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Implement builtin length() function.

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Eric Anholt 2010-03-27 13:55:04 -07:00 • committed by Ian Romanick
parent 44d68fd06f
commit 53afc3609d
1 changed files with 51 additions and 6 deletions
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57
builtin_function.cpp
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@ -157,6 +157,7 @@ generate_function_instance(ir_function *f,
void (*generate)(exec_list *instructions,
ir_variable **declarations,
const glsl_type *type),
const glsl_type *ret_type,
const glsl_type *type)
{
ir_variable *declarations[17];
@ -184,7 +185,7 @@ generate_function_instance(ir_function *f,
declarations[i] = var;
}
ir_variable *retval = new ir_variable(type, "__retval");
ir_variable *retval = new ir_variable(ret_type, "__retval");
instructions->push_tail(retval);
declarations[16] = retval;
@ -201,6 +202,7 @@ make_gentype_function(glsl_symbol_table *symtab, exec_list *instructions,
const glsl_type *type))
{
ir_function *const f = new ir_function(name);
const glsl_type *float_type = glsl_type::float_type;
const glsl_type *vec2_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, 2, 1);
const glsl_type *vec3_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, 3, 1);
const glsl_type *vec4_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, 4, 1);
@ -209,13 +211,56 @@ make_gentype_function(glsl_symbol_table *symtab, exec_list *instructions,
assert(added);
generate_function_instance(f, name, instructions, n_args, generate,
glsl_type::float_type);
float_type, float_type);
generate_function_instance(f, name, instructions, n_args, generate,
vec2_type);
vec2_type, vec2_type);
generate_function_instance(f, name, instructions, n_args, generate,
vec3_type);
vec3_type, vec3_type);
generate_function_instance(f, name, instructions, n_args, generate,
vec4_type);
vec4_type, vec4_type);
}
static void
generate_length(exec_list *instructions,
ir_variable **declarations,
const glsl_type *type)
{
ir_dereference *const retval = new ir_dereference(declarations[16]);
ir_dereference *const arg = new ir_dereference(declarations[0]);
ir_rvalue *result, *temp;
(void)type;
/* FINISHME: implement the abs(arg) variant for length(float f) */
temp = new ir_expression(ir_binop_dot, glsl_type::float_type, arg, arg);
result = new ir_expression(ir_unop_sqrt, glsl_type::float_type, temp, NULL);
ir_instruction *inst = new ir_assignment(retval, result, NULL);
instructions->push_tail(inst);
}
void
generate_length_functions(glsl_symbol_table *symtab, exec_list *instructions)
{
const char *name = "length";
ir_function *const f = new ir_function(name);
const glsl_type *float_type = glsl_type::float_type;
const glsl_type *vec2_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, 2, 1);
const glsl_type *vec3_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, 3, 1);
const glsl_type *vec4_type = glsl_type::get_instance(GLSL_TYPE_FLOAT, 4, 1);
bool added = symtab->add_function(name, f);
assert(added);
generate_function_instance(f, name, instructions, 1, generate_length,
float_type, float_type);
generate_function_instance(f, name, instructions, 1, generate_length,
float_type, vec2_type);
generate_function_instance(f, name, instructions, 1, generate_length,
float_type, vec3_type);
generate_function_instance(f, name, instructions, 1, generate_length,
float_type, vec4_type);
}
void
@ -258,7 +303,7 @@ generate_110_functions(glsl_symbol_table *symtab, exec_list *instructions)
/* FINISHME: smoothstep() */
/* FINISHME: floor() */
/* FINISHME: step() */
/* FINISHME: length() */
generate_length_functions(symtab, instructions);
/* FINISHME: distance() */
/* FINISHME: dot() */
/* FINISHME: cross() */