From f7352411f08c3a099b753d290540bb7c02fecac3 Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Thu, 24 Jun 2021 20:13:21 -0400
Subject: glsl: Add passthrough geometry shader support
---
.../backend/glsl/emit_context.cpp | 30 +++++++++++++++++-----
1 file changed, 23 insertions(+), 7 deletions(-)
(limited to 'src/shader_recompiler/backend/glsl/emit_context.cpp')
diff --git a/src/shader_recompiler/backend/glsl/emit_context.cpp b/src/shader_recompiler/backend/glsl/emit_context.cpp
index 0d7f7bc3ba..36527bbd4b 100644
--- a/src/shader_recompiler/backend/glsl/emit_context.cpp
+++ b/src/shader_recompiler/backend/glsl/emit_context.cpp
@@ -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) {
--
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