/*

     File: OpenGLRenderer.h

 Abstract: The renderer class creates and draws the OpenGL shaders. This is where we set up instancing and draw the set of gears with one single instancing draw call.

  Version: 1.1

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#import <OpenGL/OpenGL.h>

#import <OpenGL/gl3.h>

#import <OpenGL/glext.h>

#import <OpenGL/glu.h>

#import <GLKit/GLKMath.h>

#include <stdint.h>

#include <stdio.h>

typedef struct _QuadricStruct

{

    GLuint vertCount;

    GLuint indexCount;

    GLuint vertsID;

    GLuint normalsID;

    GLuint colorsID;

    GLuint indicesID;

} quadric;

const uint32_t kShaderCount = 2;

const uint32_t kProgramCount = 1;

@interface OpenGLRenderer : NSObject

{

    GLsizei width, height;

    GLint shaders[kShaderCount];

    GLint programs[kProgramCount];

    // attributes

    GLint attribPosition, attribColor, attribNormal, attribScale,

        attribOrientationMatrix0, attribOrientationMatrix1, attribOrientationMatrix2, attribOrientationMatrix3,

        lightPosLocation, lightColorLocation;

    // uniforms

    GLuint rotationAnimationMatrixLocation, cameraTransformLocation, projectionMatrixLocation;

    // buffer objects

    GLuint scaleBufferID,orientationMatID;

    GLuint gearVAOId;

    quadric* triToothedGearFlat;

    GLKMatrix4 cameraMatrix;

    GLKVector4 lightPos, lightColor;

    int numGears;

    float animationDelta;

    uint32_t kAnimationLoopValue, animationStep;

    BOOL animate;

    float xAxisAngle, zAxisAngle;

}

- (void)draw;

- (void)toggleAnimation;

- (BOOL)setupGL;

- (void)reshapeToWidth:(GLsizei)w height:(GLsizei)h;

- (void)applyCameraMovementWdx:(float)dx dy:(float)dy;

@end