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vc4: Clamp the shadow comparison value.

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Fixes piglit glsl-fs-shadow2D-clamp-z.

Cc: <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Eric Anholt 2016-11-07 12:25:47 -08:00
parent e887341d3f
commit 08d51487e3
1 changed files with 9 additions and 0 deletions
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9
src/gallium/drivers/vc4/vc4_program.c
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@ -495,6 +495,15 @@ ntq_emit_tex(struct vc4_compile *c, nir_tex_instr *instr)
struct qreg u0 = qir_uniform_f(c, 0.0f);
struct qreg u1 = qir_uniform_f(c, 1.0f);
if (c->key->tex[unit].compare_mode) {
/* From the GL_ARB_shadow spec:
*
* "Let Dt (D subscript t) be the depth texture
* value, in the range [0, 1]. Let R be the
* interpolated texture coordinate clamped to the
* range [0, 1]."
*/
compare = qir_SAT(c, compare);
switch (c->key->tex[unit].compare_func) {
case PIPE_FUNC_NEVER:
depth_output = qir_uniform_f(c, 0.0f);