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video_core, shader_recompiler: Improve Princess Peach: Showtime! support and performance

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1. Add geometry shader support for Princess Peach: Showtime!:
   - Implement proper EmitInvocationInfo handling for geometry shaders
   - Support input topology vertex counting in all shader backends (GLASM, GLSL, SPIRV)

2. Performance optimizations:
   - Replace InputTopologyVertices switch statement with a constexpr lookup table
   - Pre-calculate vertex counts and shifts to reduce register pressure
   - Eliminate redundant calculations in shader backends

Signed-off-by: Zephyron <zephyron@citron-emu.org>
This commit is contained in:
Zephyron
2025-05-11 16:28:25 +10:00
parent 9bb2b769a4
commit 2e6bcc9ea6
4 changed files with 34 additions and 0 deletions
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6
src/shader_recompiler/backend/glsl/emit_glsl_context_get_set.cpp
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@@ -426,6 +426,12 @@ void EmitInvocationInfo(EmitContext& ctx, IR::Inst& inst) {
case Stage::TessellationEval:
ctx.AddU32("{}=uint(gl_PatchVerticesIn)<<16;", inst);
break;
case Stage::Geometry: {
// Pre-calculate the vertex count for better performance
const u32 vertex_count = InputTopologyVertices::vertices(ctx.runtime_info.input_topology);
ctx.AddU32("{}={}u;", inst, vertex_count << 16);
break;
}
default:
LOG_WARNING(Shader, "(STUBBED) called");
ctx.AddU32("{}=uint(0x00ff0000);", inst);