diff options
| -rw-r--r-- | src/glsl/ast_to_hir.cpp | 92 |
1 files changed, 71 insertions, 21 deletions
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp index a14fe7d3f5b..f934c8e2d30 100644 --- a/src/glsl/ast_to_hir.cpp +++ b/src/glsl/ast_to_hir.cpp @@ -1910,6 +1910,29 @@ ast_type_specifier::glsl_type(const char **name, } +/** + * Determine whether a toplevel variable declaration declares a varying. This + * function operates by examining the variable's mode and the shader target, + * so it correctly identifies linkage variables regardless of whether they are + * declared using the deprecated "varying" syntax or the new "in/out" syntax. + * + * Passing a non-toplevel variable declaration (e.g. a function parameter) to + * this function will produce undefined results. + */ +static bool +is_varying_var(ir_variable *var, _mesa_glsl_parser_targets target) +{ + switch (target) { + case vertex_shader: + return var->mode == ir_var_out; + case fragment_shader: + return var->mode == ir_var_in; + default: + return var->mode == ir_var_out || var->mode == ir_var_in; + } +} + + static void apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, ir_variable *var, @@ -1945,27 +1968,6 @@ apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, _mesa_glsl_shader_target_name(state->target)); } - /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec: - * - * "The varying qualifier can be used only with the data types - * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of - * these." - */ - if (qual->flags.q.varying) { - const glsl_type *non_array_type; - - if (var->type && var->type->is_array()) - non_array_type = var->type->fields.array; - else - non_array_type = var->type; - - if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) { - var->type = glsl_type::error_type; - _mesa_glsl_error(loc, state, - "varying variables must be of base type float"); - } - } - /* If there is no qualifier that changes the mode of the variable, leave * the setting alone. */ @@ -1980,6 +1982,54 @@ apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual, else if (qual->flags.q.uniform) var->mode = ir_var_uniform; + if (!is_parameter && is_varying_var(var, state->target)) { + /* This variable is being used to link data between shader stages (in + * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type + * that is allowed for such purposes. + * + * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec: + * + * "The varying qualifier can be used only with the data types + * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of + * these." + * + * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From + * page 31 (page 37 of the PDF) of the GLSL 1.30 spec: + * + * "Fragment inputs can only be signed and unsigned integers and + * integer vectors, float, floating-point vectors, matrices, or + * arrays of these. Structures cannot be input. + * + * Similar text exists in the section on vertex shader outputs. + * + * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES + * 3.00 spec claims to allow structs as well. However, this is likely + * an error, since section 11 of the spec ("Counting of Inputs and + * Outputs") enumerates all possible types of interstage linkage + * variables, and it does not mention structs. + */ + switch (var->type->get_scalar_type()->base_type) { + case GLSL_TYPE_FLOAT: + /* Ok in all GLSL versions */ + break; + case GLSL_TYPE_UINT: + case GLSL_TYPE_INT: + if (state->is_version(130, 300)) + break; + _mesa_glsl_error(loc, state, + "varying variables must be of base type float in %s", + state->get_version_string()); + break; + case GLSL_TYPE_STRUCT: + _mesa_glsl_error(loc, state, + "varying variables may not be of type struct"); + break; + default: + _mesa_glsl_error(loc, state, "illegal type for a varying variable"); + break; + } + } + if (state->all_invariant && (state->current_function == NULL)) { switch (state->target) { case vertex_shader: |