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spirv: add support for KHR_fragment_shading_rate

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v2: Use VARYING (Samuel)

v3: Only allow VERTEX & GEOMETRY stages (Samuel)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7795>
This commit is contained in:
Lionel Landwerlin
2020-10-20 10:41:48 +03:00
committed by Marge Bot
parent 244514addd
commit a5b899c7da
3 changed files with 18 additions and 0 deletions
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1
src/compiler/shader_info.h
View File

@@ -49,6 +49,7 @@ struct spirv_supported_capabilities {
bool float64_atomic_add;
bool fragment_shader_sample_interlock;
bool fragment_shader_pixel_interlock;
bool fragment_shading_rate;
bool generic_pointers;
bool geometry_streams;
bool image_ms_array;

4
src/compiler/spirv/spirv_to_nir.c
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@@ -4456,6 +4456,10 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
spv_check_supported(image_atomic_int64, cap);
break;
case SpvCapabilityFragmentShadingRateKHR:
spv_check_supported(fragment_shading_rate, cap);
break;
default:
vtn_fail("Unhandled capability: %s (%u)",
spirv_capability_to_string(cap), cap);

13
src/compiler/spirv/vtn_variables.c
View File

@@ -1107,6 +1107,19 @@ vtn_get_builtin_location(struct vtn_builder *b,
*location = SYSTEM_VALUE_RAY_GEOMETRY_INDEX;
set_mode_system_value(b, mode);
break;
case SpvBuiltInShadingRateKHR:
*location = SYSTEM_VALUE_FRAG_SHADING_RATE;
set_mode_system_value(b, mode);
break;
case SpvBuiltInPrimitiveShadingRateKHR:
if (b->shader->info.stage == MESA_SHADER_VERTEX ||
b->shader->info.stage == MESA_SHADER_GEOMETRY) {
*location = VARYING_SLOT_PRIMITIVE_SHADING_RATE;
*mode = nir_var_shader_out;
} else {
vtn_fail("invalid stage for SpvBuiltInPrimitiveShadingRateKHR");
}
break;
default:
vtn_fail("Unsupported builtin: %s (%u)",
spirv_builtin_to_string(builtin), builtin);