DrawCommand.h

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#ifndef GlobeEngine_DrawCommand_h
#define GlobeEngine_DrawCommand_h

#include "OpenGL_Includes.h"

namespace ge {
    typedef struct {
        GLuint count;
        GLuint instanceCount;
        GLuint firstIndex;
        GLuint baseVertex;
        GLuint baseInstance;
    } DrawElementsIndirectCommand;

    typedef struct {
        GLuint  count;
        GLuint  instanceCount;
        GLuint  first;
        GLuint  baseInstance;
    } DrawArraysIndirectCommand;
    
    class DrawArraysCommand
    {
    public:
        DrawArraysCommand(GLenum _mode, GLint _first, GLsizei _count) {
            mode = _mode;
            count = _count;
            first = _first;
        };

        void draw() {
            glDrawArrays(mode, first, count);
        }

    protected:
        GLenum mode;
        GLsizei count;
        GLint first;
    };

    class DrawArraysInstancedCommand : public DrawArraysCommand
    {
    public:
        DrawArraysInstancedCommand(GLenum _mode, GLint _first, GLsizei _count, GLsizei _instanceCount) : DrawArraysCommand(_mode, _first,_count) {
            this->instanceCount = _instanceCount;
        };

        void draw() {
            glDrawArraysInstanced(this->mode, this->first, this->count, this->instanceCount);
        }

    private:
        GLsizei instanceCount;
    };
    
    template <int TYPE> class DrawElementsCommand
    {
    public:
        DrawElementsCommand(GLenum _mode, GLsizei _count, const GLvoid * _indices) {
            mode = _mode;
            count = _count;
            indices = _indices;
        };

        void draw() {
            glDrawElements(mode, count, TYPE, indices);
        }
        
    protected:
        GLenum mode;
        GLsizei count;
        const GLvoid* indices;
    };
    
    template <int TYPE> class DrawElementsInstancedCommand : public DrawElementsCommand<TYPE>
    {
    public:
        DrawElementsInstancedCommand(GLenum _mode, GLsizei _count, const GLvoid * _indices, GLsizei _instanceCount ) : DrawElementsCommand<TYPE>(_mode, _count, _indices) {
            this->instanceCount = _instanceCount;
        };
        
        void draw() {
            glDrawElementsInstanced(this->mode, this->count, TYPE, this->indices,this->instanceCount);
        }
        
    private:
        GLsizei instanceCount;
    };
    
    typedef DrawElementsCommand<GL_UNSIGNED_INT> DrawElementsCommandUInt;
    typedef DrawElementsCommand<GL_UNSIGNED_SHORT> DrawElementsCommandUShort;
    
    typedef DrawElementsInstancedCommand<GL_UNSIGNED_INT> DrawElementsInstancedCommandUInt;
    typedef DrawElementsInstancedCommand<GL_UNSIGNED_SHORT> DrawElementsInstancedCommandUShort;
    
}
#endif