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vc4: Add support for gl_PointCoord.

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Fixes piglit glsl-fs-pointcoord, point-sprite, and fbo-gl_pointcoord.
This commit is contained in:
Eric Anholt 2014-09-24 14:47:06 -07:00
parent 66b7bd60e0
commit 52476b35c1
1 changed files with 34 additions and 0 deletions
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34
src/gallium/drivers/vc4/vc4_program.c
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@ -59,7 +59,9 @@ struct vc4_fs_key {
bool is_points;
bool is_lines;
bool alpha_test;
bool point_coord_upper_left;
uint8_t alpha_test_func;
uint32_t point_sprite_mask;
struct pipe_rt_blend_state blend;
};
@ -868,6 +870,26 @@ emit_fragcoord_input(struct vc4_compile *c, int attr)
c->inputs[attr * 4 + 3] = qir_RCP(c, qir_FRAG_W(c));
}
static void
emit_point_coord_input(struct vc4_compile *c, int attr)
{
if (c->point_x.file == QFILE_NULL) {
c->point_x = qir_uniform_f(c, 0.0);
c->point_y = qir_uniform_f(c, 0.0);
}
c->inputs[attr * 4 + 0] = c->point_x;
if (c->fs_key->point_coord_upper_left) {
c->inputs[attr * 4 + 1] = qir_FSUB(c,
qir_uniform_f(c, 1.0),
c->point_y);
} else {
c->inputs[attr * 4 + 1] = c->point_y;
}
c->inputs[attr * 4 + 2] = qir_uniform_f(c, 0.0);
c->inputs[attr * 4 + 3] = qir_uniform_f(c, 1.0);
}
static struct qreg
emit_fragment_varying(struct vc4_compile *c, int index)
{
@ -915,6 +937,10 @@ emit_tgsi_declaration(struct vc4_compile *c,
if (decl->Semantic.Name ==
TGSI_SEMANTIC_POSITION) {
emit_fragcoord_input(c, i);
} else if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
(c->fs_key->point_sprite_mask &
(1 << decl->Semantic.Index))) {
emit_point_coord_input(c, i);
} else {
emit_fragment_input(c, i, decl);
}
@ -1705,6 +1731,14 @@ vc4_update_compiled_fs(struct vc4_context *vc4, uint8_t prim_mode)
key->alpha_test_func = vc4->zsa->base.alpha.func;
}
if (key->is_points) {
key->point_sprite_mask =
vc4->rasterizer->base.sprite_coord_enable;
key->point_coord_upper_left =
(vc4->rasterizer->base.sprite_coord_mode ==
PIPE_SPRITE_COORD_UPPER_LEFT);
}
vc4->prog.fs = util_hash_table_get(vc4->fs_cache, key);
if (vc4->prog.fs)
return;