From: Ian Romanick Date: Thu, 25 Mar 2010 23:58:45 +0000 (-0700) Subject: Add functions to generate constructors for built-in types. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=720c88eab902923123b0625f133e9ef5912f0e3f;p=mesa.git Add functions to generate constructors for built-in types. Currently only vector and matrix types are supported. Structure types will be added later. --- diff --git a/glsl_types.cpp b/glsl_types.cpp index b2631efef9b..f7ef4a302b9 100644 --- a/glsl_types.cpp +++ b/glsl_types.cpp @@ -111,6 +111,376 @@ const glsl_type *glsl_type::get_base_type() const } +/** + * Generate the function intro for a constructor + * + * \param type Data type to be constructed + * \param count Number of parameters to this concrete constructor. Most + * types have at least two constructors. One will take a + * single scalar parameter and the other will take "N" + * scalar parameters. + * \param parameters Storage for the list of parameters. These are + * typically stored in an \c ir_function_signature. + * \param instructions Storage for the preamble and body of the function. + * \param declarations Pointers to the variable declarations for the function + * parameters. These are used later to avoid having to use + * the symbol table. + */ +static void +generate_constructor_intro(const glsl_type *type, unsigned parameter_count, + exec_list *parameters, exec_list *instructions, + ir_variable **declarations) +{ + /* Names of parameters used in vector and matrix constructors + */ + static const char *const names[] = { + "a", "b", "c", "d", "e", "f", "g", "h", + "i", "j", "k", "l", "m", "n", "o", "p", + }; + + assert(parameter_count <= Elements(names)); + + const glsl_type *const parameter_type = type->get_base_type(); + + ir_label *const label = new ir_label(type->name); + instructions->push_tail(label); + + for (unsigned i = 0; i < parameter_count; i++) { + ir_variable *var = new ir_variable(parameter_type, names[i]); + + var->mode = ir_var_in; + parameters->push_tail(var); + + var = new ir_variable(parameter_type, names[i]); + + var->mode = ir_var_in; + instructions->push_tail(var); + + declarations[i] = var; + } + + ir_variable *retval = new ir_variable(type, "__retval"); + instructions->push_tail(retval); + + declarations[16] = retval; +} + + +/** + * Generate the body of a vector constructor that takes a single scalar + */ +static void +generate_vec_body_from_scalar(exec_list *instructions, + ir_variable **declarations) +{ + ir_instruction *inst; + + /* Generate a single assignment of the parameter to __retval.x and return + * __retval.xxxx for however many vector components there are. + */ + ir_dereference *const lhs = new ir_dereference(declarations[16]); + ir_dereference *const rhs = new ir_dereference(declarations[0]); + + lhs->set_swizzle(0, 0, 0, 0, 1); + + inst = new ir_assignment(lhs, rhs, NULL); + instructions->push_tail(inst); + + ir_dereference *const retval = new ir_dereference(declarations[16]); + + retval->set_swizzle(0, 0, 0, 0, declarations[16]->type->vector_elements); + + inst = new ir_return((ir_expression *) retval); + instructions->push_tail(inst); +} + + +/** + * Generate the body of a vector constructor that takes multiple scalars + */ +static void +generate_vec_body_from_N_scalars(exec_list *instructions, + ir_variable **declarations) +{ + ir_instruction *inst; + const glsl_type *const vec_type = declarations[16]->type; + + + /* Generate an assignment of each parameter to a single component of + * __retval.x and return __retval. + */ + for (unsigned i = 0; i < vec_type->vector_elements; i++) { + ir_dereference *const lhs = new ir_dereference(declarations[16]); + ir_dereference *const rhs = new ir_dereference(declarations[i]); + + lhs->selector.swizzle.x = i; + lhs->selector.swizzle.num_components = 1; + + inst = new ir_assignment(lhs, rhs, NULL); + instructions->push_tail(inst); + } + + ir_dereference *retval = new ir_dereference(declarations[16]); + + inst = new ir_return((ir_expression *) retval); + instructions->push_tail(inst); +} + + +/** + * Generate the body of a matrix constructor that takes a single scalar + */ +static void +generate_mat_body_from_scalar(exec_list *instructions, + ir_variable **declarations) +{ + ir_instruction *inst; + + /* Generate an assignment of the parameter to the X component of a + * temporary vector. Set the remaining fields of the vector to 0. The + * size of the vector is equal to the number of rows of the matrix. + * + * Set each column of the matrix to a successive "rotation" of the + * temporary vector. This fills the matrix with 0s, but writes the single + * scalar along the matrix's diagonal. + * + * For a mat4x3, this is equivalent to: + * + * vec3 tmp; + * mat4x3 __retval; + * tmp.x = a; + * tmp.y = 0.0; + * tmp.z = 0.0; + * __retval[0] = tmp.xyy; + * __retval[1] = tmp.yxy; + * __retval[2] = tmp.yyx; + * __retval[3] = tmp.yyy; + */ + const glsl_type *const column_type = declarations[16]->type->column_type(); + const glsl_type *const row_type = declarations[16]->type->row_type(); + ir_variable *const column = new ir_variable(column_type, "v"); + + instructions->push_tail(column); + + ir_dereference *const lhs = new ir_dereference(column); + ir_dereference *const rhs = new ir_dereference(declarations[0]); + + lhs->set_swizzle(0, 0, 0, 0, 1); + + inst = new ir_assignment(lhs, rhs, NULL); + instructions->push_tail(inst); + + const float z = 0.0f; + ir_constant *const zero = new ir_constant(glsl_float_type, &z); + + for (unsigned i = 1; i < column_type->vector_elements; i++) { + ir_dereference *const lhs = new ir_dereference(column); + + lhs->set_swizzle(i, 0, 0, 0, 1); + + inst = new ir_assignment(lhs, zero, NULL); + instructions->push_tail(inst); + } + + + for (unsigned i = 0; i < row_type->vector_elements; i++) { + static const unsigned swiz[] = { 1, 1, 1, 0, 1, 1, 1 }; + ir_dereference *const rhs = new ir_dereference(column); + + /* This will be .xyyy when i=0, .yxyy when i=1, etc. + */ + rhs->set_swizzle(swiz[3 - i], swiz[4 - i], swiz[5 - i], swiz[6 - i], + column_type->vector_elements); + + ir_constant *const idx = new ir_constant(glsl_int_type, &i); + ir_dereference *const lhs = new ir_dereference(declarations[16], idx); + + inst = new ir_assignment(lhs, rhs, NULL); + instructions->push_tail(inst); + } + + ir_dereference *const retval = new ir_dereference(declarations[16]); + inst = new ir_return((ir_expression *) retval); + instructions->push_tail(inst); +} + + +/** + * Generate the body of a vector constructor that takes multiple scalars + */ +static void +generate_mat_body_from_N_scalars(exec_list *instructions, + ir_variable **declarations) +{ + ir_instruction *inst; + const glsl_type *const row_type = declarations[16]->type->row_type(); + const glsl_type *const column_type = declarations[16]->type->column_type(); + + + /* Generate an assignment of each parameter to a single component of + * of a particular column of __retval and return __retval. + */ + for (unsigned i = 0; i < column_type->vector_elements; i++) { + for (unsigned j = 0; j < row_type->vector_elements; j++) { + ir_constant *row_index = new ir_constant(glsl_int_type, &i); + ir_dereference *const row_access = + new ir_dereference(declarations[16], row_index); + + ir_dereference *const component_access = + new ir_dereference(row_access); + + component_access->selector.swizzle.x = j; + component_access->selector.swizzle.num_components = 1; + + const unsigned param = (i * row_type->vector_elements) + j; + ir_dereference *const rhs = new ir_dereference(declarations[param]); + + inst = new ir_assignment(component_access, rhs, NULL); + instructions->push_tail(inst); + } + } + + ir_dereference *retval = new ir_dereference(declarations[16]); + + inst = new ir_return((ir_expression *) retval); + instructions->push_tail(inst); +} + + +/** + * Generate the constructors for a set of GLSL types + * + * Constructor implementations are added to \c instructions, and the symbols + * are added to \c symtab. + */ +static void +generate_constructor(glsl_symbol_table *symtab, const struct glsl_type *types, + unsigned num_types, exec_list *instructions) +{ + ir_variable *declarations[17]; + + for (unsigned i = 0; i < num_types; i++) { + /* Only numeric and boolean vectors and matrices get constructors here. + * Structures need to be handled elsewhere. It is expected that scalar + * constructors are never actually called, so they are not generated. + */ + if (!types[i].is_numeric() && !types[i].is_boolean()) + continue; + + if (types[i].is_scalar()) + continue; + + /* Generate the function name and add it to the symbol table. + */ + ir_function *const f = new ir_function(types[i].name); + + bool added = symtab->add_function(types[i].name, f); + assert(added); + + + /* Each type has several basic constructors. The total number of forms + * depends on the derived type. + * + * Vectors: 1 scalar, N scalars + * Matrices: 1 scalar, NxM scalars + * + * Several possible types of constructors are not included in this list. + * + * Scalar constructors are not included. The expectation is that the + * IR generator won't actually generate these as constructor calls. The + * expectation is that it will just generate the necessary type + * conversion. + * + * Matrix contructors from matrices are also not included. The + * expectation is that the IR generator will generate a call to the + * appropriate from-scalars constructor. + */ + ir_function_signature *const sig = new ir_function_signature(& types[i]); + f->signatures.push_tail(sig); + + generate_constructor_intro(& types[i], 1, & sig->parameters, + instructions, declarations); + + if (types[i].is_vector()) { + generate_vec_body_from_scalar(instructions, declarations); + + ir_function_signature *const vec_sig = + new ir_function_signature(& types[i]); + f->signatures.push_tail(vec_sig); + + generate_constructor_intro(& types[i], types[i].vector_elements, + & vec_sig->parameters, instructions, + declarations); + generate_vec_body_from_N_scalars(instructions, declarations); + } else { + assert(types[i].is_matrix()); + + generate_mat_body_from_scalar(instructions, declarations); + + ir_function_signature *const mat_sig = + new ir_function_signature(& types[i]); + f->signatures.push_tail(mat_sig); + + generate_constructor_intro(& types[i], + (types[i].vector_elements + * types[i].matrix_columns), + & mat_sig->parameters, instructions, + declarations); + generate_mat_body_from_N_scalars(instructions, declarations); + } + } +} + + +void +generate_110_constructors(glsl_symbol_table *symtab, exec_list *instructions) +{ + generate_constructor(symtab, builtin_core_types, + Elements(builtin_core_types), instructions); +} + + +void +generate_120_constructors(glsl_symbol_table *symtab, exec_list *instructions) +{ + generate_110_constructors(symtab, instructions); + + generate_constructor(symtab, builtin_120_types, + Elements(builtin_120_types), instructions); +} + + +void +generate_130_constructors(glsl_symbol_table *symtab, exec_list *instructions) +{ + generate_120_constructors(symtab, instructions); + + generate_constructor(symtab, builtin_130_types, + Elements(builtin_130_types), instructions); +} + + +void +_mesa_glsl_initialize_constructors(exec_list *instructions, + struct _mesa_glsl_parse_state *state) +{ + switch (state->language_version) { + case 110: + generate_110_constructors(state->symbols, instructions); + break; + case 120: + generate_120_constructors(state->symbols, instructions); + break; + case 130: + generate_130_constructors(state->symbols, instructions); + break; + default: + /* error */ + break; + } +} + + const glsl_type * glsl_type::get_instance(unsigned base_type, unsigned rows, unsigned columns) { diff --git a/glsl_types.h b/glsl_types.h index 96c9a1b2a48..a795af2cd38 100644 --- a/glsl_types.h +++ b/glsl_types.h @@ -288,6 +288,10 @@ extern "C" { extern void _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *state); +extern void +_mesa_glsl_initialize_constructors(struct exec_list *instructions, + struct _mesa_glsl_parse_state *state); + #ifdef __cplusplus } #endif