shader: Properly scale image reads and add GL SPIR-V support

Thanks for everything!

1 files changed, 9 insertions, 0 deletions

diff --git a/src/shader_recompiler/backend/glasm/emit_glasm_image.cpp b/src/shader_recompiler/backend/glasm/emit_glasm_image.cpp
index 05e88cd97..d325d31c7 100644
--- a/src/shader_recompiler/backend/glasm/emit_glasm_image.cpp
+++ b/src/shader_recompiler/backend/glasm/emit_glasm_image.cpp
@@ -617,6 +617,15 @@ void EmitIsTextureScaled(EmitContext& ctx, IR::Inst& inst, const IR::Value& inde
             1u << index.U32(), ctx.reg_alloc.Define(inst));
 }
 
+void EmitIsImageScaled(EmitContext& ctx, IR::Inst& inst, const IR::Value& index) {
+    if (!index.IsImmediate()) {
+        throw NotImplementedException("Non-constant texture rescaling");
+    }
+    ctx.Add("AND.U RC.x,scaling[0].y,{};"
+            "SNE.S {},RC.x,0;",
+            1u << index.U32(), ctx.reg_alloc.Define(inst));
+}
+
 void EmitImageAtomicIAdd32(EmitContext& ctx, IR::Inst& inst, const IR::Value& index, Register coord,
                            ScalarU32 value) {
     ImageAtomic(ctx, inst, index, coord, value, "ADD.U32");