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glsl: add capability to lower mediump array types

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This is not needed for lowering expressions, because they always work with
basic types, but it will be needed for lowering variables.

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
2020-07-01 16:49:04 -04:00
parent 38cadd8b46
commit 63ab8d41d1
1 changed files with 48 additions and 29 deletions
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77
src/compiler/glsl/lower_precision.cpp
View File

@@ -155,7 +155,7 @@ can_lower_type(const struct gl_shader_compiler_options *options,
* boolean types so that it will do comparisons as 16-bit.
*/
switch (type->base_type) {
switch (type->without_array()->base_type) {
/* TODO: should we do anything for these two with regard to Int16 vs FP16
* support?
*/
@@ -626,23 +626,46 @@ find_lowerable_rvalues(const struct gl_shader_compiler_options *options,
}
static const glsl_type *
lower_glsl_type(const glsl_type *type)
convert_type(bool up, const glsl_type *type)
{
if (type->is_array()) {
return glsl_type::get_array_instance(convert_type(up, type->fields.array),
type->array_size(),
type->explicit_stride);
}
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;
if (up) {
switch (type->base_type) {
case GLSL_TYPE_FLOAT16:
new_base_type = GLSL_TYPE_FLOAT;
break;
case GLSL_TYPE_INT16:
new_base_type = GLSL_TYPE_INT;
break;
case GLSL_TYPE_UINT16:
new_base_type = GLSL_TYPE_UINT;
break;
default:
unreachable("invalid type");
return NULL;
}
} else {
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,
@@ -652,23 +675,26 @@ lower_glsl_type(const glsl_type *type)
type->interface_row_major);
}
static const glsl_type *
lower_glsl_type(const glsl_type *type)
{
return convert_type(false, type);
}
static ir_rvalue *
convert_precision(bool up, ir_rvalue *ir)
{
unsigned new_type, op;
unsigned op;
if (up) {
switch (ir->type->base_type) {
switch (ir->type->without_array()->base_type) {
case GLSL_TYPE_FLOAT16:
new_type = GLSL_TYPE_FLOAT;
op = ir_unop_f162f;
break;
case GLSL_TYPE_INT16:
new_type = GLSL_TYPE_INT;
op = ir_unop_i2i;
break;
case GLSL_TYPE_UINT16:
new_type = GLSL_TYPE_UINT;
op = ir_unop_u2u;
break;
default:
@@ -676,17 +702,14 @@ convert_precision(bool up, ir_rvalue *ir)
return NULL;
}
} else {
switch (ir->type->base_type) {
switch (ir->type->without_array()->base_type) {
case GLSL_TYPE_FLOAT:
new_type = GLSL_TYPE_FLOAT16;
op = ir_unop_f2fmp;
break;
case GLSL_TYPE_INT:
new_type = GLSL_TYPE_INT16;
op = ir_unop_i2imp;
break;
case GLSL_TYPE_UINT:
new_type = GLSL_TYPE_UINT16;
op = ir_unop_u2ump;
break;
default:
@@ -695,11 +718,7 @@ convert_precision(bool up, ir_rvalue *ir)
}
}
const glsl_type *desired_type;
desired_type = glsl_type::get_instance(new_type,
ir->type->vector_elements,
ir->type->matrix_columns);
const glsl_type *desired_type = convert_type(up, ir->type);
void *mem_ctx = ralloc_parent(ir);
return new(mem_ctx) ir_expression(op, desired_type, ir, NULL);
}