GLKit – Blenderのモンキーをクルクル

BlenderのAdd – Mesh – Monkeyで作れるおさるさんをGLKitで表示してみる

(XcodeのiOS6 Simulatorで試しています。)

ポイント

・storyboardでルートのViewをGLKViewにしています。

・Blenderからobjでexport　

  (設定でtriangulate Faces と include Normalをチェックした)

・objは obj2opengl.pl を使って C headerファイルにコンバート

  参照：Heiko Behrens (http://www.HeikoBehrens.net)

サンプルコード

ViewController.h

#import <GLKit/GLKit.h>

@interface ViewController : GLKViewController

@end

ViewController.m

#import “ViewController.h”

#import “monkey.h”

@interface ViewController () {

    GLuint v;

    GLuint nv;

}

@property (strong, nonatomic) GLKBaseEffect *baseEffect;

@property (strong, nonatomic) GLKView *gv;

@end

@implementation ViewController

@synthesize baseEffect, gv;

– (void)viewDidLoad

{

    gv = (GLKView*)self.view;

    gv.drawableDepthFormat = GLKViewDrawableDepthFormat16;

    gv.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];

    [EAGLContext setCurrentContext:gv.context];

    

    [super viewDidLoad];

    

    self.baseEffect = [[GLKBaseEffect alloc] init];

    self.baseEffect.light0.enabled = GL_TRUE;

    self.baseEffect.light0.diffuseColor = GLKVector4Make(0.7f,0.7f,0.7f,1.0f);

    self.baseEffect.light0.position = GLKVector4Make(-0.8f,-0.8f,-1.0f,0.0f);

    self.baseEffect.light0.ambientColor = GLKVector4Make(0.2f, 0.2f, 0.2f, 1.0f);

    

    glClearColor(.5f, .5f, .5f, 1.0f);

    

    glGenBuffers(1, &v);

    glBindBuffer(GL_ARRAY_BUFFER, v);

    glBufferData(GL_ARRAY_BUFFER, sizeof(monkeyVerts), monkeyVerts, GL_STATIC_DRAW);

    glGenBuffers(1, &nv);

    glBindBuffer(GL_ARRAY_BUFFER, nv);

    glBufferData(GL_ARRAY_BUFFER, sizeof(monkeyNormals), monkeyNormals, GL_STATIC_DRAW);

    

    glEnable(GL_DEPTH_TEST);

}

– (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch *t = [touches anyObject];

    CGPoint p = [t locationInView:self.view];

    

    GLKMatrix4 modelViewMatrix = GLKMatrix4MakeRotation(GLKMathDegreesToRadians(p.x), 0.0f, 0.0f, 1.0f);

    

    modelViewMatrix = GLKMatrix4Rotate(modelViewMatrix,GLKMathDegreesToRadians(p.y), 0.0f, 1.0f, 0.0f);

    self.baseEffect.transform.modelviewMatrix = modelViewMatrix;

}

– (void)glkView:(GLKView *)view drawInRect:(CGRect)rect

{

    [self.baseEffect prepareToDraw];

    

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    

    glBindBuffer(GL_ARRAY_BUFFER, v);

    glEnableVertexAttribArray(GLKVertexAttribPosition);

    glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), NULL + 0);

    

    glBindBuffer(GL_ARRAY_BUFFER, nv);

    glEnableVertexAttribArray(GLKVertexAttribNormal);

    glVertexAttribPointer(GLKVertexAttribNormal, 3, GL_FLOAT, GL_FALSE, 3* sizeof(GLfloat), NULL + 0);

    

    const GLfloat  aspectRatio = (GLfloat)view.drawableWidth / (GLfloat)view.drawableHeight;

    self.baseEffect.transform.projectionMatrix = GLKMatrix4MakeScale(0.5f, 0.5 * aspectRatio, 0.5f);

    glDrawArrays(GL_TRIANGLES, 0, monkeyNumVerts);

}

– (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end