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vulkan: Emulate depth clip control when extension is not available. (#762)

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squidbus 2024-09-03 15:07:05 -07:00 • committed by GitHub
parent e340583a7f
commit b87e6f3838
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7 changed files with 38 additions and 12 deletions
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16
src/shader_recompiler/backend/spirv/emit_spirv_special.cpp
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@ -10,7 +10,21 @@ void EmitPrologue(EmitContext& ctx) {
ctx.DefineBufferOffsets();
}
void EmitEpilogue(EmitContext& ctx) {}
void ConvertDepthMode(EmitContext& ctx) {
const Id type{ctx.F32[1]};
const Id position{ctx.OpLoad(ctx.F32[4], ctx.output_position)};
const Id z{ctx.OpCompositeExtract(type, position, 2u)};
const Id w{ctx.OpCompositeExtract(type, position, 3u)};
const Id screen_depth{ctx.OpFMul(type, ctx.OpFAdd(type, z, w), ctx.Constant(type, 0.5f))};
const Id vector{ctx.OpCompositeInsert(ctx.F32[4], screen_depth, position, 2u)};
ctx.OpStore(ctx.output_position, vector);
}
void EmitEpilogue(EmitContext& ctx) {
if (ctx.stage == Stage::Vertex && ctx.runtime_info.vs_info.emulate_depth_negative_one_to_one) {
ConvertDepthMode(ctx);
}
}
void EmitDiscard(EmitContext& ctx) {
ctx.OpDemoteToHelperInvocationEXT();