From 08d51487e3b8cfb14ca2ece9545b2e2ed344e3cc Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Mon, 7 Nov 2016 12:25:47 -0800 Subject: [PATCH] vc4: Clamp the shadow comparison value. Fixes piglit glsl-fs-shadow2D-clamp-z. Cc: --- src/gallium/drivers/vc4/vc4_program.c | 9 +++++++++ 1 file changed, 9 insertions(+) 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); -- 2.30.2