This function determines how a variable should be interpolated based
both on interpolation qualifiers and the current shade model.
---
src/glsl/ir.cpp | 15 +++++++++++++++
src/glsl/ir.h | 11 +++++++++++
2 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index 9aad0fc..ef7300e 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1354,6 +1354,21 @@ ir_variable::interpolation_string() const
}
+glsl_interp_qualifier
+ir_variable::determine_interpolation_mode(bool flat_shade)
+{
+ if (this->interpolation != INTERP_QUALIFIER_NONE)
+ return (glsl_interp_qualifier) this->interpolation;
+ int location = this->location;
+ bool is_gl_Color =
+ location == FRAG_ATTRIB_COL0 || location == FRAG_ATTRIB_COL1;
+ if (flat_shade && is_gl_Color)
+ return INTERP_QUALIFIER_FLAT;
+ else
+ return INTERP_QUALIFIER_SMOOTH;
+}
+
+
ir_function_signature::ir_function_signature(const glsl_type *return_type)
: return_type(return_type), is_defined(false), _function(NULL)
{
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 0c0cccb..404d4cf 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -292,6 +292,17 @@ public:
const char *interpolation_string() const;
/**
+ * Determine how this variable should be interpolated based on its
+ * interpolation qualifier (if present), whether it is gl_Color or
+ * gl_SecondaryColor, and whether flatshading is enabled in the current GL
+ * state.
+ *
+ * The return value will always be either INTERP_QUALIFIER_SMOOTH,
+ * INTERP_QUALIFIER_NOPERSPECTIVE, or INTERP_QUALIFIER_FLAT.
+ */
+ glsl_interp_qualifier determine_interpolation_mode(bool flat_shade);
+
+ /**
* Delcared name of the variable
*/
const char *name;
--
1.7.6.4
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