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OpenGL 紋理初始化/渲染問題

[英]Problem with OpenGL Texture Initialisation/Rendering

 原文  2011-07-15 14:58:00  4   2    c/ cocoa/ opengl/ textures

問題描述

我嘗試使用 model class 渲染非 2 次冪紋理，該紋理創建紋理並存儲其 ID 和大小（感謝 ADC 和另一個 stackoverflow 成員），以及創建 VBO 並渲染它的附加代碼（VBO 和渲染的代碼用於測試目的，它在我的模型中正確划分）。

當我使用此代碼但刪除特定於紋理的代碼時，它可以正常工作。 然而，當添加紋理特定代碼時，它只渲染我認為是右下角的像素，從嘗試多個復雜圖像並使用 DigitalColor Meter 檢查圖像和 output。

我不認為在使用此設置時必須明確指定紋理坐標，如果他們這樣做，我會怎么做？

主要OpenGL代碼

    // Create vertex buffer
    GLuint memoryPointer = 0;
    GLuint colourMemoryPointer = 0;

    GLfloat *vertices;
    size_t vertex_size = 0;

    int check = AllocateVertexBuffer(2, 4, &vertices, &vertex_size);
    CDMeshVertexesCreateRectangle(200, 200, vertices);


    // Create colour buffer
    GLfloat *colors;
    size_t color_size;

    int check2 = AllocateVertexBuffer(4, 4, &colors, &color_size);
    CDMeshColorsCreateGrey(1.0, 4, colors);


    // Create texture buffer
    CDTexture *texture = [CDTexture loadPngTexture:@"Rawr"];

    // Allocate the buffer
    glGenBuffers(1, &memoryPointer);
    // Bind the buffer object (tell OpenGL what to use)
    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);

    // Allocate space for the VBO
    glBufferData(GL_ARRAY_BUFFER, vertex_size, vertices, GL_STATIC_DRAW);


    // Allocate the buffer
    glGenBuffers(1, &colourMemoryPointer);
    // Bind the buffer object (tell OpenGL what to use)
    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);

    // Allocate space for the VBO
    glBufferData(GL_ARRAY_BUFFER, color_size, colors, GL_STATIC_DRAW);

    glEnableClientState(GL_VERTEX_ARRAY); // Activate vertex coordinates array
    glEnableClientState(GL_COLOR_ARRAY);

    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);
    glVertexPointer(2, GL_FLOAT, 0, 0);   

    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);
    glColorPointer(4, GL_FLOAT, 0, 0);

    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture.ID);
    glTexCoordPointer(2, GL_FLOAT, 0, 0);

    //[texture render];

    //render
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    glDisableClientState(GL_VERTEX_ARRAY); // Deactivate vertex coordinates array
    glDisableClientState(GL_COLOR_ARRAY);

    free(vertices);
    free(colors);

CDTexture loadPngTexture: 方法

CFURLRef textureURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(),
                                              (CFStringRef)fileName,
                                              CFSTR("png"),
                                              NULL);

NSAssert(textureURL, @"Texture name invalid");

// Get the image source using a file path
CGImageSourceRef myImageSourceRef = CGImageSourceCreateWithURL(textureURL, NULL);
NSAssert(myImageSourceRef, @"Invalid Image Path.");
NSAssert((CGImageSourceGetCount(myImageSourceRef) > 0), @"No Image in Image Source.");

// Get the image reference using the source reference, -_-
CGImageRef myImageRef = CGImageSourceCreateImageAtIndex (myImageSourceRef, 0, NULL);
NSAssert(myImageSourceRef, @"Image not created.");

// Start gathering data from the image, before releasing it
GLuint myTextureName;
size_t width = CGImageGetWidth(myImageRef);
size_t height = CGImageGetHeight(myImageRef);
CGRect rect = {{0, 0}, {width, height}};
void * myData = calloc(width * 4, height);
CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
CGContextRef myBitmapContext = CGBitmapContextCreate (myData,
                                                      width, height, 8,
                                                      width*4, space,
                                                      kCGBitmapByteOrder32Host |
                                                      kCGImageAlphaPremultipliedFirst);

