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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.
*/
/**
* quad blending
*/
#include "glheader.h"
#include "imports.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
#include "pipe/p_defines.h"
static void
depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
struct softpipe_context *softpipe = qs->softpipe;
GLuint j;
struct softpipe_surface *sps = softpipe_surface(softpipe->framebuffer.zbuf);
GLfloat zzzz[QUAD_SIZE]; /**< Z for four pixels in quad */
#if 0
assert(sps); /* shouldn't get here if there's no zbuffer */
#else
if (!sps)
return;
#endif
/* XXX get zquad from zbuffer */
sps->read_quad_z(sps, quad->x0, quad->y0, zzzz);
switch (softpipe->depth_test.func) {
case PIPE_FUNC_NEVER:
quad->mask = 0x0;
break;
case PIPE_FUNC_LESS:
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
if (quad->outputs.depth[j] >= zzzz[j]) {
/* fail */
quad->mask &= (1 << j);
}
else if (softpipe->depth_test.writemask) {
/* pass, and update Z buffer */
zzzz[j] = quad->outputs.depth[j];
}
}
}
break;
case PIPE_FUNC_EQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
if (quad->outputs.depth[j] != zzzz[j]) {
/* fail */
quad->mask &= (1 << j);
}
else if (softpipe->depth_test.writemask) {
/* pass, and update Z buffer */
zzzz[j] = quad->outputs.depth[j];
}
}
}
break;
case PIPE_FUNC_LEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
if (quad->outputs.depth[j] > zzzz[j]) {
/* fail */
quad->mask &= (1 << j);
}
else if (softpipe->depth_test.writemask) {
/* pass, and update Z buffer */
zzzz[j] = quad->outputs.depth[j];
}
}
}
break;
/* XXX fill in remaining cases */
default:
abort();
}
/* XXX write updated zquad to zbuffer */
sps->write_quad_z(sps, quad->x0, quad->y0, zzzz);
qs->next->run(qs->next, quad);
}
struct quad_stage *sp_quad_depth_test_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->run = depth_test_quad;
return stage;
}
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