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vk_shader_decompiler: Implement Layer output attribute 

SPIR-V's Layer is GLSL's gl_Layer. It lets the application choose from a
shader stage (vertex, tessellation or geometry) which framebuffer layer
write the output fragments to.
This commit is contained in:
ReinUsesLisp 2020-02-16 02:40:17 -03:00
parent f552d553ba
commit 1caf3f11c8
1 changed files with 30 additions and 6 deletions
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36
src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
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@ -86,6 +86,7 @@ struct AttributeType {
struct VertexIndices {
std::optional<u32> position;
std::optional<u32> layer;
std::optional<u32> viewport;
std::optional<u32> point_size;
std::optional<u32> clip_distances;
@ -282,9 +283,11 @@ public:
AddExtension("SPV_KHR_storage_buffer_storage_class");
AddExtension("SPV_KHR_variable_pointers");
if (ir.UsesViewportIndex()) {
AddCapability(spv::Capability::MultiViewport);
if (device.IsExtShaderViewportIndexLayerSupported()) {
if (ir.UsesLayer() || ir.UsesViewportIndex()) {
if (ir.UsesViewportIndex()) {
AddCapability(spv::Capability::MultiViewport);
}
if (stage != ShaderType::Geometry && device.IsExtShaderViewportIndexLayerSupported()) {
AddExtension("SPV_EXT_shader_viewport_index_layer");
AddCapability(spv::Capability::ShaderViewportIndexLayerEXT);
}
@ -920,13 +923,22 @@ private:
VertexIndices indices;
indices.position = AddBuiltIn(t_float4, spv::BuiltIn::Position, "position");
if (ir.UsesLayer()) {
if (stage != ShaderType::Vertex || device.IsExtShaderViewportIndexLayerSupported()) {
indices.layer = AddBuiltIn(t_int, spv::BuiltIn::Layer, "layer");
} else {
LOG_ERROR(
Render_Vulkan,
"Shader requires Layer but it's not supported on this stage with this device.");
}
}
if (ir.UsesViewportIndex()) {
if (stage != ShaderType::Vertex || device.IsExtShaderViewportIndexLayerSupported()) {
indices.viewport = AddBuiltIn(t_int, spv::BuiltIn::ViewportIndex, "viewport_index");
} else {
LOG_ERROR(Render_Vulkan,
"Shader requires ViewportIndex but it's not supported on this "
"stage with this device.");
LOG_ERROR(Render_Vulkan, "Shader requires ViewportIndex but it's not supported on "
"this stage with this device.");
}
}
@ -1285,6 +1297,13 @@ private:
}
case Attribute::Index::LayerViewportPointSize:
switch (element) {
case 1: {
if (!out_indices.layer) {
return {};
}
const u32 index = out_indices.layer.value();
return {AccessElement(t_out_int, out_vertex, index), Type::Int};
}
case 2: {
if (!out_indices.viewport) {
return {};
@ -1355,6 +1374,11 @@ private:
UNIMPLEMENTED();
}
if (!target.id) {
// On failure we return a nullptr target.id, skip these stores.
return {};
}
OpStore(target.id, As(Visit(src), target.type));
return {};
}