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glsl: Add passthrough geometry shader support

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This commit is contained in:
ameerj 2021-06-24 20:13:21 -04:00
parent 41b2a991c4
commit 0810714e46
3 changed files with 27 additions and 7 deletions
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30
src/shader_recompiler/backend/glsl/emit_context.cpp
View file

@ -236,6 +236,9 @@ void SetupOutPerVertex(EmitContext& ctx, std::string& header) {
if (!StoresPerVertexAttributes(ctx.stage)) {
return;
}
if (ctx.uses_geometry_passthrough) {
return;
}
header += "out gl_PerVertex{vec4 gl_Position;";
if (ctx.info.stores[IR::Attribute::PointSize]) {
header += "float gl_PointSize;";
@ -272,12 +275,13 @@ void SetupLegacyInPerFragment(EmitContext& ctx, std::string& header) {
EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile& profile_,
const RuntimeInfo& runtime_info_)
: info{program.info}, profile{profile_}, runtime_info{runtime_info_} {
: info{program.info}, profile{profile_}, runtime_info{runtime_info_}, stage{program.stage},
uses_geometry_passthrough{program.is_geometry_passthrough &&
profile.support_geometry_shader_passthrough} {
if (profile.need_fastmath_off) {
header += "#pragma optionNV(fastmath off)\n";
}
SetupExtensions();
stage = program.stage;
switch (program.stage) {
case Stage::VertexA:
case Stage::VertexB:
@ -295,10 +299,17 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
break;
case Stage::Geometry:
stage_name = "gs";
header += fmt::format("layout({})in;layout({},max_vertices={})out;"
"in gl_PerVertex{{vec4 gl_Position;}}gl_in[];",
InputPrimitive(runtime_info.input_topology),
OutputPrimitive(program.output_topology), program.output_vertices);
header += fmt::format("layout({})in;", InputPrimitive(runtime_info.input_topology));
if (uses_geometry_passthrough) {
header += "layout(passthrough)in gl_PerVertex{vec4 gl_Position;};";
break;
} else if (program.is_geometry_passthrough &&
!profile.support_geometry_shader_passthrough) {
LOG_WARNING(Shader_GLSL, "Passthrough geometry program used but not supported");
}
header += fmt::format(
"layout({},max_vertices={})out;in gl_PerVertex{{vec4 gl_Position;}}gl_in[];",
OutputPrimitive(program.output_topology), program.output_vertices);
break;
case Stage::Fragment:
stage_name = "fs";
@ -329,7 +340,9 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
if (!info.loads.Generic(index) || !runtime_info.previous_stage_stores.Generic(index)) {
continue;
}
header += fmt::format("layout(location={}){}in vec4 in_attr{}{};", index,
const auto qualifier{uses_geometry_passthrough ? "passthrough"
: fmt::format("location={}", index)};
header += fmt::format("layout({}){}in vec4 in_attr{}{};", qualifier,
InterpDecorator(info.interpolation[index]), index,
InputArrayDecorator(stage));
}
@ -412,6 +425,9 @@ void EmitContext::SetupExtensions() {
if (info.uses_derivatives && profile.support_gl_derivative_control) {
header += "#extension GL_ARB_derivative_control : enable\n";
}
if (uses_geometry_passthrough) {
header += "#extension GL_NV_geometry_shader_passthrough : enable\n";
}
}
void EmitContext::DefineConstantBuffers(Bindings& bindings) {

1
src/shader_recompiler/backend/glsl/emit_context.h
View file

@ -157,6 +157,7 @@ public:
bool uses_y_direction{};
bool uses_cc_carry{};
bool uses_geometry_passthrough{};
private:
void SetupExtensions();

3
src/shader_recompiler/backend/glsl/emit_glsl_special.cpp
View file

@ -17,6 +17,9 @@ std::string_view OutputVertexIndex(EmitContext& ctx) {
}
void InitializeOutputVaryings(EmitContext& ctx) {
if (ctx.uses_geometry_passthrough) {
return;
}
if (ctx.stage == Stage::VertexB || ctx.stage == Stage::Geometry) {
ctx.Add("gl_Position=vec4(0,0,0,1);");
}