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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.
*/
/* Vertices are just an array of floats, with all the attributes
* packed. We currently assume a layout like:
*
* attr[0][0..3] - window position
* attr[1..n][0..3] - remaining attributes.
*
* Attributes are assumed to be 4 floats wide but are packed so that
* all the enabled attributes run contiguously.
*/
#include "glheader.h"
#include "imports.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
static void mask_copy( GLfloat (*dest)[4],
GLfloat (*src)[4],
GLuint mask )
{
GLuint i, j;
for (i = 0; i < 4; i++) {
if (mask & (1<<i)) {
for (j = 0; j < 4; j++) {
dest[j][i] = src[j][i];
}
}
}
}
/**
* Write quad to framebuffer, taking mask into account.
*
* Note that surfaces support only full quad reads and writes.
*/
static void
output_quad(struct quad_stage *qs, struct quad_header *quad)
{
struct softpipe_context *softpipe = qs->softpipe;
struct softpipe_surface *sps = softpipe_surface(softpipe->cbuf);
if (quad->mask != MASK_ALL) {
GLfloat tmp[4][QUAD_SIZE];
/* XXX probably add a masked-write function someday */
sps->read_quad_f_swz(sps, quad->x0, quad->y0, tmp);
mask_copy( tmp, quad->outputs.color, quad->mask );
sps->write_quad_f_swz(sps, quad->x0, quad->y0, tmp);
}
else if (quad->mask) {
sps->write_quad_f_swz(sps, quad->x0, quad->y0, quad->outputs.color);
}
}
static void output_begin(struct quad_stage *qs)
{
if (qs->next)
qs->next->begin(qs->next);
}
struct quad_stage *sp_quad_output_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->begin = output_begin;
stage->run = output_quad;
return stage;
}
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