CGColorSpaceRelease(space);
// Flip so that it isn't upside-down
CGContextTranslateCTM(myBitmapContext, 0, height);
CGContextScaleCTM(myBitmapContext, 1.0f, -1.0f);
CGContextSetBlendMode(myBitmapContext, kCGBlendModeCopy);
CGContextDrawImage(myBitmapContext, rect, myImageRef);
CGContextRelease(myBitmapContext);

glEnable(GL_TEXTURE_RECTANGLE_ARB);

// Generate texture buffer
glGenTextures(1, &myTextureName);

// Bind buffer for use
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, myTextureName);

// Set storage methods
glPixelStorei(GL_UNPACK_ROW_LENGTH, width);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

// Set the parameter required for non power of two textures
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,
                GL_TEXTURE_MIN_FILTER, GL_LINEAR);

// Load the texture data into the buffer
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA8, width, height,
             0, GL_BGRA_EXT, GL_UNSIGNED_INT_8_8_8_8_REV, myData);

// Free the data used, as it's now in the buffer
free(myData);

// Return information on texture object
CDTexture *texture = [[CDTexture alloc] init];

texture.ID = myTextureName;
texture.size = NSMakeSize(width, height);

return texture;

更新
我嘗試使用紋理指針來定義區域，這會導致同樣的問題。 即使沒有綁定和使用指針，它繪制的顏色/紋理也會這樣做。 我還嘗試在使用和渲染之前和之后啟用和禁用 GL_TEXTURE_COORD_ARRAY，並導致相同的問題。

除非我做錯了什么，否則問題似乎與紋理指針無關。

GLfloat texCoords[8] = {
0.0, 0.0,
0.0, 1.0,
1.0, 1.0,
1.0, 0.0
};

...

glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);
glColorPointer(4, GL_FLOAT, 0, 0);

glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture.ID);
glTexCoordPointer(2, GL_FLOAT, 0, texCoords);

//[texture render];

//render
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

更新 2
我嘗試從 OpenGL 獲取錯誤代碼以嘗試解決問題，但未打印任何錯誤代碼。

更新 3
我嘗試使用不同的方法來獲取原始圖像數據，但結果相同（盡管有些變色，因為我不能使用正確的顏色設置）。 OpenGL對數據的解釋在這里肯定是有缺陷的。 我已經嘗試過 glPixelStorei() 但到目前為止沒有任何改變。 由於 OpenGL 沒有報告任何錯誤，它必須與程序解釋數據有關，所以要么是我為數據存儲方式設置的參數，要么是導致僅顯示 1 個像素的頂點問題，盡管因為這個精度，它最有可能是參數。

原始圖像數據的新流程（感謝另一個 stackoverflow 用戶）。 貼出來供參考。

 NSBitmapImageRep *theImage;
int bitsPPixel, bytesPRow;
NSSize size;
unsigned char *theImageData;

NSData* imgData = [NSData dataWithContentsOfFile:fileName options:NSUncachedRead error:nil];  // use FileURL

theImage = [NSBitmapImageRep imageRepWithData:imgData]; 


if( theImage != nil )
{
    bitsPPixel = [theImage bitsPerPixel];
    bytesPRow = [theImage bytesPerRow];
    size.width = [theImage pixelsWide];
    size.height = [theImage pixelsHigh];
}

enter code here

更新 4
更改為 GL_TEXTURE_2D 以提高效率。 左下角的像素仍然只被渲染。 這是代碼的完整順序：

// Create vertex buffer
    GLuint memoryPointer = 0;
    GLuint colourMemoryPointer = 0;

    GLfloat *vertices;
    size_t vertex_size = 0;

    AllocateVertexBuffer(2, 4, &vertices, &vertex_size);
    CDMeshVertexesCreateRectangle(200, 200, vertices);


    // Create colour buffer
    GLfloat *colors;
    size_t color_size;

    AllocateVertexBuffer(4, 4, &colors, &color_size);
    CDMeshColorsCreateGrey(1.0, 4, colors);

    // Create Texture UV Coordinates
    GLfloat *texture;
    size_t texture_size;
    AllocateVertexBuffer(4, 2, &texture, &texture_size);
    CDMeshVertexesCreateRectangle(1, 1, texture);

    // Create texture buffer
    NSString *fileName = @"Rawr3";

