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/**
* quad alpha test
*/
#include "lp_context.h"
#include "lp_quad.h"
#include "lp_quad_pipe.h"
#include "pipe/p_defines.h"
#include "util/u_memory.h"
#define ALPHATEST( FUNC, COMP ) \
static void \
alpha_test_quads_##FUNC( struct quad_stage *qs, \
struct quad_header *quads[], \
unsigned nr ) \
{ \
const float ref = qs->llvmpipe->depth_stencil->alpha.ref_value; \
const uint cbuf = 0; /* only output[0].alpha is tested */ \
unsigned pass_nr = 0; \
unsigned i; \
\
for (i = 0; i < nr; i++) { \
const float *aaaa = quads[i]->output.color[cbuf][3]; \
unsigned passMask = 0; \
\
if (aaaa[0] COMP ref) passMask |= (1 << 0); \
if (aaaa[1] COMP ref) passMask |= (1 << 1); \
if (aaaa[2] COMP ref) passMask |= (1 << 2); \
if (aaaa[3] COMP ref) passMask |= (1 << 3); \
\
quads[i]->inout.mask &= passMask; \
\
if (quads[i]->inout.mask) \
quads[pass_nr++] = quads[i]; \
} \
\
if (pass_nr) \
qs->next->run(qs->next, quads, pass_nr); \
}
ALPHATEST( LESS, < )
ALPHATEST( EQUAL, == )
ALPHATEST( LEQUAL, <= )
ALPHATEST( GREATER, > )
ALPHATEST( NOTEQUAL, != )
ALPHATEST( GEQUAL, >= )
/* XXX: Incorporate into shader using KILP.
*/
static void
alpha_test_quad(struct quad_stage *qs,
struct quad_header *quads[],
unsigned nr)
{
switch (qs->llvmpipe->depth_stencil->alpha.func) {
case PIPE_FUNC_LESS:
alpha_test_quads_LESS( qs, quads, nr );
break;
case PIPE_FUNC_EQUAL:
alpha_test_quads_EQUAL( qs, quads, nr );
break;
case PIPE_FUNC_LEQUAL:
alpha_test_quads_LEQUAL( qs, quads, nr );
break;
case PIPE_FUNC_GREATER:
alpha_test_quads_GREATER( qs, quads, nr );
break;
case PIPE_FUNC_NOTEQUAL:
alpha_test_quads_NOTEQUAL( qs, quads, nr );
break;
case PIPE_FUNC_GEQUAL:
alpha_test_quads_GEQUAL( qs, quads, nr );
break;
case PIPE_FUNC_ALWAYS:
assert(0); /* should be caught earlier */
qs->next->run(qs->next, quads, nr);
break;
case PIPE_FUNC_NEVER:
default:
assert(0); /* should be caught earlier */
return;
}
}
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 *
lp_quad_alpha_test_stage( struct llvmpipe_context *llvmpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->llvmpipe = llvmpipe;
stage->begin = alpha_test_begin;
stage->run = alpha_test_quad;
stage->destroy = alpha_test_destroy;
return stage;
}
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