diff options
| author | Chad Versace <[email protected]> | 2011-07-27 13:00:02 -0700 |
|---|---|---|
| committer | Chad Versace <[email protected]> | 2011-07-30 07:27:30 -0700 |
| commit | a5ab9398e34287ed8cbb010d0758790e6692530c (patch) | |
| tree | 051a045d1b0178149296816242f52a8d38e919d8 /src/glsl | |
| parent | 6efe1a849586e46028c1eb763175904166ec7076 (diff) | |
glsl: Fix conversions in array constructors
Array constructors obey narrower conversion rules than other constructors
[1] --- they use the implicit conversion rules [2] instead of the scalar
constructor conversions [3]. But process_array_constructor() was
incorrectly applying the broader rules.
[1] GLSL 1.50 spec, Section 5.4.4 Array Constructors, page 52 (58 of pdf)
[2] GLSL 1.50 spec, Section 4.1.10 Implicit Conversions, page 25 (31 of pdf)
[3] GLSL 1.50 spec, Section 5.4.1 Conversion, page 48 (54 of pdf)
To fix this, first check (with glsl_type::can_be_implicitly_converted_to)
if an implicit conversion is legal before performing the conversion.
Fixes:
piglit:spec/glsl-1.20/compiler/structure-and-array-operations/array-ctor-implicit-conversion-bool-float.vert
piglit:spec/glsl-1.20/compiler/structure-and-array-operations/array-ctor-implicit-conversion-bvec*-vec*.vert
Note: This is a candidate for the 7.10 and 7.11 branches.
Reviewed-by: Kenneth Graunke <[email protected]>
Signed-off-by: Chad Versace <[email protected]>
Diffstat (limited to 'src/glsl')
| -rw-r--r-- | src/glsl/ast_function.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/glsl/ast_function.cpp b/src/glsl/ast_function.cpp index bdb73f48706..8bcf48dfd91 100644 --- a/src/glsl/ast_function.cpp +++ b/src/glsl/ast_function.cpp @@ -442,13 +442,21 @@ process_array_constructor(exec_list *instructions, ir_rvalue *ir = (ir_rvalue *) n; ir_rvalue *result = ir; - /* Apply implicit conversions (not the scalar constructor rules!) */ + /* Apply implicit conversions (not the scalar constructor rules!). See + * the spec quote above. */ if (constructor_type->element_type()->is_float()) { const glsl_type *desired_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, ir->type->vector_elements, ir->type->matrix_columns); - result = convert_component(ir, desired_type); + if (result->type->can_implicitly_convert_to(desired_type)) { + /* Even though convert_component() implements the constructor + * conversion rules (not the implicit conversion rules), its safe + * to use it here because we already checked that the implicit + * conversion is legal. + */ + result = convert_component(ir, desired_type); + } } if (result->type != constructor_type->element_type()) { |