2 * @file objectrenderer.h
3 * @brief Definition of ObjectRenderer class
6 #ifndef _OBJECT_RENDERER_H
7 #define _OBJECT_RENDERER_H
10 #include "graphicsbuffer.h"
11 #include "shaderprogram.h"
12 #include "bufferbuilder.h"
18 * Abstract Base class representing how a particular type of object will be rendered
19 * Includes GPU rendering and CPU rendering
20 * For GPU rendering, pass GLSL shader source files to constructor in the constructor of a base class
21 * To leave unimplemented, just pass NULL filename strings
22 * For CPU rendering, implement RenderUsingCPU in the base class
23 * To leave unimplemented, just call ObjectRenderer::RenderUsingCPU in the base class
24 * The View class uses ObjectRenderer's; see view.h
29 /** Construct the ObjectRenderer **/
30 ObjectRenderer(const ObjectType & type, const char * vert_glsl_file, const char * frag_glsl_file, const char * geom_glsl_file = "");
31 virtual ~ObjectRenderer() {}
34 * Use the GPU to render the objects - GLSL shader approach
35 * This way is definitely faster, but subject to the GPU's limitations on precision
37 void RenderUsingGPU();
40 * Use the CPU to render the objects - "make a bitmap and convert it to a texture" approach
41 * This way is definitely slower, but gives us more control over the number representations than a GPU
44 struct CPURenderTarget
50 struct CPURenderBounds
52 int x; int y; int w; int h;
53 CPURenderBounds(const Rect & bounds, const View & view, const CPURenderTarget & target);
56 static void SaveBMP(const CPURenderTarget & target, const char * filename);
59 virtual void RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target) = 0;
63 const ObjectType m_type; /** Type of objects **/
65 friend class View; //View is a friendly fellow in the world of IPDF
66 void PrepareBuffers(unsigned max_size);
67 void FinaliseBuffers();
68 void AddObjectToBuffers(unsigned index);
71 ShaderProgram m_shader_program; /** GLSL shaders for GPU **/
72 GraphicsBuffer m_ibo; /** Index Buffer Object for GPU rendering **/
73 std::vector<unsigned> m_indexes; /** Index vector for CPU rendering **/
74 BufferBuilder<uint32_t> * m_buffer_builder; /** A BufferBuilder is temporarily used when preparing the ibo and std::vector **/
77 /** Renderer for filled rectangles **/
78 class RectFilledRenderer : public ObjectRenderer
81 RectFilledRenderer() : ObjectRenderer(RECT_FILLED, "shaders/rect_vert.glsl", "shaders/rect_frag.glsl","shaders/rect_filled_geom.glsl") {}
82 virtual ~RectFilledRenderer() {}
83 virtual void RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target);
85 /** Renderer for outlined rectangles **/
86 class RectOutlineRenderer : public ObjectRenderer
89 RectOutlineRenderer() : ObjectRenderer(RECT_OUTLINE, "shaders/rect_vert.glsl", "shaders/rect_frag.glsl", "shaders/rect_outline_geom.glsl") {}
90 virtual ~RectOutlineRenderer() {}
91 virtual void RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target);
93 /** Renderer for filled circles **/
94 class CircleFilledRenderer : public ObjectRenderer
97 CircleFilledRenderer() : ObjectRenderer(CIRCLE_FILLED, "shaders/rect_vert.glsl", "shaders/circle_frag.glsl", "shaders/circle_filled_geom.glsl") {}
98 virtual ~CircleFilledRenderer() {}
99 virtual void RenderUsingCPU(const Objects & objects, const View & view, const CPURenderTarget & target);
103 #endif //_OBJECT_RENDERER_H