glsl/glasm: Pass and use scaling parameters in shaders

src/shader_recompiler/backend/glasm/emit_glasm.cpp

@@ -448,6 +448,9 @@ std::string EmitGLASM(const Profile& profile, const RuntimeInfo& runtime_info, I
         header += fmt::format("SHARED_MEMORY {};", program.shared_memory_size);
         header += fmt::format("SHARED shared_mem[]={{program.sharedmem}};");
     }
+    if (program.info.uses_rescaling_uniform) {
+        header += "PARAM scaling[1]={program.local[0..0]};";
+    }
     header += "TEMP ";
     for (size_t index = 0; index < ctx.reg_alloc.NumUsedRegisters(); ++index) {
         header += fmt::format("R{},", index);

src/shader_recompiler/backend/glasm/emit_glasm_image.cpp

@@ -612,8 +612,9 @@ void EmitIsTextureScaled(EmitContext& ctx, IR::Inst& inst, const IR::Value& inde
     if (!index.IsImmediate()) {
         throw NotImplementedException("Non-constant texture rescaling");
     }
-    UNIMPLEMENTED();
-    ctx.Add("MOV.S {}.x,-1;", inst);
+    ctx.Add("AND.U RC.x,scaling[0].x,{};"
+            "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,

src/shader_recompiler/backend/glasm/emit_glasm_not_implemented.cpp

@@ -211,7 +211,7 @@ void EmitYDirection(EmitContext& ctx, IR::Inst& inst) {
 }
 
 void EmitResolutionDownFactor(EmitContext& ctx, IR::Inst& inst) {
-    ctx.Add("MOV.F {}.x,program.env[0].x;", inst);
+    ctx.Add("MOV.F {}.x,scaling[0].y;", inst);
 }
 
 void EmitUndefU1(EmitContext& ctx, IR::Inst& inst) {