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glsl: Implement indexed attribute loads

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This commit is contained in:
ameerj 2021-06-07 20:39:30 -04:00
parent 2a504b4765
commit c542204113
5 changed files with 64 additions and 29 deletions
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42
src/shader_recompiler/backend/glsl/emit_context.cpp
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@ -104,8 +104,22 @@ std::string_view SamplerType(TextureType type, bool is_depth) {
std::string_view ImageType(TextureType type) {
switch (type) {
case TextureType::Color1D:
return "uimage1D";
case TextureType::ColorArray1D:
return "uimage1DArray";
case TextureType::Color2D:
return "uimage2D";
case TextureType::ColorArray2D:
return "uimage2DArray";
case TextureType::Color3D:
return "uimage3D";
case TextureType::ColorCube:
return "uimageCube";
case TextureType::ColorArrayCube:
return "uimageCubeArray";
case TextureType::Buffer:
return "uimageBuffer";
default:
throw NotImplementedException("Image type: {}", type);
}
@ -250,6 +264,7 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
break;
case Stage::Fragment:
stage_name = "fs";
position_name = "gl_FragCoord";
break;
case Stage::Compute:
stage_name = "cs";
@ -449,6 +464,33 @@ void EmitContext::DefineHelperFunctions() {
if (info.uses_global_memory) {
header += DefineGlobalMemoryFunctions();
}
if (info.loads_indexed_attributes) {
const bool is_array{stage == Stage::Geometry};
const auto vertex_arg{is_array ? ",uint vertex" : ""};
std::string func{
fmt::format("float IndexedAttrLoad(int offset{}){{int base_index=offset>>2;uint "
"masked_index=uint(base_index)&3u;switch(base_index>>2){{",
vertex_arg)};
if (info.loads_position) {
func += fmt::format("case {}:", static_cast<u32>(IR::Attribute::PositionX) >> 2);
const auto position_idx{is_array ? "gl_in[vertex]." : ""};
func += fmt::format("return {}{}[masked_index];", position_idx, position_name);
}
const u32 base_attribute_value = static_cast<u32>(IR::Attribute::Generic0X) >> 2;
for (u32 i = 0; i < info.input_generics.size(); ++i) {
if (!info.input_generics[i].used) {
continue;
}
const auto vertex_idx{is_array ? "[vertex]" : ""};
func += fmt::format("case {}:", base_attribute_value + i);
func += fmt::format("return in_attr{}{}[masked_index];", i, vertex_idx);
}
func += "default: return 0.0;}}";
header += func;
}
if (info.stores_indexed_attributes) {
// TODO
}
}
std::string EmitContext::DefineGlobalMemoryFunctions() {