src/objectrenderer.h

   1 /**
   2  * @file objectrenderer.h
   3  * @brief Definition of ObjectRenderer class
   4  */
   5
   6 #include "ipdf.h"
   7 #include "graphicsbuffer.h"
   8 #include "shaderprogram.h"
   9 #include "bufferbuilder.h"
  10
  11 namespace IPDF
  12 {
  13         /**
  14          * Abstract Base class representing how a particular type of object will be rendered
  15          * Includes GPU rendering and CPU rendering
  16          * For GPU rendering, pass GLSL shader source files to constructor in the constructor of a base class
  17          *      To leave unimplemented, just pass NULL filename strings
  18          * For CPU rendering, implement RenderUsingCPU in the base class
  19          *  To leave unimplemented, just call ObjectRenderer::RenderUsingCPU in the base class
  20          * The View class uses ObjectRenderer's; see view.h
  21          */
  22         class ObjectRenderer
  23         {
  24                 public:
  25                         /** Construct the ObjectRenderer **/
  26                         ObjectRenderer(const ObjectType & type, const char * vert_glsl_file, const char * frag_glsl_file, const char * geom_glsl_file = "");
  27                         virtual ~ObjectRenderer() {}
  28
  29                         /**
  30                          * Use the GPU to render the objects - GLSL shader approach
  31                          * This way is definitely faster, but subject to the GPU's limitations on precision
  32                          */
  33                         void RenderUsingGPU();
  34
  35                         /**
  36                          * Use the CPU to render the objects - "make a bitmap and convert it to a texture" approach
  37                          * This way is definitely slower, but gives us more control over the number representations than a GPU
  38                          */
  39                         virtual void RenderUsingCPU() = 0;
  40
  41
  42
  43                         const ObjectType m_type; /** Type of objects **/
  44                 private:
  45                         friend class View; //View is a friendly fellow in the world of IPDF
  46                         void PrepareBuffers(unsigned max_size);
  47                         void FinaliseBuffers();
  48                         void AddObjectToBuffers(unsigned index);
  49
  50
  51                         ShaderProgram m_shader_program; /** GLSL shaders for GPU **/
  52                         GraphicsBuffer m_ibo; /** Index Buffer Object for GPU rendering **/
  53                         std::vector<unsigned> m_indexes; /** Index vector for CPU rendering **/
  54                         BufferBuilder<uint32_t> * m_buffer_builder; /** A BufferBuilder is temporarily used when preparing the ibo and std::vector **/
  55         };
  56
  57         /** Renderer for filled rectangles **/
  58         class RectFilledRenderer : public ObjectRenderer
  59         {
  60                 public:
  61                         RectFilledRenderer() : ObjectRenderer(RECT_FILLED, "shaders/rect_vert.glsl", "shaders/rect_frag.glsl","shaders/rect_filled_geom.glsl") {}
  62                         virtual ~RectFilledRenderer() {}
  63                         virtual void RenderUsingCPU() {ObjectRenderer::RenderUsingCPU();} //TODO: Implement
  64         };
  65         /** Renderer for outlined rectangles **/
  66         class RectOutlineRenderer : public ObjectRenderer
  67         {
  68                 public:
  69                         RectOutlineRenderer() : ObjectRenderer(RECT_OUTLINE, "shaders/rect_vert.glsl", "shaders/rect_frag.glsl", "shaders/rect_outline_geom.glsl") {}
  70                         virtual ~RectOutlineRenderer() {}
  71                         virtual void RenderUsingCPU() {ObjectRenderer::RenderUsingCPU();} //TODO: Implement
  72         };
  73         /** Renderer for filled circles **/
  74         class CircleFilledRenderer : public ObjectRenderer
  75         {
  76                 public:
  77                         CircleFilledRenderer() : ObjectRenderer(CIRCLE_FILLED, "shaders/rect_vert.glsl", "shaders/circle_frag.glsl", "shaders/circle_filled_geom.glsl") {}
  78                         virtual ~CircleFilledRenderer() {}
  79                         virtual void RenderUsingCPU() {ObjectRenderer::RenderUsingCPU();} //TODO: Implement
  80         };
  81 }