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Add an implementation of gentype-only clamp().

This commit is contained in:
Eric Anholt 2010-04-08 15:41:19 -07:00
parent cc4ef154e6
commit a3fa3fbf76
1 changed files with 18 additions and 1 deletions
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19
builtin_function.cpp
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@ -187,6 +187,23 @@ generate_max(exec_list *instructions,
generate_binop(instructions, declarations, type, ir_binop_max);
}
static void
generate_clamp(exec_list *instructions,
ir_variable **declarations,
const glsl_type *type)
{
ir_dereference *const x = new ir_dereference(declarations[0]);
ir_dereference *const minval = new ir_dereference(declarations[1]);
ir_dereference *const maxval = new ir_dereference(declarations[2]);
ir_rvalue *result;
result = new ir_expression(ir_binop_min, type, x, maxval);
result = new ir_expression(ir_binop_max, type, result, minval);
ir_instruction *inst = new ir_return(result);
instructions->push_tail(inst);
}
static void
generate_mix_vec(exec_list *instructions,
ir_variable **declarations,
@ -750,7 +767,7 @@ generate_110_functions(glsl_symbol_table *symtab, exec_list *instructions)
/* FINISHME: min(x, float y) */
make_gentype_function(symtab, instructions, "max", 2, generate_max);
/* FINISHME: max(x, float y) */
/* FINISHME: clamp() */
make_gentype_function(symtab, instructions, "clamp", 3, generate_clamp);
/* FINISHME: clamp() */
make_gentype_function(symtab, instructions, "mix", 3, generate_mix_vec);
/* FINISHME: mix() */