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glsl: Implement tessellation shaders

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This commit is contained in:
ameerj 2021-05-31 23:07:13 -04:00
parent c7d085b505
commit 8c684b3e23
5 changed files with 146 additions and 27 deletions
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90
src/shader_recompiler/backend/glsl/emit_context.cpp
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@ -21,10 +21,21 @@ std::string_view InterpDecorator(Interpolation interp) {
throw InvalidArgument("Invalid interpolation {}", interp);
}
std::string_view ArrayDecorator(Stage stage) {
std::string_view InputArrayDecorator(Stage stage) {
switch (stage) {
case Stage::Geometry:
return "[1]";
case Stage::TessellationControl:
case Stage::TessellationEval:
return "[]";
default:
return "";
}
}
std::string OutputDecorator(Stage stage, u32 size) {
switch (stage) {
case Stage::TessellationControl:
return fmt::format("[{}]", size);
default:
return "";
}
@ -73,6 +84,30 @@ std::string_view SamplerType(TextureType type, bool is_depth) {
}
}
std::string_view GetTessMode(TessPrimitive primitive) {
switch (primitive) {
case TessPrimitive::Triangles:
return "triangles";
case TessPrimitive::Quads:
return "quads";
case TessPrimitive::Isolines:
return "isolines";
}
throw InvalidArgument("Invalid tessellation primitive {}", primitive);
}
std::string_view GetTessSpacing(TessSpacing spacing) {
switch (spacing) {
case TessSpacing::Equal:
return "equal_spacing";
case TessSpacing::FractionalOdd:
return "fractional_odd_spacing";
case TessSpacing::FractionalEven:
return "fractional_even_spacing";
}
throw InvalidArgument("Invalid tessellation spacing {}", spacing);
}
std::string_view InputPrimitive(InputTopology topology) {
switch (topology) {
case InputTopology::Points:
@ -100,6 +135,23 @@ std::string_view OutputPrimitive(OutputTopology topology) {
}
throw InvalidArgument("Invalid output topology {}", topology);
}
void SetupOutPerVertex(Stage stage, const Info& info, std::string& header) {
if (stage != Stage::VertexA && stage != Stage::VertexB && stage != Stage::Geometry) {
return;
}
header += "out gl_PerVertex{";
if (info.stores_position) {
header += "vec4 gl_Position;";
}
if (info.stores_point_size) {
header += "float gl_PointSize;";
}
if (info.stores_clip_distance) {
header += "float gl_ClipDistance[];";
}
header += "};";
}
} // namespace
EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile& profile_,
@ -111,17 +163,20 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
case Stage::VertexA:
case Stage::VertexB:
stage_name = "vs";
// TODO: add only what's used by the shader
header +=
"out gl_PerVertex {vec4 gl_Position;float gl_PointSize;float gl_ClipDistance[];};";
break;
case Stage::TessellationControl:
stage_name = "tsc";
header += fmt::format("layout(vertices={})out;\n", program.invocations);
break;
case Stage::TessellationEval:
stage_name = "ts";
stage_name = "tse";
header += fmt::format("layout({},{},{})in;\n", GetTessMode(runtime_info.tess_primitive),
GetTessSpacing(runtime_info.tess_spacing),
runtime_info.tess_clockwise ? "cw" : "ccw");
break;
case Stage::Geometry:
stage_name = "gs";
header += fmt::format("layout({})in;layout({}, max_vertices={})out;\n",
header += fmt::format("layout({})in;layout({},max_vertices={})out;\n",
InputPrimitive(runtime_info.input_topology),
OutputPrimitive(program.output_topology), program.output_vertices);
break;
@ -135,12 +190,23 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
program.workgroup_size[2]);
break;
}
SetupOutPerVertex(stage, info, header);
for (size_t index = 0; index < info.input_generics.size(); ++index) {
const auto& generic{info.input_generics[index]};
if (generic.used) {
header +=
fmt::format("layout(location={}){} in vec4 in_attr{}{};", index,
InterpDecorator(generic.interpolation), index, ArrayDecorator(stage));
header += fmt::format("layout(location={}){} in vec4 in_attr{}{};", index,
InterpDecorator(generic.interpolation), index,
InputArrayDecorator(stage));
}
}
for (size_t index = 0; index < info.uses_patches.size(); ++index) {
if (!info.uses_patches[index]) {
continue;
}
if (stage == Stage::TessellationControl) {
header += fmt::format("layout(location={})patch out vec4 patch{};", index, index);
} else {
header += fmt::format("layout(location={})patch in vec4 patch{};", index, index);
}
}
for (size_t index = 0; index < info.stores_frag_color.size(); ++index) {
@ -151,8 +217,8 @@ 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)};
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;
}