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/* $Id: s_buffers.c,v 1.7 2001/03/12 00:48:41 gareth Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 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 "macros.h"
#include "mem.h"
#include "s_accum.h"
#include "s_alphabuf.h"
#include "s_depth.h"
#include "s_masking.h"
#include "s_stencil.h"
/*
* Clear the color buffer when glColorMask or glIndexMask is in effect.
*/
static void
clear_color_buffer_with_masking( GLcontext *ctx )
{
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
if (ctx->Visual.rgbMode) {
/* RGBA mode */
const GLchan r = ctx->Color.ClearColor[0];
const GLchan g = ctx->Color.ClearColor[1];
const GLchan b = ctx->Color.ClearColor[2];
const GLchan a = ctx->Color.ClearColor[3];
GLint i;
for (i = 0; i < height; i++) {
GLchan rgba[MAX_WIDTH][4];
GLint j;
for (j = 0; j < width; j++) {
rgba[j][RCOMP] = r;
rgba[j][GCOMP] = g;
rgba[j][BCOMP] = b;
rgba[j][ACOMP] = a;
}
_mesa_mask_rgba_span( ctx, width, x, y + i, rgba );
(*ctx->Driver.WriteRGBASpan)( ctx, width, x, y + i,
(CONST GLchan (*)[4]) rgba, NULL );
}
}
else {
/* Color index mode */
GLuint span[MAX_WIDTH];
GLubyte mask[MAX_WIDTH];
GLint i, j;
MEMSET( mask, 1, width );
for (i=0;i<height;i++) {
for (j=0;j<width;j++) {
span[j] = ctx->Color.ClearIndex;
}
_mesa_mask_index_span( ctx, width, x, y + i, span );
(*ctx->Driver.WriteCI32Span)( ctx, width, x, y + i, span, mask );
}
}
}
/*
* Clear a color buffer without index/channel masking.
*/
static void
clear_color_buffer(GLcontext *ctx)
{
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
if (ctx->Visual.rgbMode) {
/* RGBA mode */
const GLchan r = ctx->Color.ClearColor[0];
const GLchan g = ctx->Color.ClearColor[1];
const GLchan b = ctx->Color.ClearColor[2];
const GLchan a = ctx->Color.ClearColor[3];
GLchan span[MAX_WIDTH][4];
GLint i;
ASSERT(*((GLuint *) &ctx->Color.ColorMask) == 0xffffffff);
for (i = 0; i < width; i++) {
span[i][RCOMP] = r;
span[i][GCOMP] = g;
span[i][BCOMP] = b;
span[i][ACOMP] = a;
}
for (i = 0; i < height; i++) {
(*ctx->Driver.WriteRGBASpan)( ctx, width, x, y + i,
(CONST GLchan (*)[4]) span, NULL );
}
}
else {
/* Color index mode */
ASSERT((ctx->Color.IndexMask & ((1 << ctx->Visual.indexBits) - 1))
== (GLuint) ((1 << ctx->Visual.indexBits) - 1));
if (ctx->Visual.indexBits == 8) {
/* 8-bit clear */
GLubyte span[MAX_WIDTH];
GLint i;
MEMSET(span, ctx->Color.ClearIndex, width);
for (i = 0; i < height; i++) {
(*ctx->Driver.WriteCI8Span)( ctx, width, x, y + i, span, NULL );
}
}
else {
/* non 8-bit clear */
GLuint span[MAX_WIDTH];
GLint i;
for (i = 0; i < width; i++) {
span[i] = ctx->Color.ClearIndex;
}
for (i = 0; i < height; i++) {
(*ctx->Driver.WriteCI32Span)( ctx, width, x, y + i, span, NULL );
}
}
}
}
/*
* Clear the front/back/left/right color buffers.
* This function is usually only called if we need to clear the
* buffers with masking.
*/
static void
clear_color_buffers(GLcontext *ctx)
{
const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
GLuint bufferBit;
/* loop over four possible dest color buffers */
for (bufferBit = 1; bufferBit <= 8; bufferBit = bufferBit << 1) {
if (bufferBit & ctx->Color.DrawDestMask) {
if (bufferBit == FRONT_LEFT_BIT) {
(void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_FRONT_LEFT);
(void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_FRONT_LEFT);
}
else if (bufferBit == FRONT_RIGHT_BIT) {
(void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_FRONT_RIGHT);
(void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_FRONT_RIGHT);
}
else if (bufferBit == BACK_LEFT_BIT) {
(void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_BACK_LEFT);
(void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_BACK_LEFT);
}
else {
(void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_BACK_RIGHT);
(void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_BACK_RIGHT);
}
if (colorMask != 0xffffffff) {
clear_color_buffer_with_masking(ctx);
}
else {
clear_color_buffer(ctx);
}
}
}
/* restore default read/draw buffers */
(void) (*ctx->Driver.SetDrawBuffer)( ctx, ctx->Color.DriverDrawBuffer );
(void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer, ctx->Pixel.DriverReadBuffer );
}
void
_swrast_Clear( GLcontext *ctx, GLbitfield mask,
GLboolean all,
GLint x, GLint y, GLint width, GLint height )
{
#ifdef DEBUG
{
GLbitfield legalBits = DD_FRONT_LEFT_BIT |
DD_FRONT_RIGHT_BIT |
DD_BACK_LEFT_BIT |
DD_BACK_RIGHT_BIT |
DD_DEPTH_BIT |
DD_STENCIL_BIT |
DD_ACCUM_BIT;
assert((mask & (~legalBits)) == 0);
}
#endif
RENDER_START(ctx);
/* do software clearing here */
if (mask) {
if (mask & ctx->Color.DrawDestMask) clear_color_buffers(ctx);
if (mask & GL_DEPTH_BUFFER_BIT) _mesa_clear_depth_buffer(ctx);
if (mask & GL_ACCUM_BUFFER_BIT) _mesa_clear_accum_buffer(ctx);
if (mask & GL_STENCIL_BUFFER_BIT) _mesa_clear_stencil_buffer(ctx);
}
/* clear software-based alpha buffer(s) */
if ( (mask & GL_COLOR_BUFFER_BIT)
&& ctx->DrawBuffer->UseSoftwareAlphaBuffers
&& ctx->Color.ColorMask[ACOMP]) {
_mesa_clear_alpha_buffers( ctx );
}
RENDER_FINISH(ctx);
}
void
_swrast_alloc_buffers( GLcontext *ctx )
{
/* Reallocate other buffers if needed. */
if (ctx->DrawBuffer->UseSoftwareDepthBuffer) {
_mesa_alloc_depth_buffer( ctx );
}
if (ctx->DrawBuffer->UseSoftwareStencilBuffer) {
_mesa_alloc_stencil_buffer( ctx );
}
if (ctx->DrawBuffer->UseSoftwareAccumBuffer) {
_mesa_alloc_accum_buffer( ctx );
}
if (ctx->DrawBuffer->UseSoftwareAlphaBuffers) {
_mesa_alloc_alpha_buffers( ctx );
}
}
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