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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 "pipe/p_defines.h"
#include "pipe/p_util.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
#include "sp_tile_cache.h"
/**
* Do depth testing for a quad.
* Not static since it's used by the stencil code.
*/
/*
* 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...
*/
void
sp_depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
struct softpipe_context *softpipe = qs->softpipe;
struct pipe_surface *ps = softpipe->framebuffer.zbuf;
const enum pipe_format format = ps->format;
unsigned bzzzz[QUAD_SIZE]; /**< Z values fetched from depth buffer */
unsigned qzzzz[QUAD_SIZE]; /**< Z values from the quad */
unsigned zmask = 0;
unsigned j;
struct softpipe_cached_tile *tile
= sp_get_cached_tile(softpipe, softpipe->zbuf_cache, quad->x0, quad->y0);
assert(ps); /* shouldn't get here if there's no zbuffer */
/*
* Convert quad's float depth values to int depth values (qzzzz).
* 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.
*
* Also, get the zbuffer values (bzzzz) from the cached tile.
*/
switch (format) {
case PIPE_FORMAT_Z16_UNORM:
{
float scale = 65535.0;
for (j = 0; j < QUAD_SIZE; j++) {
qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
}
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
bzzzz[j] = tile->data.depth16[y][x];
}
}
break;
case PIPE_FORMAT_Z32_UNORM:
{
double scale = (double) (uint) ~0UL;
for (j = 0; j < QUAD_SIZE; j++) {
qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
}
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
bzzzz[j] = tile->data.depth32[y][x];
}
}
break;
case PIPE_FORMAT_S8Z24_UNORM:
{
float scale = (float) ((1 << 24) - 1);
for (j = 0; j < QUAD_SIZE; j++) {
qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
}
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
bzzzz[j] = tile->data.depth32[y][x] & 0xffffff;
}
}
break;
case PIPE_FORMAT_Z24S8_UNORM:
{
float scale = (float) ((1 << 24) - 1);
for (j = 0; j < QUAD_SIZE; j++) {
qzzzz[j] = (unsigned) (quad->outputs.depth[j] * scale);
}
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
bzzzz[j] = tile->data.depth32[y][x] >> 8;
}
}
break;
default:
assert(0);
}
switch (softpipe->depth_stencil->depth.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_stencil->depth.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];
}
}
/* put updated Z values back into cached tile */
switch (format) {
case PIPE_FORMAT_Z16_UNORM:
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
tile->data.depth16[y][x] = (ushort) bzzzz[j];
}
break;
case PIPE_FORMAT_Z32_UNORM:
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
tile->data.depth32[y][x] = bzzzz[j];
}
break;
case PIPE_FORMAT_S8Z24_UNORM:
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
uint s8z24 = tile->data.depth32[y][x];
s8z24 = (s8z24 & 0xff000000) | bzzzz[j];
tile->data.depth32[y][x] = s8z24;
}
break;
case PIPE_FORMAT_Z24S8_UNORM:
for (j = 0; j < QUAD_SIZE; j++) {
int x = quad->x0 % TILE_SIZE + (j & 1);
int y = quad->y0 % TILE_SIZE + (j >> 1);
uint z24s8 = tile->data.depth32[y][x];
z24s8 = (z24s8 & 0xff) | (bzzzz[j] << 24);
tile->data.depth32[y][x] = z24s8;
}
break;
default:
assert(0);
}
}
}
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);
}
static void depth_test_begin(struct quad_stage *qs)
{
qs->next->begin(qs->next);
}
static void depth_test_destroy(struct quad_stage *qs)
{
FREE( qs );
}
struct quad_stage *sp_quad_depth_test_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->begin = depth_test_begin;
stage->run = depth_test_quad;
stage->destroy = depth_test_destroy;
return stage;
}
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