GPU: Implemented the logic op functionality of the GPU.

This will ASSERT if blending is enabled at the same time as logic ops.

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -449,6 +449,7 @@ void RasterizerOpenGL::DrawArrays() {
 
     SyncDepthTestState();
     SyncBlendState();
+    SyncLogicOpState();
     SyncCullMode();
 
     // TODO(bunnei): Sync framebuffer_scale uniform here
@@ -847,6 +848,9 @@ void RasterizerOpenGL::SyncBlendState() {
     if (!state.blend.enabled)
         return;
 
+    ASSERT_MSG(regs.logic_op.enable == 0,
+               "Blending and logic op can't be enabled at the same time.");
+
     ASSERT_MSG(regs.independent_blend_enable == 1, "Only independent blending is implemented");
     ASSERT_MSG(!regs.independent_blend[0].separate_alpha, "Unimplemented");
     state.blend.rgb_equation = MaxwellToGL::BlendEquation(regs.independent_blend[0].equation_rgb);
@@ -856,3 +860,17 @@ void RasterizerOpenGL::SyncBlendState() {
     state.blend.src_a_func = MaxwellToGL::BlendFunc(regs.independent_blend[0].factor_source_a);
     state.blend.dst_a_func = MaxwellToGL::BlendFunc(regs.independent_blend[0].factor_dest_a);
 }
+
+void RasterizerOpenGL::SyncLogicOpState() {
+    const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs;
+
+    // TODO(Subv): Support more than just render target 0.
+    state.logic_op.enabled = regs.logic_op.enable != 0;
+
+    if (!state.logic_op.enabled)
+        return;
+
+    ASSERT_MSG(regs.blend.enable == 0, "Blending and logic op can't be enabled at the same time.");
+
+    state.logic_op.operation = MaxwellToGL::LogicOp(regs.logic_op.operation);
+}

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -141,6 +141,9 @@ private:
     /// Syncs the blend state to match the guest state
     void SyncBlendState();
 
+    /// Syncs the LogicOp state to match the guest state
+    void SyncLogicOpState();
+
     bool has_ARB_direct_state_access = false;
     bool has_ARB_separate_shader_objects = false;
     bool has_ARB_vertex_attrib_binding = false;

src/video_core/renderer_opengl/maxwell_to_gl.h

@@ -317,4 +317,44 @@ inline GLenum CullFace(Maxwell::Cull::CullFace cull_face) {
     return {};
 }
 
+inline GLenum LogicOp(Maxwell::LogicOperation operation) {
+    switch (operation) {
+    case Maxwell::LogicOperation::Clear:
+        return GL_CLEAR;
+    case Maxwell::LogicOperation::And:
+        return GL_AND;
+    case Maxwell::LogicOperation::AndReverse:
+        return GL_AND_REVERSE;
+    case Maxwell::LogicOperation::Copy:
+        return GL_COPY;
+    case Maxwell::LogicOperation::AndInverted:
+        return GL_AND_INVERTED;
+    case Maxwell::LogicOperation::NoOp:
+        return GL_NOOP;
+    case Maxwell::LogicOperation::Xor:
+        return GL_XOR;
+    case Maxwell::LogicOperation::Or:
+        return GL_OR;
+    case Maxwell::LogicOperation::Nor:
+        return GL_NOR;
+    case Maxwell::LogicOperation::Equiv:
+        return GL_EQUIV;
+    case Maxwell::LogicOperation::Invert:
+        return GL_INVERT;
+    case Maxwell::LogicOperation::OrReverse:
+        return GL_OR_REVERSE;
+    case Maxwell::LogicOperation::CopyInverted:
+        return GL_COPY_INVERTED;
+    case Maxwell::LogicOperation::OrInverted:
+        return GL_OR_INVERTED;
+    case Maxwell::LogicOperation::Nand:
+        return GL_NAND;
+    case Maxwell::LogicOperation::Set:
+        return GL_SET;
+    }
+    LOG_CRITICAL(Render_OpenGL, "Unimplemented logic operation={}", static_cast<u32>(operation));
+    UNREACHABLE();
+    return {};
+}
+
 } // namespace MaxwellToGL