diff options
| -rw-r--r-- | src/glsl/ir.h | 6 | ||||
| -rw-r--r-- | src/glsl/ir_constant_expression.cpp | 27 |
2 files changed, 25 insertions, 8 deletions
diff --git a/src/glsl/ir.h b/src/glsl/ir.h index 811eac08878..bb4f7759b30 100644 --- a/src/glsl/ir.h +++ b/src/glsl/ir.h @@ -478,6 +478,12 @@ public: virtual ir_visitor_status accept(ir_hierarchical_visitor *); /** + * Attempt to evaluate this function as a constant expression, given + * a list of the actual parameters. Returns NULL for non-built-ins. + */ + ir_constant *constant_expression_value(exec_list *actual_parameters); + + /** * Get the name of the function for which this is a signature */ const char *function_name() const; diff --git a/src/glsl/ir_constant_expression.cpp b/src/glsl/ir_constant_expression.cpp index 2910b2e162b..aa47c08d88a 100644 --- a/src/glsl/ir_constant_expression.cpp +++ b/src/glsl/ir_constant_expression.cpp @@ -1027,18 +1027,29 @@ ir_call::constant_expression_value() if (this->type == glsl_type::error_type) return NULL; + return this->callee->constant_expression_value(&this->actual_parameters); +} + + +ir_constant * +ir_function_signature::constant_expression_value(exec_list *actual_parameters) +{ + const glsl_type *type = this->return_type; + if (type == glsl_type::void_type) + return NULL; + /* From the GLSL 1.20 spec, page 23: * "Function calls to user-defined functions (non-built-in functions) * cannot be used to form constant expressions." */ - if (!this->callee->is_builtin) + if (!this->is_builtin) return NULL; unsigned num_parameters = 0; /* Check if all parameters are constant */ ir_constant *op[3]; - foreach_list(n, &this->actual_parameters) { + foreach_list(n, actual_parameters) { ir_constant *constant = ((ir_rvalue *) n)->constant_expression_value(); if (constant == NULL) return NULL; @@ -1060,7 +1071,7 @@ ir_call::constant_expression_value() ir_constant_data data; memset(&data, 0, sizeof(data)); - const char *callee = this->callee_name(); + const char *callee = this->function_name(); if (strcmp(callee, "abs") == 0) { expr = new(mem_ctx) ir_expression(ir_unop_abs, type, op[0], NULL); } else if (strcmp(callee, "all") == 0) { @@ -1108,7 +1119,7 @@ ir_call::constant_expression_value() for (unsigned c = 0; c < op[0]->type->components(); c++) data.f[c] = atanhf(op[0]->value.f[c]); } else if (strcmp(callee, "dFdx") == 0 || strcmp(callee, "dFdy") == 0) { - return ir_constant::zero(mem_ctx, this->type); + return ir_constant::zero(mem_ctx, type); } else if (strcmp(callee, "ceil") == 0) { expr = new(mem_ctx) ir_expression(ir_unop_ceil, type, op[0], NULL); } else if (strcmp(callee, "clamp") == 0) { @@ -1199,7 +1210,7 @@ ir_call::constant_expression_value() } else if (strcmp(callee, "fract") == 0) { expr = new(mem_ctx) ir_expression(ir_unop_fract, type, op[0], NULL); } else if (strcmp(callee, "fwidth") == 0) { - return ir_constant::zero(mem_ctx, this->type); + return ir_constant::zero(mem_ctx, type); } else if (strcmp(callee, "greaterThan") == 0) { assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector()); for (unsigned c = 0; c < op[0]->type->components(); c++) { @@ -1305,7 +1316,7 @@ ir_call::constant_expression_value() float length = sqrtf(dot(op[0], op[0])); if (length == 0) - return ir_constant::zero(mem_ctx, this->type); + return ir_constant::zero(mem_ctx, type); for (unsigned c = 0; c < op[0]->type->components(); c++) data.f[c] = op[0]->value.f[c] / length; @@ -1356,7 +1367,7 @@ ir_call::constant_expression_value() const float dot_NI = dot(op[1], op[0]); const float k = 1.0F - eta * eta * (1.0F - dot_NI * dot_NI); if (k < 0.0) { - return ir_constant::zero(mem_ctx, this->type); + return ir_constant::zero(mem_ctx, type); } else { for (unsigned c = 0; c < type->components(); c++) { data.f[c] = eta * op[0]->value.f[c] - (eta * dot_NI + sqrtf(k)) @@ -1425,5 +1436,5 @@ ir_call::constant_expression_value() if (expr != NULL) return expr->constant_expression_value(); - return new(mem_ctx) ir_constant(this->type, &data); + return new(mem_ctx) ir_constant(type, &data); } |