shader: remove artificial sampled image and sampler pair limit

src/graphics/shader/recompiler/ir/ShaderIR.h

@@ -495,7 +495,6 @@ struct ShaderInfo {
 	static constexpr uint32_t MaxBufferRoots  = 64;
 	static constexpr uint32_t MaxImages       = 64;
 	static constexpr uint32_t MaxSamplers     = 32;
-	static constexpr uint32_t MaxSampledPairs = 64;
 
 	std::vector<BufferResource>      buffers;
 	std::vector<ImageResource>       images;

src/graphics/shader/recompiler/ir/passes/ResourceTracking.cpp

@@ -3823,9 +3823,6 @@ private:
 				return;
 			}
 		}
-		if (m_info.sampled_pairs.size() >= ShaderInfo::MaxSampledPairs) {
-			Fail(pc, "sampled image/sampler pair limit exceeded");
-		}
 		m_info.sampled_pairs.push_back({image, sampler, pc});
 	}
 

tests/ResourceTrackingTests.cpp

@@ -4929,6 +4929,38 @@ void TestImagesSamplersAndAliases() {
         "buffer/image descriptor alias was not linked");
 }
 
+void TestIndependentImageSamplerPairs() {
+  Fixture fixture(ShaderType::Pixel);
+  const auto address = fixture.ImageAddress();
+  MemoryInfo memory;
+  memory.kind = ResourceKind::Image;
+  memory.image_dimension = Decoder::ImageDimension::Dim2D;
+  for (uint32_t use = 0; use < 144; ++use) {
+    const auto pair = use % 72;
+    const auto pc = use * 4;
+    const auto image = fixture.Image(
+        {Value(pair / 8), Value(0u), Value(0u), Value(0u), Value(0u),
+         Value(0u), Value(0u), Value(0u)}, pc);
+    const auto sampler = fixture.Sampler(
+        {Value(pair % 8), Value(0u), Value(0u), Value(0u)}, pc);
+    fixture.Emit(ValueOpcode::ImageSampleRaw,
+                 {image, sampler, address, Value(true)},
+                 fixture.AddMemory(memory, pc));
+  }
+  fixture.PlanAndTrack();
+
+  Check(fixture.program.info.images.size() == 9 &&
+            fixture.program.info.samplers.size() == 8 &&
+            fixture.program.info.sampled_pairs.size() == 72,
+        "distinct image/sampler combinations were limited or duplicated");
+  for (uint32_t index = 0; index < 72; ++index) {
+    const auto &pair = fixture.program.info.sampled_pairs[index];
+    Check(pair.image == index / 8 && pair.sampler == index % 8 &&
+              pair.first_use_pc == index * 4,
+          "sampled pair lost its independent resources or first use");
+  }
+}
+
 void TestSampleAdjustSamplerScratch() {
   Fixture fixture(ShaderType::Pixel);
   const auto active = fixture.Emit(
@@ -8255,6 +8287,7 @@ int main() {
     Run("scalar/vector alias", TestScalarAndVectorBufferAlias);
     Run("runtime unsigned min", TestRuntimeUnsignedMinDescriptor);
     Run("images and samplers", TestImagesSamplersAndAliases);
+    Run("independent image/sampler pairs", TestIndependentImageSamplerPairs);
     Run("SampleAdjust sampler scratch", TestSampleAdjustSamplerScratch);
     Run("FMASK load specialization", TestFmaskLoadSpecialization);
     Run("gather LOD sampler validation", TestGatherLodSamplerValidation);