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/*
* Mesa 3-D graphics library
* Version: 7.1
*
* Copyright (C) 1999-2007 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.
*/
/**
* \file clear.c
* glClearColor, glClearIndex, glClear() functions.
*/
#include "glheader.h"
#include "clear.h"
#include "context.h"
#include "colormac.h"
#include "state.h"
#if _HAVE_FULL_GL
void GLAPIENTRY
_mesa_ClearIndex( GLfloat c )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (ctx->Color.ClearIndex == (GLuint) c)
return;
FLUSH_VERTICES(ctx, _NEW_COLOR);
ctx->Color.ClearIndex = (GLuint) c;
if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) {
/* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
(*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex );
}
}
#endif
/**
* Specify the clear values for the color buffers.
*
* \param red red color component.
* \param green green color component.
* \param blue blue color component.
* \param alpha alpha component.
*
* \sa glClearColor().
*
* Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a
* change, flushes the vertices and notifies the driver via the
* dd_function_table::ClearColor callback.
*/
void GLAPIENTRY
_mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
{
GLfloat tmp[4];
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END(ctx);
tmp[0] = CLAMP(red, 0.0F, 1.0F);
tmp[1] = CLAMP(green, 0.0F, 1.0F);
tmp[2] = CLAMP(blue, 0.0F, 1.0F);
tmp[3] = CLAMP(alpha, 0.0F, 1.0F);
if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
return; /* no change */
FLUSH_VERTICES(ctx, _NEW_COLOR);
COPY_4V(ctx->Color.ClearColor, tmp);
if (ctx->Visual.rgbMode && ctx->Driver.ClearColor) {
/* it's OK to call glClearColor in CI mode but it should be a NOP */
(*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
}
}
/**
* Clear buffers.
*
* \param mask bit-mask indicating the buffers to be cleared.
*
* Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState
* is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
* etc. If the rasterization mode is set to GL_RENDER then requests the driver
* to clear the buffers, via the dd_function_table::Clear callback.
*/
void GLAPIENTRY
_mesa_Clear( GLbitfield mask )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
FLUSH_CURRENT(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glClear 0x%x\n", mask);
if (mask & ~(GL_COLOR_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT |
GL_STENCIL_BUFFER_BIT |
GL_ACCUM_BUFFER_BIT)) {
/* invalid bit set */
_mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask);
return;
}
if (ctx->NewState) {
_mesa_update_state( ctx ); /* update _Xmin, etc */
}
if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
_mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
"glClear(incomplete framebuffer)");
return;
}
if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0 ||
ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax ||
ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax)
return;
if (ctx->RenderMode == GL_RENDER) {
GLbitfield bufferMask;
/* don't clear depth buffer if depth writing disabled */
if (!ctx->Depth.Mask)
mask &= ~GL_DEPTH_BUFFER_BIT;
/* Build the bitmask to send to device driver's Clear function.
* Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
* of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
* BUFFER_BIT_COLORn flags.
*/
bufferMask = 0;
if (mask & GL_COLOR_BUFFER_BIT) {
GLuint i;
for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndexes[i]);
}
}
if ((mask & GL_DEPTH_BUFFER_BIT)
&& ctx->DrawBuffer->Visual.haveDepthBuffer) {
bufferMask |= BUFFER_BIT_DEPTH;
}
if ((mask & GL_STENCIL_BUFFER_BIT)
&& ctx->DrawBuffer->Visual.haveStencilBuffer) {
bufferMask |= BUFFER_BIT_STENCIL;
}
if ((mask & GL_ACCUM_BUFFER_BIT)
&& ctx->DrawBuffer->Visual.haveAccumBuffer) {
bufferMask |= BUFFER_BIT_ACCUM;
}
ASSERT(ctx->Driver.Clear);
ctx->Driver.Clear(ctx, bufferMask);
}
}
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