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/*
* Mesa 3-D graphics library
* Version: 6.1
*
* Copyright (C) 1999-2004 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 "imports.h"
#include "s_auxbuffer.h"
#include "s_context.h"
/**
* Allocate memory for the software auxillary buffers associated with
* the given GLframebuffer. Free any currently allocated aux buffers
* first.
*/
void
_swrast_alloc_aux_buffers( GLframebuffer *buffer )
{
GLint i;
for (i = 0; i < buffer->Visual.numAuxBuffers; i++) {
if (buffer->AuxBuffers[i]) {
_mesa_free(buffer->AuxBuffers[i]);
buffer->AuxBuffers[i] = NULL;
}
buffer->AuxBuffers[i] = (GLchan *) _mesa_malloc(buffer->Width
* buffer->Height * 4 * sizeof(GLchan));
}
}
/* RGBA */
#define NAME(PREFIX) PREFIX##_aux
#define SPAN_VARS \
const SWcontext *swrast = SWRAST_CONTEXT(ctx);
#define INIT_PIXEL_PTR(P, X, Y) \
GLchan *P = swrast->CurAuxBuffer + ((Y) * ctx->DrawBuffer->Width + (X)) * 4; \
assert(swrast->CurAuxBuffer);
#define INC_PIXEL_PTR(P) P += 4
#if CHAN_TYPE == GL_FLOAT
#define STORE_RGB_PIXEL(P, X, Y, R, G, B) \
P[0] = MAX2((R), 0.0F); \
P[1] = MAX2((G), 0.0F); \
P[2] = MAX2((B), 0.0F); \
P[3] = CHAN_MAXF
#define STORE_RGBA_PIXEL(P, X, Y, R, G, B, A) \
P[0] = MAX2((R), 0.0F); \
P[1] = MAX2((G), 0.0F); \
P[2] = MAX2((B), 0.0F); \
P[3] = CLAMP((A), 0.0F, CHAN_MAXF)
#else
#define STORE_RGB_PIXEL(P, X, Y, R, G, B) \
P[0] = R; P[1] = G; P[2] = B; P[3] = CHAN_MAX
#define STORE_RGBA_PIXEL(P, X, Y, R, G, B, A) \
P[0] = R; P[1] = G; P[2] = B; P[3] = A
#endif
#define FETCH_RGBA_PIXEL(R, G, B, A, P) \
R = P[0]; G = P[1]; B = P[2]; A = P[3]
#include "swrast/s_spantemp.h"
/**
* Called from driver's SetBuffer() function to choose an aux buffer.
*/
void
_swrast_use_aux_buffer(GLcontext *ctx, GLframebuffer *buffer, GLuint bufferBit)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
(void) buffer;
switch (bufferBit) {
case DD_AUX0_BIT:
ASSERT(buffer->Visual.numAuxBuffers >= 1);
swrast->CurAuxBuffer = ctx->DrawBuffer->AuxBuffers[0];
break;
case DD_AUX1_BIT:
ASSERT(buffer->Visual.numAuxBuffers >= 2);
swrast->CurAuxBuffer = ctx->DrawBuffer->AuxBuffers[1];
break;
case DD_AUX2_BIT:
ASSERT(buffer->Visual.numAuxBuffers >= 3);
swrast->CurAuxBuffer = ctx->DrawBuffer->AuxBuffers[2];
break;
case DD_AUX3_BIT:
ASSERT(buffer->Visual.numAuxBuffers >= 4);
swrast->CurAuxBuffer = ctx->DrawBuffer->AuxBuffers[3];
break;
default:
swrast->CurAuxBuffer = NULL;
}
swrast->Driver.WriteRGBASpan = write_rgba_span_aux;
swrast->Driver.WriteRGBSpan = write_rgb_span_aux;
swrast->Driver.WriteMonoRGBASpan = write_monorgba_span_aux;
swrast->Driver.WriteRGBAPixels = write_rgba_pixels_aux;
swrast->Driver.WriteMonoRGBAPixels = write_monorgba_pixels_aux;
swrast->Driver.ReadRGBASpan = read_rgba_span_aux;
swrast->Driver.ReadRGBAPixels = read_rgba_pixels_aux;
}
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