Merge pull request #2865 from wwylele/gs++

PICA: implemented geometry shader

1 files changed, 49 insertions, 0 deletions

diff --git a/src/video_core/geometry_pipeline.h b/src/video_core/geometry_pipeline.h
new file mode 100644
index 000000000..91fdd3192
--- /dev/null
+++ b/src/video_core/geometry_pipeline.h
@@ -0,0 +1,49 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "video_core/shader/shader.h"
+
+namespace Pica {
+
+struct State;
+
+class GeometryPipelineBackend;
+
+/// A pipeline receiving from vertex shader and sending to geometry shader and primitive assembler
+class GeometryPipeline {
+public:
+    explicit GeometryPipeline(State& state);
+    ~GeometryPipeline();
+
+    /// Sets the handler for receiving vertex outputs from vertex shader
+    void SetVertexHandler(Shader::VertexHandler vertex_handler);
+
+    /**
+     * Setup the geometry shader unit if it is in use
+     * @param shader_engine the shader engine for the geometry shader to run
+     */
+    void Setup(Shader::ShaderEngine* shader_engine);
+
+    /// Reconfigures the pipeline according to current register settings
+    void Reconfigure();
+
+    /// Checks if the pipeline needs a direct input from index buffer
+    bool NeedIndexInput() const;
+
+    /// Submits an index from index buffer. Call this only when NeedIndexInput returns true
+    void SubmitIndex(unsigned int val);
+
+    /// Submits vertex attributes output from vertex shader
+    void SubmitVertex(const Shader::AttributeBuffer& input);
+
+private:
+    Shader::VertexHandler vertex_handler;
+    Shader::ShaderEngine* shader_engine;
+    std::unique_ptr<GeometryPipelineBackend> backend;
+    State& state;
+};
+} // namespace Pica