Merge pull request #2118 from FernandoS27/ipa-improve

shader_decompiler: Improve Accuracy of Attribute Interpolation.

2 files changed, 14 insertions, 3 deletions

diff --git a/src/video_core/shader/decode/memory.cpp b/src/video_core/shader/decode/memory.cpp
index 55ec601ff..38f01ca50 100644
--- a/src/video_core/shader/decode/memory.cpp
+++ b/src/video_core/shader/decode/memory.cpp
@@ -48,7 +48,7 @@ u32 ShaderIR::DecodeMemory(NodeBlock& bb, u32 pc) {
         UNIMPLEMENTED_IF_MSG((instr.attribute.fmt20.immediate.Value() % sizeof(u32)) != 0,
                              "Unaligned attribute loads are not supported");
 
-        Tegra::Shader::IpaMode input_mode{Tegra::Shader::IpaInterpMode::Perspective,
+        Tegra::Shader::IpaMode input_mode{Tegra::Shader::IpaInterpMode::Pass,
                                           Tegra::Shader::IpaSampleMode::Default};
 
         u64 next_element = instr.attribute.fmt20.element;
diff --git a/src/video_core/shader/decode/other.cpp b/src/video_core/shader/decode/other.cpp
index f9502e3d0..d750a2936 100644
--- a/src/video_core/shader/decode/other.cpp
+++ b/src/video_core/shader/decode/other.cpp
@@ -135,7 +135,18 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
                                                 instr.ipa.sample_mode.Value()};
 
         const Node attr = GetInputAttribute(attribute.index, attribute.element, input_mode);
-        const Node value = GetSaturatedFloat(attr, instr.ipa.saturate);
+        Node value = attr;
+        const Tegra::Shader::Attribute::Index index = attribute.index.Value();
+        if (index >= Tegra::Shader::Attribute::Index::Attribute_0 &&
+            index <= Tegra::Shader::Attribute::Index::Attribute_31) {
+            // TODO(Blinkhawk): There are cases where a perspective attribute use PASS.
+            // In theory by setting them as perspective, OpenGL does the perspective correction.
+            // A way must figured to reverse the last step of it.
+            if (input_mode.interpolation_mode == Tegra::Shader::IpaInterpMode::Multiply) {
+                value = Operation(OperationCode::FMul, PRECISE, value, GetRegister(instr.gpr20));
+            }
+        }
+        value = GetSaturatedFloat(value, instr.ipa.saturate);
 
         SetRegister(bb, instr.gpr0, value);
         break;
@@ -175,4 +186,4 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
     return pc;
 }
 
-} // namespace VideoCommon::Shader
\ No newline at end of file
+} // namespace VideoCommon::Shader