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glsl: convert reusable lower_precision util code into helper functions

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Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5746>
This commit is contained in:
Marek Olšák
2020-06-24 03:20:59 -04:00
parent 8d62969cfe
commit 161105d732
1 changed files with 34 additions and 27 deletions
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61
src/compiler/glsl/lower_precision.cpp
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@@ -107,7 +107,6 @@ public:
find_lowerable_rvalues_visitor(struct set *result,
const struct gl_shader_compiler_options *options);
bool can_lower_type(const glsl_type *type) const;
static void stack_enter(class ir_instruction *ir, void *data);
static void stack_leave(class ir_instruction *ir, void *data);
@@ -147,8 +146,9 @@ public:
virtual ir_visitor_status visit_leave(ir_expression *);
};
bool
find_lowerable_rvalues_visitor::can_lower_type(const glsl_type *type) const
static bool
can_lower_type(const struct gl_shader_compiler_options *options,
const glsl_type *type)
{
/* Don’t lower any expressions involving non-float types except bool and
* texture samplers. This will rule out operations that change the type such
@@ -290,7 +290,7 @@ enum find_lowerable_rvalues_visitor::can_lower_state
find_lowerable_rvalues_visitor::handle_precision(const glsl_type *type,
int precision) const
{
if (!can_lower_type(type))
if (!can_lower_type(options, type))
return CANT_LOWER;
switch (precision) {
@@ -332,7 +332,7 @@ find_lowerable_rvalues_visitor::visit(ir_constant *ir)
{
stack_enter(ir, this);
if (!can_lower_type(ir->type))
if (!can_lower_type(options, ir->type))
stack.back().state = CANT_LOWER;
stack_leave(ir, this);
@@ -396,7 +396,7 @@ find_lowerable_rvalues_visitor::visit_enter(ir_expression *ir)
{
ir_hierarchical_visitor::visit_enter(ir);
if (!can_lower_type(ir->type))
if (!can_lower_type(options, ir->type))
stack.back().state = CANT_LOWER;
/* Don't lower precision for derivative calculations */
@@ -564,6 +564,33 @@ find_lowerable_rvalues(const struct gl_shader_compiler_options *options,
assert(v.stack.empty());
}
static const glsl_type *
lower_glsl_type(const glsl_type *type)
{
glsl_base_type new_base_type;
switch (type->base_type) {
case GLSL_TYPE_FLOAT:
new_base_type = GLSL_TYPE_FLOAT16;
break;
case GLSL_TYPE_INT:
new_base_type = GLSL_TYPE_INT16;
break;
case GLSL_TYPE_UINT:
new_base_type = GLSL_TYPE_UINT16;
break;
default:
unreachable("invalid type");
return NULL;
}
return glsl_type::get_instance(new_base_type,
type->vector_elements,
type->matrix_columns,
type->explicit_stride,
type->interface_row_major);
}
static ir_rvalue *
convert_precision(glsl_base_type type, bool up, ir_rvalue *ir)
{
@@ -616,22 +643,6 @@ convert_precision(glsl_base_type type, bool up, ir_rvalue *ir)
return new(mem_ctx) ir_expression(op, desired_type, ir, NULL);
}
static glsl_base_type
lower_type(glsl_base_type type)
{
switch (type) {
case GLSL_TYPE_FLOAT:
return GLSL_TYPE_FLOAT16;
case GLSL_TYPE_INT:
return GLSL_TYPE_INT16;
case GLSL_TYPE_UINT:
return GLSL_TYPE_UINT16;
default:
unreachable("invalid type");
return GLSL_TYPE_ERROR;;
}
}
void
lower_precision_visitor::handle_rvalue(ir_rvalue **rvalue)
{
@@ -646,11 +657,7 @@ lower_precision_visitor::handle_rvalue(ir_rvalue **rvalue)
} else if (ir->type->base_type == GLSL_TYPE_FLOAT ||
ir->type->base_type == GLSL_TYPE_INT ||
ir->type->base_type == GLSL_TYPE_UINT) {
ir->type = glsl_type::get_instance(lower_type(ir->type->base_type),
ir->type->vector_elements,
ir->type->matrix_columns,
ir->type->explicit_stride,
ir->type->interface_row_major);
ir->type = lower_glsl_type(ir->type);
ir_constant *const_ir = ir->as_constant();