1 files changed, 199 insertions, 0 deletions
diff --git a/source/application/StarRenderer_opengl20.hpp b/source/application/StarRenderer_opengl20.hpp
new file mode 100644
index 0000000..0bdb73a
--- /dev/null
+++ b/source/application/StarRenderer_opengl20.hpp
@@ -0,0 +1,199 @@
+#ifndef STAR_RENDERER_OPENGL_HPP
+#define STAR_RENDERER_OPENGL_HPP
+
+#include "StarTextureAtlas.hpp"
+#include "StarRenderer.hpp"
+
+#include "GL/glew.h"
+
+namespace Star {
+
+STAR_CLASS(OpenGl20Renderer);
+
+// OpenGL 2.0 implementation of Renderer.  OpenGL context must be created and
+// active during construction, destruction, and all method calls.
+class OpenGl20Renderer : public Renderer {
+public:
+  OpenGl20Renderer();
+  ~OpenGl20Renderer();
+
+  String rendererId() const override;
+  Vec2U screenSize() const override;
+
+  void setEffectConfig(Json const& effectConfig) override;
+  void setEffectParameter(String const& parameterName, RenderEffectParameter const& parameter) override;
+  void setEffectTexture(String const& textureName, Image const& image) override;
+
+  void setScissorRect(Maybe<RectI> const& scissorRect) override;
+
+  TexturePtr createTexture(Image const& texture, TextureAddressing addressing, TextureFiltering filtering) override;
+  void setSizeLimitEnabled(bool enabled) override;
+  void setMultiTexturingEnabled(bool enabled) override;
+  TextureGroupPtr createTextureGroup(TextureGroupSize size, TextureFiltering filtering) override;
+  RenderBufferPtr createRenderBuffer() 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 GlRenderVertex {
+    Vec2F screenCoordinate;
+    Vec2F textureCoordinate;
+    float textureIndex;
+    Vec4B color;
+    float param1;
+  };
+
+  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;
+  };
+
+  struct EffectParameter {
+    GLint parameterUniform = -1;
+    VariantTypeIndex parameterType;
+    Maybe<RenderEffectParameter> parameterValue;
+  };
+
+  struct EffectTexture {
+    GLint textureUniform = -1;
+    unsigned textureUnit;
+    TextureAddressing textureAddressing = TextureAddressing::Clamp;
+    TextureFiltering textureFiltering = TextureFiltering::Linear;
+    GLint textureSizeUniform = -1;
+    RefPtr<GlLoneTexture> textureValue;
+  };
+
+  static void logGlErrorSummary(String prefix);
+  static void uploadTextureImage(PixelFormat pixelFormat, Vec2U size, uint8_t const* data);
+
+  static RefPtr<GlLoneTexture> createGlTexture(Image const& texture, TextureAddressing addressing, TextureFiltering filtering);
+
+  shared_ptr<GlRenderBuffer> createGlRenderBuffer();
+
+  void flushImmediatePrimitives();
+
+  void renderGlBuffer(GlRenderBuffer const& renderBuffer, Mat3F const& transformation);
+
+  Vec2U m_screenSize;
+
+  GLuint m_program = 0;
+
+  GLint m_positionAttribute = -1;
+  GLint m_texCoordAttribute = -1;
+  GLint m_texIndexAttribute = -1;
+  GLint m_colorAttribute = -1;
+  GLint m_param1Attribute = -1;
+
+  List<GLint> m_textureUniforms = {};
+  List<GLint> m_textureSizeUniforms = {};
+  GLint m_screenSizeUniform = -1;
+  GLint m_vertexTransformUniform = -1;
+
+  RefPtr<GlTexture> m_whiteTexture;
+
+  StringMap<EffectParameter> m_effectParameters;
+  StringMap<EffectTexture> m_effectTextures;
+  Maybe<RectI> m_scissorRect;
+
+  bool m_limitTextureGroupSize;
+  bool m_useMultiTexturing;
+  List<shared_ptr<GlTextureGroup>> m_liveTextureGroups;
+
+  List<RenderPrimitive> m_immediatePrimitives;
+  shared_ptr<GlRenderBuffer> m_immediateRenderBuffer;
+};
+
+}
+
+#endif