From baf7f99fd7a092a1390b7a145e09caa5325a8116 Mon Sep 17 00:00:00 2001 From: Paul Berry Date: Fri, 21 Oct 2011 07:55:48 -0700 Subject: glsl: add ir_variable::determine_interpolation_mode() function. This function determines how a variable should be interpolated based both on interpolation qualifiers and the current shade model. Reviewed-by: Kenneth Graunke Reviewed-by: Eric Anholt --- src/glsl/ir.cpp | 15 +++++++++++++++ src/glsl/ir.h | 11 +++++++++++ 2 files changed, 26 insertions(+) (limited to 'src') diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp index 9aad0fcd42f..ef7300e6535 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 0c0cccbd034..404d4cffa91 100644 --- a/src/glsl/ir.h +++ b/src/glsl/ir.h @@ -291,6 +291,17 @@ 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 */ -- cgit v1.2.3