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/**
* quad alpha test
*/
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_quad.h"
#include "pipe/p_defines.h"
#include "util/u_memory.h"
static void
alpha_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
struct softpipe_context *softpipe = qs->softpipe;
const float ref = softpipe->depth_stencil->alpha.ref;
unsigned passMask = 0x0, j;
const uint cbuf = 0; /* only output[0].alpha is tested */
const float *aaaa = quad->output.color[cbuf][3];
switch (softpipe->depth_stencil->alpha.func) {
case PIPE_FUNC_NEVER:
break;
case PIPE_FUNC_LESS:
/*
* If mask were an array [4] we could do this SIMD-style:
* passMask = (quad->outputs.color[0][3] <= vec4(ref));
*/
for (j = 0; j < QUAD_SIZE; j++) {
if (aaaa[j] < ref) {
passMask |= (1 << j);
}
}
break;
case PIPE_FUNC_EQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (aaaa[j] == ref) {
passMask |= (1 << j);
}
}
break;
case PIPE_FUNC_LEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (aaaa[j] <= ref) {
passMask |= (1 << j);
}
}
break;
case PIPE_FUNC_GREATER:
for (j = 0; j < QUAD_SIZE; j++) {
if (aaaa[j] > ref) {
passMask |= (1 << j);
}
}
break;
case PIPE_FUNC_NOTEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (aaaa[j] != ref) {
passMask |= (1 << j);
}
}
break;
case PIPE_FUNC_GEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (aaaa[j] >= ref) {
passMask |= (1 << j);
}
}
break;
case PIPE_FUNC_ALWAYS:
passMask = MASK_ALL;
break;
default:
assert(0);
}
quad->inout.mask &= passMask;
if (quad->inout.mask)
qs->next->run(qs->next, quad);
}
static void alpha_test_begin(struct quad_stage *qs)
{
qs->next->begin(qs->next);
}
static void alpha_test_destroy(struct quad_stage *qs)
{
FREE( qs );
}
struct quad_stage *
sp_quad_alpha_test_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->begin = alpha_test_begin;
stage->run = alpha_test_quad;
stage->destroy = alpha_test_destroy;
return stage;
}
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