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| @implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//1.OpenGL ES 相关初始化
[self setUpConfig];
//2.加载顶点/纹理坐标数据
[self setUpVertexData];
//3.加载纹理数据(使用GLBaseEffect)
[self setUpTexture];
}
static float rod = 0.1;
- (IBAction)left:(id)sender {
// GLKMatrix4 mat = GLKMatrix4RotateX(cEffect.transform.modelviewMatrix, 0.08);
// mat = GLKMatrix4RotateZ(mat, 0.05);
// cEffect.transform.modelviewMatrix = mat;
// [((GLKView *)self.view) display];
}
#pragma mark -- OpenGL ES setUp
-(void)setUpTexture
{
//1.获取纹理图片路径
NSString *filePath = [[NSBundle mainBundle]pathForResource:@"kunkun" ofType:@"jpg"];
NSString *file2Path = [[NSBundle mainBundle]pathForResource:@"1" ofType:@"jpg"];
//2.设置纹理参数
//纹理坐标原点是左下角,但是图片显示原点应该是左上角.
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:@(1),GLKTextureLoaderOriginBottomLeft, nil];
GLKTextureInfo *textureInfo = [GLKTextureLoader textureWithContentsOfFile:filePath options:options error:nil];
GLKTextureInfo *texture2Info = [GLKTextureLoader textureWithContentsOfFile:file2Path options:options error:nil];
//3.使用苹果GLKit 提供GLKBaseEffect 完成着色器工作(顶点/片元)
cEffect = [[GLKBaseEffect alloc]init];
cEffect.texture2d0.enabled = GL_TRUE;
cEffect.texture2d0.name = texture2Info.name;
cEffect.texture2d1.enabled = GL_TRUE;
cEffect.texture2d1.name = textureInfo.name;
}
-(void)setUpVertexData
{
//1.设置顶点数组(顶点坐标,纹理坐标)
GLfloat vertexData[] = {
// 后面的
0.5, -0.5, 0.5f, 1.0f, 0.0f, //右下
0.5, 0.5, 0.5f, 1.0f, 1.0f, //右上
-0.5, 0.5, 0.5f, 0.0f, 1.0f, //左上
0.5, -0.5, 0.5f, 1.0f, 0.0f, //右下
-0.5, 0.5, 0.5f, 0.0f, 1.0f, //左上
-0.5, -0.5, 0.5f, 0.0f, 0.0f, //左下
// 前面的
0.5, -0.5, -0.5f, 1.0f, 0.0f, //右下
0.5, 0.5, -0.5f, 1.0f, 1.0f, //右上
-0.5, 0.5, -0.5f, 0.0f, 1.0f, //左上
0.5, -0.5, -0.5f, 1.0f, 0.0f, //右下
-0.5, 0.5, -0.5f, 0.0f, 1.0f, //左上
-0.5, -0.5, -0.5f, 0.0f, 0.0f, //左下
// 左边的
0.5, -0.5, 0.5f, 1.0f, 0.0f, //右下
0.5, 0.5, 0.5f, 1.0f, 1.0f, //右上
0.5, 0.5, -0.5f, 0.0f, 1.0f, //左上
0.5, -0.5, 0.5f, 1.0f, 0.0f, //右下
0.5, 0.5, -0.5f, 0.0f, 1.0f, //左上
0.5, -0.5, -0.5f, 0.0f, 0.0f, //左下
// 右边的
-0.5, -0.5, 0.5f, 1.0f, 0.0f, //右下
-0.5, 0.5, 0.5f, 1.0f, 1.0f, //右上
-0.5, 0.5, -0.5f, 0.0f, 1.0f, //左上
-0.5, -0.5, 0.5f, 1.0f, 0.0f, //右下
-0.5, 0.5, -0.5f, 0.0f, 1.0f, //左上
-0.5, -0.5, -0.5f, 0.0f, 0.0f, //左下
};
//2.开辟顶点缓存区
//(1).创建顶点缓存区标识符ID
GLuint bufferID;
glGenBuffers(1, &bufferID);
//(2).绑定顶点缓存区.(明确作用)
glBindBuffer(GL_ARRAY_BUFFER, bufferID);
//(3).将顶点数组的数据copy到顶点缓存区中(GPU显存中)
glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), vertexData, GL_STATIC_DRAW);
//3.打开读取通道.
//顶点坐标数据
glEnableVertexAttribArray(GLKVertexAttribPosition);
glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 5, (GLfloat *)NULL + 0);
//纹理坐标数据
glEnableVertexAttribArray(GLKVertexAttribTexCoord0);
glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 5, (GLfloat *)NULL + 3);
}
-(void)setUpConfig
{
//1.初始化上下文&设置当前上下文
context = [[EAGLContext alloc]initWithAPI:kEAGLRenderingAPIOpenGLES3];
//判断context是否创建成功
if (!context) {
NSLog(@"Create ES context Failed");
}
//设置当前上下文
[EAGLContext setCurrentContext:context];
//2.获取GLKView & 设置context
GLKView *view =(GLKView *) self.view;
view.context = context;
//3.配置视图创建的渲染缓存区.
view.drawableColorFormat = GLKViewDrawableColorFormatRGBA8888;
view.drawableDepthFormat = GLKViewDrawableDepthFormat16;
//4.设置背景颜色
glClearColor(1, 0, 0, 1.0);
}
#pragma mark -- GLKViewDelegate
//绘制视图的内容
- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
{
glEnable(GL_DEPTH_TEST);
//1.
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
rod = rod + 0.001;
GLKMatrix4 mat = GLKMatrix4RotateY(cEffect.transform.modelviewMatrix, 0.05);
mat = GLKMatrix4RotateX(mat, 0.05);
cEffect.transform.modelviewMatrix = mat;
//2.准备绘制
[cEffect prepareToDraw];
//3.开始绘制
glDrawArrays(GL_TRIANGLES, 0, 6 * 4);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
|
