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POsame texture binding on every "quad"
 

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  1. POsame texture binding on every "quad"
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    <p>I have 6 squares made up of 2 trangles, each of which is supposed to have a different texture mapped onto it. Instead, each texture is having the last binded texture on it instead of its own. Heres my drawView and setView:</p> <pre><code>- (void)drawView:(GLView*)view { glBindTexture(GL_TEXTURE_2D, texture[0]); glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); static const Vertex3D vertices[] = { {0,0, 1}, //TL { 1024,0, 1}, //TR {0,-1024, 1}, //BL { 1024.0f, -1024.0f, 1} //BR }; static const GLfloat texCoords[] = { 0.0, 1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 0.0 }; glVertexPointer(3, GL_FLOAT, 0, vertices); glTexCoordPointer(2, GL_FLOAT, 0, texCoords); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_TEXTURE_COORD_ARRAY); } - (void)setupView:(GLView*)view { // Bind the number of textures we need. glGenTextures(1, &amp;texture[0]); glBindTexture(GL_TEXTURE_2D, texture[0]); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_GENERATE_MIPMAP,GL_TRUE); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glLoadIdentity(); NSString *path = [[NSBundle mainBundle] pathForResource:filename ofType:@"jpg"]; NSData *texData = [[NSData alloc] initWithContentsOfFile:path]; UIImage *image = [[UIImage alloc] initWithData:texData]; if (image == nil) NSLog(@"Do real error checking here"); GLuint width = CGImageGetWidth(image.CGImage); GLuint height = CGImageGetHeight(image.CGImage); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); void *imageData = malloc( height * width * 4 ); CGContextRef context = CGBitmapContextCreate( imageData, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big ); // Flip the Y-axis CGContextTranslateCTM (context, 0, height); CGContextScaleCTM (context, 1.0, -1.0); CGColorSpaceRelease( colorSpace ); CGContextClearRect( context, CGRectMake( 0, 0, width, height ) ); CGContextDrawImage( context, CGRectMake( 0, 0, width, height ), image.CGImage ); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, imageData); CGContextRelease(context); free(imageData); } </code></pre>
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    1. COI can't see anything obviously wrong with that; can you log the values stored to texture[0] by glGenTextures, as a diagnostic step?
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    2. CONSLog(@"texture[0] = %d",texture[0]); yields 0 each time
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    3. COWell that's obviously an issue. I don't see how `glTexImage2D` can function at all without a working context so are you sure by some route you're not inadvertently getting to `glDeleteTextures` — or possibly you've got some sort of threading issue, especially re: the necesssary `glFlush`es stipulated by the documentation for `EAGLSharegroup`?
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