    CFURLRef textureURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(),
                                                  (CFStringRef)fileName,
                                                  CFSTR("png"),
                                                  NULL);

    NSAssert(textureURL, @"Texture name invalid");

    // Get the image source using a file path
    CGImageSourceRef myImageSourceRef = CGImageSourceCreateWithURL(textureURL, NULL);
    NSAssert(myImageSourceRef, @"Invalid Image Path.");
    NSAssert((CGImageSourceGetCount(myImageSourceRef) > 0), @"No Image in Image Source.");

    // Get the image reference using the source reference, -_-
    CGImageRef myImageRef = CGImageSourceCreateImageAtIndex (myImageSourceRef, 0, NULL);
    NSAssert(myImageSourceRef, @"Image not created.");

    // Start gathering data from the image, before releasing it
    GLuint myTextureName;
    size_t width = CGImageGetWidth(myImageRef);
    size_t height = CGImageGetHeight(myImageRef);
    CGRect rect = {{0, 0}, {width, height}};    //Doesnt need fiddling
    void * myData = calloc(width * 4, height); //Fiddled
    CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
    CGContextRef myBitmapContext = CGBitmapContextCreate (myData,
                                                          width, height, 8,
                                                          width*4, space,
                                                          kCGBitmapByteOrder32Host |
                                                          kCGImageAlphaPremultipliedFirst);

    CGColorSpaceRelease(space);
    // Flip so that it isn't upside-down
    CGContextTranslateCTM(myBitmapContext, 0, height);
    CGContextScaleCTM(myBitmapContext, 1.0f, -1.0f);
    CGContextSetBlendMode(myBitmapContext, kCGBlendModeCopy);
    CGContextDrawImage(myBitmapContext, rect, myImageRef);
    CGContextRelease(myBitmapContext);

    // Generate texture buffer
    glGenTextures(1, &myTextureName);

    // Bind buffer for use
    glBindTexture(GL_TEXTURE_2D, myTextureName);

    // Set storage methods
    glTexParameteri(GL_TEXTURE_2D,
                    GL_TEXTURE_STORAGE_HINT_APPLE,
                    GL_STORAGE_CACHED_APPLE);

    glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);

    // Set clamping and rendering preferences
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, 
                    GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 
                    GL_NEAREST);

    // Load the texture data into the buffer
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height,
                 0, GL_BGRA_EXT, GL_UNSIGNED_INT_8_8_8_8_REV, myData);

    glGetError();

    // Free the data used, as it's now in the buffer
    free(myData);

    // Return information on texture object
    CDTexture *textureObj = [[CDTexture alloc] init];

    textureObj.ID = myTextureName;
    textureObj.size = NSMakeSize(width, height);

    // Allocate the buffer
    glGenBuffers(1, &memoryPointer);
    // Bind the buffer object (tell OpenGL what to use)
    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);

    // Allocate space for the VBO
    glBufferData(GL_ARRAY_BUFFER, vertex_size, vertices, GL_STATIC_DRAW);


    // Allocate the buffer
    glGenBuffers(1, &colourMemoryPointer);
    // Bind the buffer object (tell OpenGL what to use)
    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);

    // Allocate space for the VBO
    glBufferData(GL_ARRAY_BUFFER, color_size, colors, GL_STATIC_DRAW);

    glEnableClientState(GL_VERTEX_ARRAY); // Activate vertex coordinates array
    glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glEnable(GL_TEXTURE_2D);

    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);
    glVertexPointer(2, GL_FLOAT, 0, 0);   

    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);
    glColorPointer(4, GL_FLOAT, 0, 0);

    glBindTexture(GL_TEXTURE_2D, textureObj.ID);
    glTexCoordPointer(2, GL_FLOAT, 0, texture);

    GetGLError();

    //render
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    glDisableClientState(GL_VERTEX_ARRAY); // Deactivate vertex coordinates array
    glDisableClientState(GL_COLOR_ARRAY);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    glDisable(GL_TEXTURE_2D);

    glDeleteBuffers(1, &memoryPointer);
    glDeleteBuffers(1, &colourMemoryPointer);
    GLuint texID = textureObj.ID;
    glDeleteBuffers(1, &texID);

    free(vertices);
    free(colors);
    free(texture);


