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glsl: Implement transform feedback

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This commit is contained in:
ameerj 2021-06-02 00:33:03 -04:00
parent 31147ffe69
commit f4799e8fa1
4 changed files with 76 additions and 18 deletions
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53
src/shader_recompiler/backend/glsl/emit_context.cpp
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@ -37,7 +37,6 @@ bool StoresPerVertexAttributes(Stage stage) {
case Stage::VertexA:
case Stage::VertexB:
case Stage::Geometry:
case Stage::TessellationControl:
case Stage::TessellationEval:
return true;
default:
@ -154,9 +153,7 @@ void SetupOutPerVertex(Stage stage, const Info& info, std::string& header) {
return;
}
header += "out gl_PerVertex{";
if (info.stores_position) {
header += "vec4 gl_Position;";
}
header += "vec4 gl_Position;";
if (info.stores_point_size) {
header += "float gl_PointSize;";
}
@ -236,10 +233,8 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
}
for (size_t index = 0; index < info.stores_generics.size(); ++index) {
// TODO: Properly resolve attribute issues
const auto declaration{fmt::format("layout(location={}) out vec4 out_attr{}{};", index,
index, OutputDecorator(stage, program.invocations))};
if (info.stores_generics[index] || stage == Stage::VertexA || stage == Stage::VertexB) {
header += declaration;
DefineGenericOutput(index, program.invocations);
}
}
header += "\n";
@ -312,13 +307,53 @@ void EmitContext::DefineStorageBuffers(Bindings& bindings) {
}
}
void EmitContext::DefineGenericOutput(size_t index, u32 invocations) {
static constexpr std::string_view swizzle{"xyzw"};
const size_t base_index{static_cast<size_t>(IR::Attribute::Generic0X) + index * 4};
u32 element{0};
while (element < 4) {
std::string definition{fmt::format("layout(location={}", index)};
const u32 remainder{4 - element};
const TransformFeedbackVarying* xfb_varying{};
if (!runtime_info.xfb_varyings.empty()) {
xfb_varying = &runtime_info.xfb_varyings[base_index + element];
xfb_varying = xfb_varying && xfb_varying->components > 0 ? xfb_varying : nullptr;
}
const u32 num_components{xfb_varying ? xfb_varying->components : remainder};
if (element > 0) {
definition += fmt::format(",component={}", element);
}
if (xfb_varying) {
definition +=
fmt::format(",xfb_buffer={},xfb_stride={},xfb_offset={}", xfb_varying->buffer,
xfb_varying->stride, xfb_varying->offset);
}
std::string name{fmt::format("out_attr{}", index)};
if (num_components < 4 || element > 0) {
name += fmt::format("_{}", swizzle.substr(element, num_components));
}
const auto type{num_components == 1 ? "float" : fmt::format("vec{}", num_components)};
definition += fmt::format(")out {} {}{};", type, name, OutputDecorator(stage, invocations));
header += definition;
const GenericElementInfo element_info{
.name = name,
.first_element = element,
.num_components = num_components,
};
std::fill_n(output_generics[index].begin() + element, num_components, element_info);
element += num_components;
}
header += "\n";
}
void EmitContext::DefineHelperFunctions() {
if (info.uses_global_increment || info.uses_shared_increment) {
header += "uint CasIncrement(uint op_a,uint op_b){return(op_a>=op_b)?0u:(op_a+1u);}\n";
}
if (info.uses_global_decrement || info.uses_shared_decrement) {
header +=
"uint CasDecrement(uint op_a,uint op_b){return(op_a==0||op_a>op_b)?op_b:(op_a-1u);}\n";
header += "uint CasDecrement(uint op_a,uint "
"op_b){return(op_a==0||op_a>op_b)?op_b:(op_a-1u);}\n";
}
if (info.uses_atomic_f32_add) {
header += "uint CasFloatAdd(uint op_a,float op_b){return "