From: Samuel Iglesias Gonsalvez <sigles...@igalia.com>
Commit 7e414b58640aee6e243d337e72cea290c354f632 broke the gl_FragData array
into separate gl_FragData[i] variables, so drivers can eliminate useless
writes to gl_FragData improving their performance.
The problem occurs when GLSL IR code is linked in the following case:
* The FS output variable base data type does not match gl_FragData one (float
vector)
* The FS output variable is replaced by gl_out_FragDataX because of commit
7e414b58640aee6 with X from 0 to GL_MAX_DRAW_BUFFERS.
Then the FS output variable base data type is lost in the resulting GLSL IR,
making that the driver does a wrong assignment to gl_out_FragData components
because of unmatching data types.
This patch reverts the fragdata array lowering when the output var base data
type
doesn't match gl_out_FragData, i.e., when output variable base data type is
not a float or a float vector.
This patch fixes 250 dEQP tests (tested in an Intel Haswell machine)
dEQP-GLES3.functional.fragment_out.random.* (22 failed tests)
dEQP-GLES3.functional.fragment_out.array.uint.* (120 failed tests)
dEQP-GLES3.functional.fragment_out.array.int.* (108 failed tests)
Signed-off-by: Samuel Iglesias Gonsalvez <sigles...@igalia.com>
---
src/glsl/opt_dead_builtin_varyings.cpp | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/glsl/opt_dead_builtin_varyings.cpp
b/src/glsl/opt_dead_builtin_varyings.cpp
index 50c8aa7..4919c8b 100644
--- a/src/glsl/opt_dead_builtin_varyings.cpp
+++ b/src/glsl/opt_dead_builtin_varyings.cpp
@@ -99,6 +99,16 @@ public:
}
else {
this->fragdata_usage |= 1 << index->get_uint_component(0);
+ /* Don't lowered fragdata array if the output variable
+ * is not a float variable (or float vector) because it will
+ * generate wrong register assignments because of different
+ * data types.
+ */
+ if (var->type->gl_type != GL_FLOAT &&
+ var->type->gl_type != GL_FLOAT_VEC2 &&
+ var->type->gl_type != GL_FLOAT_VEC3 &&
+ var->type->gl_type != GL_FLOAT_VEC4)
+ this->lower_fragdata_array = false;
}
/* Don't visit the leaves of ir_dereference_array. */
--
2.1.3
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