}

更新 5從 glTexImage2D() 開始，即使我沒有綁定紋理並為其添加坐標，它也會渲染紋理的左下角像素，考慮到它應該使用 glTexCoordPointer() 繪制，這看起來很奇怪。

更新 6可能是最后一次更新，將紋理初始化代碼與另一種“手動”繪圖技術一起使用，效果很好。 我已經刪除了 Apple 特定的元素。 從這段代碼中刪除顏色 VBO 和指針時，由於某種奇怪的原因，仍然會呈現一個白框。 問題出在 VBO 上，但我不明白為什么。 GL_TEXTURE_RECTANGLE_ARB 現在只是用於我的彩色紋理，當這個問題解決后會改變。

// Create vertex buffer
    GLuint memoryPointer = 0;
    GLuint colourMemoryPointer = 0;

    GLfloat *vertices;
    size_t vertex_size = 0;

    AllocateVertexBuffer(2, 4, &vertices, &vertex_size);
    CDMeshVertexesCreateRectangle(200, 200, vertices);

    GetGLError();

    // Create colour buffer
    GLfloat *colors;
    size_t color_size;

    AllocateVertexBuffer(4, 4, &colors, &color_size);
    CDMeshColorsCreateGrey(0.4, 4, colors);

    // Allocate the buffer
    glGenBuffers(1, &memoryPointer);
    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);
    glBufferData(GL_ARRAY_BUFFER, vertex_size, vertices, GL_STATIC_DRAW);

    // Allocate the buffer
    glGenBuffers(1, &colourMemoryPointer);
    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);
    glBufferData(GL_ARRAY_BUFFER, color_size, colors, GL_STATIC_DRAW);

    // Enable client states for drawing the various arrays
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

    // Bind each buffer and use the VBO's to draw (apart from the texture buffer)
    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);
    glVertexPointer(2, GL_FLOAT, 0, 0);   

    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);
    glColorPointer(4, GL_FLOAT, 0, 0);

    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, myTextureName); //
    glTexCoordPointer(2, GL_FLOAT, 0, texture);

    //render
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    // Disale client states as were done with them.
    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_COLOR_ARRAY);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    glDisable(GL_TEXTURE_RECTANGLE_ARB);

    GetGLError();

    // Delete buffers to avoid problems
    glDeleteBuffers(1, &memoryPointer);
    glDeleteBuffers(1, &colourMemoryPointer);
    glDeleteBuffers(1, &myTextureName);

    free(vertices);
    free(colors);
    free(texture);

2 個解決方案

解決方案1
 1  2011-07-15 15:52:06

當然，您必須提供紋理坐標。 作為頂點屬性向量的一部分，或者通過生成它們（在着色器中）。 但是你必須以某種方式提供紋理坐標，你無法解決這個問題。

解決方案2
 0 已采納  2011-07-16 18:56:49

我（最終）通過為紋理創建頂點緩沖區 Object (VBO) 解決了這個問題，而不是嘗試將頂點數據直接提供給 glTextureCoordPointer()。 我想這里的教訓是，如果您要使用 VBO，請將它們用於所有內容，供參考：這是完整的代碼：

紋理創建

// Create texture buffer, start with the name of the image.
    NSString *fileName = @"Rawr";

    CFURLRef textureURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(),
                                                  (CFStringRef)fileName,
                                                  CFSTR("png"),
                                                  NULL);

    NSAssert(textureURL, @"Texture name invalid");

    // Get the image source using a file path
    CGImageSourceRef myImageSourceRef = CGImageSourceCreateWithURL(textureURL, NULL);
    NSAssert(myImageSourceRef, @"Invalid Image Path.");
    NSAssert((CGImageSourceGetCount(myImageSourceRef) > 0), @"No Image in Image Source.");

    // Get the image reference using the source reference, -_-
    CGImageRef myImageRef = CGImageSourceCreateImageAtIndex (myImageSourceRef, 0, NULL);
    NSAssert(myImageSourceRef, @"Image not created.");

