video: Import new shader recompiler + display a triangle (#142)

src/shader_recompiler/frontend/translate/export.cpp

@@ -0,0 +1,49 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "shader_recompiler/frontend/translate/translate.h"
+
+namespace Shader::Gcn {
+
+void Translator::EXP(const GcnInst& inst) {
+    const auto& exp = inst.control.exp;
+    const IR::Attribute attrib{exp.target};
+    const std::array vsrc = {
+        IR::VectorReg(inst.src[0].code),
+        IR::VectorReg(inst.src[1].code),
+        IR::VectorReg(inst.src[2].code),
+        IR::VectorReg(inst.src[3].code),
+    };
+
+    const auto unpack = [&](u32 idx) {
+        const IR::Value value = ir.UnpackHalf2x16(ir.GetVectorReg(vsrc[idx]));
+        const IR::F32 r = IR::F32{ir.CompositeExtract(value, 0)};
+        const IR::F32 g = IR::F32{ir.CompositeExtract(value, 1)};
+        ir.SetAttribute(attrib, r, idx * 2);
+        ir.SetAttribute(attrib, g, idx * 2 + 1);
+    };
+
+    // Components are float16 packed into a VGPR
+    if (exp.compr) {
+        // Export R, G
+        if (exp.en & 1) {
+            unpack(0);
+        }
+        // Export B, A
+        if ((exp.en >> 2) & 1) {
+            unpack(1);
+        }
+    } else {
+        // Components are float32 into separate VGPRS
+        u32 mask = exp.en;
+        for (u32 i = 0; i < 4; i++, mask >>= 1) {
+            if ((mask & 1) == 0) {
+                continue;
+            }
+            const IR::F32 comp = ir.GetVectorReg<IR::F32>(vsrc[i]);
+            ir.SetAttribute(attrib, comp, i);
+        }
+    }
+}
+
+} // namespace Shader::Gcn