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问题是我在着色器中传递了两个纹理,但三维模型上的图片对于两个sampler2D变量(第一个图像为“normal.jpg”)是相同的。我会非常感激的帮助。下面是代码:在着色器中传递纹理
GLuint _textures[2];
glEnable(GL_TEXTURE_2D);
glGenTextures(2, _textures);
glActiveTexture(GL_TEXTURE0);
bump = [self loadTextureWithName: @"normal.jpg"];
//bump = [self loadTextureWithName: @"specular.jpg"];
glUniform1i(bump, 0);
glActiveTexture(GL_TEXTURE1);
diffuse = [self loadTextureWithName2: @"diffuse.jpg"];
glUniform1i(diffuse, 0);
- (GLuint) loadTextureWithName: (NSString*) filename{
CGImageRef textureImage = [UIImage imageNamed: filename].CGImage;
NSInteger texWidth = CGImageGetWidth(textureImage);
NSInteger texHeight = CGImageGetHeight(textureImage);
GLubyte *textureData = (GLubyte *)malloc(texWidth * texHeight * 4*sizeof(GLubyte));
memset((void*) textureData, 0, texWidth * texHeight * 4*sizeof(GLubyte));
CGContextRef textureContext = CGBitmapContextCreate(textureData,texWidth,texHeight,8, texWidth * 4,CGImageGetColorSpace(textureImage),kCGImageAlphaPremultipliedLast);
CGContextDrawImage(textureContext,CGRectMake(0.0, 0.0, (float)texWidth, (float)texHeight),textureImage);
CGContextRelease(textureContext);
//glActiveTexture(GL_TEXTURE0);
//glShadeModel(GL_FLAT);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
//glGenTextures(1, &TEX);
glBindTexture(GL_TEXTURE_2D, _textures[0]);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, textureData);
free(textureData);
//texId = [NSNumber numberWithInt:TEX];
//[textureImage release];//
//[textureContext release];//
return _textures[0];
}
- (GLuint) loadTextureWithName2: (NSString*) filename{
CGImageRef textureImage = [UIImage imageNamed: filename].CGImage;
NSInteger texWidth = CGImageGetWidth(textureImage);
NSInteger texHeight = CGImageGetHeight(textureImage);
GLubyte *textureData = (GLubyte *)malloc(texWidth * texHeight * 4*sizeof(GLubyte));
memset((void*) textureData, 0, texWidth * texHeight * 4*sizeof(GLubyte));
CGContextRef textureContext = CGBitmapContextCreate(textureData,texWidth,texHeight,8, texWidth * 4, CGImageGetColorSpace(textureImage),kCGImageAlphaPremultipliedLast);
CGContextDrawImage(textureContext,CGRectMake(0.0, 0.0, (float)texWidth, (float)texHeight),textureImage);
CGContextRelease(textureContext);
//glActiveTexture(GL_TEXTURE1);
//glShadeModel(GL_FLAT);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
//glGenTextures(1, &TEX);
glBindTexture(GL_TEXTURE_2D, _textures[1]);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texWidth, texHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, textureData);
free(textureData);
return _textures[1];
}