    // Start gathering data from the image, before releasing it
    GLuint myTextureName;
    size_t width = CGImageGetWidth(myImageRef);
    size_t height = CGImageGetHeight(myImageRef);
    CGRect rect = {{0, 0}, {width, height}};    //Doesnt need fiddling
    void * myData = calloc(width * 4, height); //Fiddled
    CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
    CGContextRef myBitmapContext = CGBitmapContextCreate (myData,
                                                          width, height, 8,
                                                          width*4, space,
                                                          kCGBitmapByteOrder32Host |
                                                          kCGImageAlphaPremultipliedFirst);

    CGColorSpaceRelease(space);
    // Flip so that it isn't upside-down
    CGContextTranslateCTM(myBitmapContext, 0, height);
    CGContextScaleCTM(myBitmapContext, 1.0f, -1.0f);
    CGContextSetBlendMode(myBitmapContext, kCGBlendModeCopy);
    CGContextDrawImage(myBitmapContext, rect, myImageRef);
    CGContextRelease(myBitmapContext);

    GetGLError();

    // The extension GL_TEXTURE_RECTANGLE_ARB can be used for non-power of two textures, but it is slower than GL_TEXTURE_2D and not
    // supported by all graphics cards.
    glEnable(GL_TEXTURE_RECTANGLE_ARB);
    glGenTextures(1, &myTextureName);
    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, myTextureName);
    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER,GL_NEAREST);
    glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER,GL_NEAREST);
    glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameterf(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
    glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, myData);
    //glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT ,GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_RECTANGLE_ARB,myTextureName, 0);
    free(myData);

VBO創作

// Create vertex buffer
    GLuint memoryPointer = 0;
    GLuint colourMemoryPointer = 0;
    GLuint texPointer = 0;

    GLfloat *vertices;
    size_t vertex_size = 0;

    AllocateVertexBuffer(2, 4, &vertices, &vertex_size);
    CDMeshVertexesCreateRectangle(200, 200, vertices);

    GetGLError();

    // Create colour buffer
    GLfloat *colors;
    size_t color_size;

    AllocateVertexBuffer(4, 4, &colors, &color_size);
    CDMeshColorsCreateGrey(0.0, 4, colors);

    // Create Texture UV Coordinates
    GLfloat *texture;
    size_t texture_size;
    AllocateVertexBuffer(2, 4, &texture, &texture_size);
    CDMeshVertexesCreateRectangle(200, 200, texture);

    // Allocate the vertex VBO
    glGenBuffers(1, &memoryPointer);
    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);
    glBufferData(GL_ARRAY_BUFFER, vertex_size, vertices, GL_STATIC_DRAW);

    // Allocate the colour VBO
    glGenBuffers(1, &colourMemoryPointer);
    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);
    glBufferData(GL_ARRAY_BUFFER, color_size, colors, GL_STATIC_DRAW);

    // Allocate the texture VBO
    glGenBuffers(1, &texPointer);
    glBindBuffer(GL_ARRAY_BUFFER, texPointer);
    glBufferData(GL_ARRAY_BUFFER, texture_size, texture, GL_STATIC_DRAW);

渲染和刪除 VBO 和數據

// Enable client states for drawing the various arrays
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

    // Bind each buffer and use the VBO's to draw
    glBindBuffer(GL_ARRAY_BUFFER, memoryPointer);
    glVertexPointer(2, GL_FLOAT, 0, 0);   

    glBindBuffer(GL_ARRAY_BUFFER, colourMemoryPointer);
    glColorPointer(4, GL_FLOAT, 0, 0);

    glBindBuffer(GL_ARRAY_BUFFER, texPointer);
    glTexCoordPointer(2, GL_FLOAT, 0, 0);
    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, myTextureName);

    // RENDER!
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    // Disale client states as were done with them.
    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_COLOR_ARRAY);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
    glDisable(GL_TEXTURE_RECTANGLE_ARB);

    GetGLError();

    // Delete buffers when they arent being used.
    glDeleteBuffers(1, &memoryPointer);
    glDeleteBuffers(1, &colourMemoryPointer);
    glDeleteBuffers(1, &myTextureName);
    glGenTextures(GL_TEXTURE_RECTANGLE_ARB, 0);

    // Free vertexes when done using them
    free(vertices);
    free(colors);
    free(texture);

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