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/*
* Mesa 3-D graphics library
* Version: 7.1
*
* Copyright (C) 1999-2008 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 "main/glheader.h"
#include "main/colormac.h"
#include "main/condrender.h"
#include "main/macros.h"
#include "main/imports.h"
#include "main/mtypes.h"
#include "s_accum.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_masking.h"
#include "s_stencil.h"
/**
* Clear the color buffer when glColorMask is in effect.
*/
static void
clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb,
GLuint buf)
{
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;
SWspan span;
GLint i;
ASSERT(rb->PutRow);
/* Initialize color span with clear color */
/* XXX optimize for clearcolor == black/zero (bzero) */
INIT_SPAN(span, GL_BITMAP);
span.end = width;
span.arrayMask = SPAN_RGBA;
span.array->ChanType = rb->DataType;
if (span.array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte clearColor[4];
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[RCOMP], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[GCOMP], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[BCOMP], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < width; i++) {
COPY_4UBV(span.array->rgba[i], clearColor);
}
}
else if (span.array->ChanType == GL_UNSIGNED_SHORT) {
GLushort clearColor[4];
UNCLAMPED_FLOAT_TO_USHORT(clearColor[RCOMP], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[GCOMP], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[BCOMP], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < width; i++) {
COPY_4V_CAST(span.array->rgba[i], clearColor, GLchan);
}
}
else {
ASSERT(span.array->ChanType == GL_FLOAT);
for (i = 0; i < width; i++) {
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][0], ctx->Color.ClearColor[0]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][1], ctx->Color.ClearColor[1]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][2], ctx->Color.ClearColor[2]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][3], ctx->Color.ClearColor[3]);
}
}
/* Note that masking will change the color values, but only the
* channels for which the write mask is GL_FALSE. The channels
* which which are write-enabled won't get modified.
*/
for (i = 0; i < height; i++) {
span.x = x;
span.y = y + i;
_swrast_mask_rgba_span(ctx, rb, &span, buf);
/* write masked row */
rb->PutRow(ctx, rb, width, x, y + i, span.array->rgba, NULL);
}
}
/**
* Clear an rgba color buffer without channel masking.
*/
static void
clear_rgba_buffer(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint buf)
{
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;
GLubyte clear8[4];
GLushort clear16[4];
GLvoid *clearVal;
GLint i;
ASSERT(ctx->Color.ColorMask[buf][0] &&
ctx->Color.ColorMask[buf][1] &&
ctx->Color.ColorMask[buf][2] &&
ctx->Color.ColorMask[buf][3]);
ASSERT(rb->PutMonoRow);
switch (rb->DataType) {
case GL_UNSIGNED_BYTE:
UNCLAMPED_FLOAT_TO_UBYTE(clear8[0], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_UBYTE(clear8[1], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_UBYTE(clear8[2], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_UBYTE(clear8[3], ctx->Color.ClearColor[3]);
clearVal = clear8;
break;
case GL_UNSIGNED_SHORT:
UNCLAMPED_FLOAT_TO_USHORT(clear16[0], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_USHORT(clear16[1], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_USHORT(clear16[2], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_USHORT(clear16[3], ctx->Color.ClearColor[3]);
clearVal = clear16;
break;
case GL_FLOAT:
clearVal = ctx->Color.ClearColor;
break;
default:
_mesa_problem(ctx, "Bad rb DataType in clear_color_buffer");
return;
}
for (i = 0; i < height; i++) {
rb->PutMonoRow(ctx, rb, width, x, y + i, clearVal, NULL);
}
}
/**
* Clear the front/back/left/right/aux color buffers.
* This function is usually only called if the device driver can't
* clear its own color buffers for some reason (such as with masking).
*/
static void
clear_color_buffers(GLcontext *ctx)
{
GLuint buf;
for (buf = 0; buf < ctx->DrawBuffer->_NumColorDrawBuffers; buf++) {
struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[buf];
if (ctx->Color.ColorMask[buf][0] == 0 ||
ctx->Color.ColorMask[buf][1] == 0 ||
ctx->Color.ColorMask[buf][2] == 0 ||
ctx->Color.ColorMask[buf][3] == 0) {
clear_rgba_buffer_with_masking(ctx, rb, buf);
}
else {
clear_rgba_buffer(ctx, rb, buf);
}
}
}
/**
* Called via the device driver's ctx->Driver.Clear() function if the
* device driver can't clear one or more of the buffers itself.
* \param buffers bitfield of BUFFER_BIT_* values indicating which
* renderbuffers are to be cleared.
* \param all if GL_TRUE, clear whole buffer, else clear specified region.
*/
void
_swrast_Clear(GLcontext *ctx, GLbitfield buffers)
{
#ifdef DEBUG_FOO
{
const GLbitfield legalBits =
BUFFER_BIT_FRONT_LEFT |
BUFFER_BIT_FRONT_RIGHT |
BUFFER_BIT_BACK_LEFT |
BUFFER_BIT_BACK_RIGHT |
BUFFER_BIT_DEPTH |
BUFFER_BIT_STENCIL |
BUFFER_BIT_ACCUM |
BUFFER_BIT_AUX0;
assert((buffers & (~legalBits)) == 0);
}
#endif
if (!_mesa_check_conditional_render(ctx))
return; /* don't clear */
swrast_render_start(ctx);
/* do software clearing here */
if (buffers) {
if ((buffers & BUFFER_BITS_COLOR)
&& (ctx->DrawBuffer->_NumColorDrawBuffers > 0)) {
clear_color_buffers(ctx);
}
if (buffers & BUFFER_BIT_DEPTH) {
_swrast_clear_depth_buffer(ctx, ctx->DrawBuffer->_DepthBuffer);
}
if (buffers & BUFFER_BIT_ACCUM) {
_swrast_clear_accum_buffer(ctx,
ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
}
if (buffers & BUFFER_BIT_STENCIL) {
_swrast_clear_stencil_buffer(ctx, ctx->DrawBuffer->_StencilBuffer);
}
}
swrast_render_finish(ctx);
}
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