value, x, y, width, height);
 100    }
 101 }
 102
 103
 104
 105 void
 106 _mesa_init_accum( GLcontext *ctx )
 107 {
 108    /* Accumulate buffer group */
 109    ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
 110 }