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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.
*/
/**
* \brief Quad depth testing
*/
#include "main/glheader.h"
#include "main/imports.h"
#include "pipe/p_defines.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
/**
* Do depth testing for a quad.
* Not static since it's used by the stencil code.
*/
void
sp_depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
struct softpipe_context *softpipe = qs->softpipe;
struct softpipe_surface *sps = softpipe_surface(softpipe->framebuffer.zbuf);
GLuint bzzzz[QUAD_SIZE]; /**< Z values fetched from depth buffer */
GLuint qzzzz[QUAD_SIZE]; /**< Z values from the quad */
GLuint zmask = 0;
GLuint j;
GLfloat scale;
assert(sps); /* shouldn't get here if there's no zbuffer */
/*
* To increase efficiency, we should probably have multiple versions
* of this function that are specifically for Z16, Z32 and FP Z buffers.
* Try to effectively do that with codegen...
*/
if (sps->surface.format == PIPE_FORMAT_U_Z16)
scale = 65535.0;
else if (sps->surface.format == PIPE_FORMAT_Z24_S8)
scale = (float) ((1 << 24) - 1);
else
assert(0); /* XXX fix this someday */
/*
* Convert quad's float depth values to int depth values.
* If the Z buffer stores integer values, we _have_ to do the depth
* compares with integers (not floats). Otherwise, the float->int->float
* conversion of Z values (which isn't an identity function) will cause
* Z-fighting errors.
*/
for (j = 0; j < QUAD_SIZE; j++) {
qzzzz[j] = (GLuint) (quad->outputs.depth[j] * scale);
}
/* get zquad from zbuffer */
sps->read_quad_z(sps, quad->x0, quad->y0, bzzzz);
switch (softpipe->depth_test.func) {
case PIPE_FUNC_NEVER:
/* zmask = 0 */
break;
case PIPE_FUNC_LESS:
/* Note this is pretty much a single sse or cell instruction.
* Like this: quad->mask &= (quad->outputs.depth < zzzz);
*/
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] < bzzzz[j])
zmask |= 1 << j;
}
break;
case PIPE_FUNC_EQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] == bzzzz[j])
zmask |= 1 << j;
}
break;
case PIPE_FUNC_LEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] <= bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_GREATER:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] > bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_NOTEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] != bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_GEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] >= bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_ALWAYS:
zmask = MASK_ALL;
break;
default:
abort();
}
quad->mask &= zmask;
if (softpipe->depth_test.writemask) {
/* This is also efficient with sse / spe instructions:
*/
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
bzzzz[j] = qzzzz[j];
}
}
/* write updated zquad to zbuffer */
sps->write_quad_z(sps, quad->x0, quad->y0, bzzzz);
}
}
static void
depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
sp_depth_test_quad(qs, quad);
if (quad->mask)
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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