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这是一个非常奇怪的问题。我使用从苹果示例复制的方法创建纹理。它在苹果样本中工作正常,但不在矿山项目中。纹理不显示,只有glcolor4f定义的颜色。我用glistexture和glgeterror来检查,他们说没有错。这只发生在我第一次加载纹理。如果我释放纹理并重新加载,它可以使用相同的代码。有没有其他的方法来检查OpenGL的错误?OpenGL纹理没有显示(用可可)
这里是我使用加载纹理的代码:
- (FETexture *)loadTextureWithPath:(NSString*)name{
NSURL *url = nil;
CGImageSourceRef src;
CGImageRef image;
CGContextRef context = nil;
CGColorSpaceRef colorSpace;
GLuint textureId;
GLuint pboId;
GLubyte *data;
url = [NSURL fileURLWithPath: name];
src = CGImageSourceCreateWithURL((__bridge CFURLRef)url, NULL);
if (!src) {
NSLog(@"No image");
return nil;
}
image = CGImageSourceCreateImageAtIndex(src, 0, NULL);
CFRelease(src);
GLuint width = (GLint)CGImageGetWidth(image);
GLuint height = (GLint)CGImageGetHeight(image);
data = (GLubyte*) calloc(width * height * 4, sizeof(GLubyte));
colorSpace = CGColorSpaceCreateDeviceRGB();
context = CGBitmapContextCreate(data, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
CGColorSpaceRelease(colorSpace);
// Core Graphics referential is upside-down compared to OpenGL referential
// Flip the Core Graphics context here
// An alternative is to use flipped OpenGL texture coordinates when drawing textures
CGContextTranslateCTM(context, 0.0, height);
CGContextScaleCTM(context, 1.0, -1.0);
// Set the blend mode to copy before drawing since the previous contents of memory aren't used. This avoids unnecessary blending.
CGContextSetBlendMode(context, kCGBlendModeCopy);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
CGContextRelease(context);
CGImageRelease(image);
glGenTextures(1, &textureId);
glGenBuffers(1, &pboId);
// Bind the texture
glBindTexture(GL_TEXTURE_2D, textureId);
// Bind the PBO
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pboId);
// Upload the texture data to the PBO
glBufferData(GL_PIXEL_UNPACK_BUFFER, width * height * 4 * sizeof(GLubyte), data, GL_STATIC_DRAW);
// Setup texture parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
// OpenGL likes the GL_BGRA + GL_UNSIGNED_INT_8_8_8_8_REV combination
// Use offset instead of pointer to indictate that we want to use data copied from a PBO
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, 0);
// We can delete the application copy of the texture data now
free(data);
glBindTexture(GL_TEXTURE_2D, 0);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
FETexture *texture = [FETexture new];
texture.textureID = textureId;
texture.bufferID = pboId;
texture.width = width;
texture.height = height;
return texture;
真的非常感谢您的回答。我不显示绘制代码是因为数据架构非常复杂。但是当我加载和绘制时,我会打印纹理名称,它也是一样的。我已经删除了一堆代码,根本没有任何改变。今天,我把这个项目带到另一个mac,它的工作正常......为什么......好吧,我将使用调试工具来检查它是否是xcode或我的hacintosh问题。真的非常感谢您的帮助。 – user1904689 2013-04-24 02:02:43