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authorEric Anholt <[email protected]>2016-11-07 12:25:47 -0800
committerEric Anholt <[email protected]>2016-11-09 15:33:56 -0800
commit08d51487e3b8cfb14ca2ece9545b2e2ed344e3cc (patch)
tree786f904b7004e5ff9da1e6ab2633389f4964adae /src
parente887341d3f4a3b13b2bf56b4a931afb78ca0526e (diff)
vc4: Clamp the shadow comparison value.
Fixes piglit glsl-fs-shadow2D-clamp-z. Cc: <[email protected]>
Diffstat (limited to 'src')
-rw-r--r--src/gallium/drivers/vc4/vc4_program.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/gallium/drivers/vc4/vc4_program.c b/src/gallium/drivers/vc4/vc4_program.c
index 86f71f68d82..abd20a5940b 100644
--- a/src/gallium/drivers/vc4/vc4_program.c
+++ b/src/gallium/drivers/vc4/vc4_program.c
@@ -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);