Ios OpenGL UIView仅显示黑色
我正在学习OpenGLES2.0教程,我试图让屏幕清晰到glClearColor,但我看到的只是黑色。看看我的观点,你能明白为什么吗Ios OpenGL UIView仅显示黑色,ios,uiview,opengl-es,Ios,Uiview,Opengl Es,我正在学习OpenGLES2.0教程,我试图让屏幕清晰到glClearColor,但我看到的只是黑色。看看我的观点,你能明白为什么吗 #import "GLView.h" @implementation GLView + (Class)layerClass { return [CAEAGLLayer class]; } - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if
#import "GLView.h"
@implementation GLView
+ (Class)layerClass
{
return [CAEAGLLayer class];
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
[self setupLayer];
[self setupContext];
[self setupRenderBuffer];
[self setupFrameBuffer];
[self render];
}
return self;
}
- (void)setupLayer
{
m_eaglLayer = (CAEAGLLayer *)self.layer;
m_eaglLayer.opaque = YES;
}
- (void)setupContext
{
m_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
if (!m_context) {
NSLog(@"Failed to initialize OpenGLES 2.0 context");
exit(1);
}
if (![EAGLContext setCurrentContext:m_context]) {
NSLog(@"Failed to set current OpenGL context");
exit(1);
}
}
- (void)setupRenderBuffer
{
glGenRenderbuffers(1, &m_colorRenderBuffer);
glBindRenderbuffer(GL_RENDERBUFFER, m_colorRenderBuffer);
[m_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:m_eaglLayer];
}
- (void)setupFrameBuffer
{
GLuint framebuffer;
glGenFramebuffers(1, &framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, m_colorRenderBuffer);
}
-(void)render
{
glClearColor(0, 104.0/255.0, 55.0/255.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glViewport(0, 0, self.frame.size.width, self.frame.size.height);
[m_context presentRenderbuffer:GL_RENDERBUFFER];
}
@end
我发现了问题。我从未在应用程序委托中初始化UIWindow。请尝试在清除之前调用glViewport。另外,在设置两个缓冲区后,请检查帧缓冲区状态。更好的是,除非您使用需要您管理自己的帧缓冲区的高级(通常是多次)渲染技术,否则请使用,这样您就不必担心帧缓冲区设置问题。(如果您喜欢RW教程,请尝试。)首先调用glViewport不起作用。我计划使用GLKView,我只是想知道为什么它不起作用。除了着色器和顶点数据之外,它与工作的原始项目几乎完全相同。