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/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glheader.h"
#include "accum.h"
#include "context.h"
#include "imports.h"
#include "macros.h"
#include "state.h"
#include "mtypes.h"
void GLAPIENTRY
_mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
{
GLfloat tmp[4];
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
tmp[0] = CLAMP( red, -1.0F, 1.0F );
tmp[1] = CLAMP( green, -1.0F, 1.0F );
tmp[2] = CLAMP( blue, -1.0F, 1.0F );
tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
return;
FLUSH_VERTICES(ctx, _NEW_ACCUM);
COPY_4FV( ctx->Accum.ClearColor, tmp );
}
void GLAPIENTRY
_mesa_Accum( GLenum op, GLfloat value )
{
GET_CURRENT_CONTEXT(ctx);
GLuint xpos, ypos, width, height;
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
switch (op) {
case GL_ADD:
case GL_MULT:
case GL_ACCUM:
case GL_LOAD:
case GL_RETURN:
/* OK */
break;
default:
_mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
return;
}
if (ctx->Visual.accumRedBits == 0) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
return;
}
if (ctx->DrawBuffer != ctx->ReadBuffer) {
/* See GLX_SGI_make_current_read or WGL_ARB_make_current_read */
_mesa_error(ctx, GL_INVALID_OPERATION,
"glAccum(different read/draw buffers)");
return;
}
if (ctx->NewState)
_mesa_update_state( ctx );
if (ctx->RenderMode != GL_RENDER) {
/* no-op */
return;
}
/* Determine region to operate upon. */
if (ctx->Scissor.Enabled) {
xpos = ctx->Scissor.X;
ypos = ctx->Scissor.Y;
width = ctx->Scissor.Width;
height = ctx->Scissor.Height;
}
else {
/* whole window */
xpos = 0;
ypos = 0;
width = ctx->DrawBuffer->Width;
height = ctx->DrawBuffer->Height;
}
ctx->Driver.Accum( ctx, op, value, xpos, ypos, width, height );
}
void
_mesa_init_accum( GLcontext *ctx )
{
/* Accumulate buffer group */
ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
}
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