shader: Implement VMAD, VMNMX, VSETP

src/shader_recompiler/frontend/maxwell/translate/impl/video_helper.cpp

@@ -0,0 +1,30 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "shader_recompiler/exception.h"
+#include "shader_recompiler/frontend/maxwell/translate/impl/video_helper.h"
+
+namespace Shader::Maxwell {
+
+IR::U32 ExtractVideoOperandValue(IR::IREmitter& ir, const IR::U32& value, VideoWidth width,
+                                 u32 selector, bool is_signed) {
+    switch (width) {
+    case VideoWidth::Byte:
+    case VideoWidth::Unknown:
+        return ir.BitFieldExtract(value, ir.Imm32(selector * 8), ir.Imm32(8), is_signed);
+    case VideoWidth::Short:
+        return ir.BitFieldExtract(value, ir.Imm32(selector * 16), ir.Imm32(16), is_signed);
+    case VideoWidth::Word:
+        return value;
+    default:
+        throw NotImplementedException("Unknown VideoWidth {}", width);
+    }
+}
+
+VideoWidth GetVideoSourceWidth(VideoWidth width, bool is_immediate) {
+    // immediates must be 16-bit format.
+    return is_immediate ? VideoWidth::Short : width;
+}
+
+} // namespace Shader::Maxwell