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/**
* \brief Quad stencil testing
*/
#include "main/glheader.h"
#include "main/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
stencil_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
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);
}
if (quad->mask)
qs->next->run(qs->next, quad);
}
struct quad_stage *sp_quad_stencil_test_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->run = stencil_test_quad;
return stage;
}
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