From 8a8a0501590e83cbc598c7491fca0b767094466f Mon Sep 17 00:00:00 2001
From: Kae <80987908+Novaenia@users.noreply.github.com>
Date: Mon, 8 Apr 2024 14:22:22 +1000
Subject: 2 features: multi-sample anti-aliasing & Lua patches for images

---
 source/application/StarRenderer_opengl.hpp | 252 +++++++++++++++++++++++++++++
 1 file changed, 252 insertions(+)
 create mode 100644 source/application/StarRenderer_opengl.hpp

(limited to 'source/application/StarRenderer_opengl.hpp')

diff --git a/source/application/StarRenderer_opengl.hpp b/source/application/StarRenderer_opengl.hpp
new file mode 100644
index 0000000..563ac96
--- /dev/null
+++ b/source/application/StarRenderer_opengl.hpp
@@ -0,0 +1,252 @@
+#pragma once
+
+#include "StarTextureAtlas.hpp"
+#include "StarRenderer.hpp"
+
+#include "GL/glew.h"
+
+namespace Star {
+
+STAR_CLASS(OpenGlRenderer);
+
+constexpr size_t FrameBufferCount = 1;
+
+// OpenGL 2.0 implementation of Renderer.  OpenGL context must be created and
+// active during construction, destruction, and all method calls.
+class OpenGlRenderer : public Renderer {
+public:
+  OpenGlRenderer();
+  ~OpenGlRenderer();
+
+  String rendererId() const override;
+  Vec2U screenSize() const override;
+
+  void loadConfig(Json const& config) override;
+  void loadEffectConfig(String const& name, Json const& effectConfig, StringMap<String> const& shaders) override;
+
+  void setEffectParameter(String const& parameterName, RenderEffectParameter const& parameter) override;
+  void setEffectTexture(String const& textureName, ImageView const& image) override;
+
+  void setScissorRect(Maybe<RectI> const& scissorRect) override;
+
+  bool switchEffectConfig(String const& name) override;
+
+  TexturePtr createTexture(Image const& texture, TextureAddressing addressing, TextureFiltering filtering) override;
+  void setSizeLimitEnabled(bool enabled) override;
+  void setMultiTexturingEnabled(bool enabled) override;
+  void setMultiSampling(unsigned multiSampling) override;
+  TextureGroupPtr createTextureGroup(TextureGroupSize size, TextureFiltering filtering) override;
+  RenderBufferPtr createRenderBuffer() override;
+
+  List<RenderPrimitive>& immediatePrimitives() override;
+  void render(RenderPrimitive primitive) override;
+  void renderBuffer(RenderBufferPtr const& renderBuffer, Mat3F const& transformation) override;
+
+  void flush() override;
+
+  void setScreenSize(Vec2U screenSize);
+
+  void startFrame();
+  void finishFrame();
+
+private:
+  struct GlTextureAtlasSet : public TextureAtlasSet<GLuint> {
+  public:
+    GlTextureAtlasSet(unsigned atlasNumCells);
+
+    GLuint createAtlasTexture(Vec2U const& size, PixelFormat pixelFormat) override;
+    void destroyAtlasTexture(GLuint const& glTexture) override;
+    void copyAtlasPixels(GLuint const& glTexture, Vec2U const& bottomLeft, Image const& image) override;
+
+    TextureFiltering textureFiltering;
+  };
+
+  struct GlTextureGroup : enable_shared_from_this<GlTextureGroup>, public TextureGroup {
+    GlTextureGroup(unsigned atlasNumCells);
+    ~GlTextureGroup();
+
+    TextureFiltering filtering() const override;
+    TexturePtr create(Image const& texture) override;
+
+    GlTextureAtlasSet textureAtlasSet;
+  };
+
+  struct GlTexture : public Texture {
+    virtual GLuint glTextureId() const = 0;
+    virtual Vec2U glTextureSize() const = 0;
+    virtual Vec2U glTextureCoordinateOffset() const = 0;
+  };
+
+  struct GlGroupedTexture : public GlTexture {
+    ~GlGroupedTexture();
+
+    Vec2U size() const override;
+    TextureFiltering filtering() const override;
+    TextureAddressing addressing() const override;
+
+    GLuint glTextureId() const override;
+    Vec2U glTextureSize() const override;
+    Vec2U glTextureCoordinateOffset() const override;
+
+    void incrementBufferUseCount();
+    void decrementBufferUseCount();
+
+    unsigned bufferUseCount = 0;
+    shared_ptr<GlTextureGroup> parentGroup;
+    GlTextureAtlasSet::TextureHandle parentAtlasTexture = nullptr;
+  };
+
+  struct GlLoneTexture : public GlTexture {
+    ~GlLoneTexture();
+
+    Vec2U size() const override;
