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

Thanks for everything!

2 files changed, 9 insertions, 1 deletions

diff --git a/src/shader_recompiler/backend/glsl/emit_glsl_context_get_set.cpp b/src/shader_recompiler/backend/glsl/emit_glsl_context_get_set.cpp
index 542a79230..4c26f3829 100644
--- a/src/shader_recompiler/backend/glsl/emit_glsl_context_get_set.cpp
+++ b/src/shader_recompiler/backend/glsl/emit_glsl_context_get_set.cpp
@@ -446,7 +446,7 @@ void EmitYDirection(EmitContext& ctx, IR::Inst& inst) {
 }
 
 void EmitResolutionDownFactor(EmitContext& ctx, IR::Inst& inst) {
-    ctx.AddF32("{}=scaling.y;", inst);
+    ctx.AddF32("{}=scaling.z;", inst);
 }
 
 void EmitLoadLocal(EmitContext& ctx, IR::Inst& inst, std::string_view word_offset) {
diff --git a/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp b/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp
index 82b6f0d77..2f78d0267 100644
--- a/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp
+++ b/src/shader_recompiler/backend/glsl/emit_glsl_image.cpp
@@ -620,6 +620,14 @@ void EmitIsTextureScaled(EmitContext& ctx, IR::Inst& inst, const IR::Value& inde
     ctx.AddU1("{}=(ftou(scaling.x)&{})!=0;", inst, 1u << image_index);
 }
 
+void EmitIsImageScaled(EmitContext& ctx, IR::Inst& inst, const IR::Value& index) {
+    if (!index.IsImmediate()) {
+        throw NotImplementedException("Non-constant texture rescaling");
+    }
+    const u32 image_index{index.U32()};
+    ctx.AddU1("{}=(ftou(scaling.y)&{})!=0;", inst, 1u << image_index);
+}
+
 void EmitBindlessImageSampleImplicitLod(EmitContext&) {
     NotImplemented();
 }