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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.
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1 changed files with 30 additions and 6 deletions
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@ -86,6 +86,7 @@ struct AttributeType {
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struct VertexIndices {
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std::optional<u32> position;
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std::optional<u32> layer;
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std::optional<u32> viewport;
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std::optional<u32> point_size;
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std::optional<u32> clip_distances;
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@ -282,9 +283,11 @@ public:
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AddExtension("SPV_KHR_storage_buffer_storage_class");
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AddExtension("SPV_KHR_variable_pointers");
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if (ir.UsesLayer() || ir.UsesViewportIndex()) {
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if (ir.UsesViewportIndex()) {
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AddCapability(spv::Capability::MultiViewport);
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if (device.IsExtShaderViewportIndexLayerSupported()) {
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}
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if (stage != ShaderType::Geometry && device.IsExtShaderViewportIndexLayerSupported()) {
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AddExtension("SPV_EXT_shader_viewport_index_layer");
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AddCapability(spv::Capability::ShaderViewportIndexLayerEXT);
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}
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@ -920,13 +923,22 @@ private:
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VertexIndices indices;
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indices.position = AddBuiltIn(t_float4, spv::BuiltIn::Position, "position");
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if (ir.UsesLayer()) {
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if (stage != ShaderType::Vertex || device.IsExtShaderViewportIndexLayerSupported()) {
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indices.layer = AddBuiltIn(t_int, spv::BuiltIn::Layer, "layer");
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} else {
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LOG_ERROR(
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Render_Vulkan,
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"Shader requires Layer but it's not supported on this stage with this device.");
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}
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}
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if (ir.UsesViewportIndex()) {
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if (stage != ShaderType::Vertex || device.IsExtShaderViewportIndexLayerSupported()) {
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indices.viewport = AddBuiltIn(t_int, spv::BuiltIn::ViewportIndex, "viewport_index");
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} else {
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LOG_ERROR(Render_Vulkan,
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"Shader requires ViewportIndex but it's not supported on this "
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"stage with this device.");
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LOG_ERROR(Render_Vulkan, "Shader requires ViewportIndex but it's not supported on "
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"this stage with this device.");
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}
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}
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@ -1285,6 +1297,13 @@ private:
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}
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case Attribute::Index::LayerViewportPointSize:
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switch (element) {
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case 1: {
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if (!out_indices.layer) {
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return {};
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}
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const u32 index = out_indices.layer.value();
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return {AccessElement(t_out_int, out_vertex, index), Type::Int};
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}
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case 2: {
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if (!out_indices.viewport) {
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return {};
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@ -1355,6 +1374,11 @@ private:
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UNIMPLEMENTED();
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}
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if (!target.id) {
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// On failure we return a nullptr target.id, skip these stores.
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return {};
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}
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OpStore(target.id, As(Visit(src), target.type));
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return {};
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}
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