+    TextureFiltering filtering() const override;
+    TextureAddressing addressing() const override;
+
+    GLuint glTextureId() const override;
+    Vec2U glTextureSize() const override;
+    Vec2U glTextureCoordinateOffset() const override;
+
+    GLuint textureId = 0;
+    Vec2U textureSize;
+    TextureAddressing textureAddressing = TextureAddressing::Clamp;
+    TextureFiltering textureFiltering = TextureFiltering::Nearest;
+  };
+
+  struct GlPackedVertexData {
+    uint32_t textureIndex : 2;
+    uint32_t fullbright : 1;
+    uint32_t rX : 1;
+    uint32_t rY : 1;
+    uint32_t unused : 27;
+  };
+
+  struct GlRenderVertex {
+    Vec2F pos;
+    Vec2F uv;
+    Vec4B color;
+    union Packed {
+      uint32_t packed;
+      GlPackedVertexData vars;
+    } pack;
+  };
+
+  struct GlRenderBuffer : public RenderBuffer {
+    struct GlVertexBufferTexture {
+      GLuint texture;
+      Vec2U size;
+    };
+
+    struct GlVertexBuffer {
+      List<GlVertexBufferTexture> textures;
+      GLuint vertexBuffer = 0;
+      size_t vertexCount = 0;
+    };
+
+    ~GlRenderBuffer();
+
+    void set(List<RenderPrimitive>& primitives) override;
+
+    RefPtr<GlTexture> whiteTexture;
+    ByteArray accumulationBuffer;
+
+    HashSet<TexturePtr> usedTextures;
+    List<GlVertexBuffer> vertexBuffers;
+
+    bool useMultiTexturing{true};
+  };
+
+  struct EffectParameter {
+    GLint parameterUniform = -1;
+    VariantTypeIndex parameterType = 0;
+    Maybe<RenderEffectParameter> parameterValue;
+  };
+
+  struct EffectTexture {
+    GLint textureUniform = -1;
+    unsigned textureUnit = 0;
+    TextureAddressing textureAddressing = TextureAddressing::Clamp;
+    TextureFiltering textureFiltering = TextureFiltering::Linear;
+    GLint textureSizeUniform = -1;
+    RefPtr<GlLoneTexture> textureValue;
+  };
+  
+  struct GlFrameBuffer : RefCounter {
+    GLuint id = 0;
+    RefPtr<GlLoneTexture> texture;
+
+    Json config;
+    bool blitted = false;
+    unsigned multisample = 0;
+
+    GlFrameBuffer(Json const& config);
+    ~GlFrameBuffer();
+  };
+
+  class Effect {
+  public:
+    GLuint program = 0;
+    Json config;
+    StringMap<EffectParameter> parameters;
+    StringMap<EffectTexture> textures;
+
+    StringMap<GLuint> attributes;
+    StringMap<GLuint> uniforms;
+
+    GLuint getAttribute(String const& name);
+    GLuint getUniform(String const& name);
+  };
+
+  static bool logGlErrorSummary(String prefix);
+  static void uploadTextureImage(PixelFormat pixelFormat, Vec2U size, uint8_t const* data);
+
+  
+  static RefPtr<GlLoneTexture> createGlTexture(ImageView const& image, TextureAddressing addressing, TextureFiltering filtering);
+
+  shared_ptr<GlRenderBuffer> createGlRenderBuffer();
+
+  void flushImmediatePrimitives();
+
+  void renderGlBuffer(GlRenderBuffer const& renderBuffer, Mat3F const& transformation);
+
+  void setupGlUniforms(Effect& effect);
+
+  RefPtr<OpenGlRenderer::GlFrameBuffer> getGlFrameBuffer(String const& id);
+  void blitGlFrameBuffer(RefPtr<OpenGlRenderer::GlFrameBuffer> const& frameBuffer);
+  void switchGlFrameBuffer(RefPtr<OpenGlRenderer::GlFrameBuffer> const& frameBuffer);
+
+  Vec2U m_screenSize;
+
+  GLuint m_program = 0;
+
+  GLint m_positionAttribute = -1;
+  GLint m_colorAttribute = -1;
+  GLint m_texCoordAttribute = -1;
+  GLint m_dataAttribute = -1;
+  List<GLint> m_textureUniforms = {};
+  List<GLint> m_textureSizeUniforms = {};
+  GLint m_screenSizeUniform = -1;
+  GLint m_vertexTransformUniform = -1;
+
+  Json m_config;
+
+  StringMap<Effect> m_effects;
+  Effect* m_currentEffect;
+
+  StringMap<RefPtr<GlFrameBuffer>> m_frameBuffers;
+  RefPtr<GlFrameBuffer> m_currentFrameBuffer;
+
+  RefPtr<GlTexture> m_whiteTexture;
+
+  Maybe<RectI> m_scissorRect;
+
+  bool m_limitTextureGroupSize;
+  bool m_useMultiTexturing;
+  unsigned m_multiSampling; // if non-zero, is enabled and acts as sample count
+  List<shared_ptr<GlTextureGroup>> m_liveTextureGroups;
+
+  List<RenderPrimitive> m_immediatePrimitives;
+  shared_ptr<GlRenderBuffer> m_immediateRenderBuffer;
+};
+
+}
-- 
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