diff options
Diffstat (limited to 'src/glsl/link_varyings.cpp')
| -rw-r--r-- | src/glsl/link_varyings.cpp | 38 |
1 files changed, 32 insertions, 6 deletions
diff --git a/src/glsl/link_varyings.cpp b/src/glsl/link_varyings.cpp index c0b4b3e820c..560906a3eaf 100644 --- a/src/glsl/link_varyings.cpp +++ b/src/glsl/link_varyings.cpp @@ -766,7 +766,7 @@ public: gl_shader_stage consumer_stage); ~varying_matches(); void record(ir_variable *producer_var, ir_variable *consumer_var); - unsigned assign_locations(uint64_t reserved_slots); + unsigned assign_locations(uint64_t reserved_slots, bool separate_shader); void store_locations() const; private: @@ -986,11 +986,36 @@ varying_matches::record(ir_variable *producer_var, ir_variable *consumer_var) * passed to varying_matches::record(). */ unsigned -varying_matches::assign_locations(uint64_t reserved_slots) +varying_matches::assign_locations(uint64_t reserved_slots, bool separate_shader) { - /* Sort varying matches into an order that makes them easy to pack. */ - qsort(this->matches, this->num_matches, sizeof(*this->matches), - &varying_matches::match_comparator); + /* We disable varying sorting for separate shader programs for the + * following reasons: + * + * 1/ All programs must sort the code in the same order to guarantee the + * interface matching. However varying_matches::record() will change the + * interpolation qualifier of some stages. + * + * 2/ GLSL version 4.50 removes the matching constrain on the interpolation + * qualifier. + * + * From Section 4.5 (Interpolation Qualifiers) of the GLSL 4.40 spec: + * + * "The type and presence of interpolation qualifiers of variables with + * the same name declared in all linked shaders for the same cross-stage + * interface must match, otherwise the link command will fail. + * + * When comparing an output from one stage to an input of a subsequent + * stage, the input and output don't match if their interpolation + * qualifiers (or lack thereof) are not the same." + * + * "It is a link-time error if, within the same stage, the interpolation + * qualifiers of variables of the same name do not match." + */ + if (!separate_shader) { + /* Sort varying matches into an order that makes them easy to pack. */ + qsort(this->matches, this->num_matches, sizeof(*this->matches), + &varying_matches::match_comparator); + } unsigned generic_location = 0; unsigned generic_patch_location = MAX_VARYING*4; @@ -1590,7 +1615,8 @@ assign_varying_locations(struct gl_context *ctx, reserved_varying_slot(producer, ir_var_shader_out) | reserved_varying_slot(consumer, ir_var_shader_in); - const unsigned slots_used = matches.assign_locations(reserved_slots); + const unsigned slots_used = matches.assign_locations(reserved_slots, + prog->SeparateShader); matches.store_locations(); for (unsigned i = 0; i < num_tfeedback_decls; ++i) { |