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/*
===== IMPORTANT =====
This is sample code demonstrating API, technology or techniques in development.
Although this sample code has been reviewed for technical accuracy, it is not
final. Apple is supplying this information to help you plan for the adoption of
the technologies and programming interfaces described herein. This information
is subject to change, and software implemented based on this sample code should
be tested with final operating system software and final documentation. Newer
versions of this sample code may be provided with future seeds of the API or
technology. For information about updates to this and other developer
documentation, view the New & Updated sidebars in subsequent documentation
seeds.
=====================
File: AC3DTexture.m
Abstract: Convenience class that allows to create OpenGL 2D textures from
images, text or raw data.
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under
Apple's copyrights in this original Apple software (the "Apple Software"), to
use, reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions
of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc. may be used
to endorse or promote products derived from the Apple Software without specific
prior written permission from Apple. Except as expressly stated in this notice,
no other rights or licenses, express or implied, are granted by Apple herein,
including but not limited to any patent rights that may be infringed by your
derivative works or by other works in which the Apple Software may be
incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR
DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF
CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF
APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2008 Apple Inc. All Rights Reserved.
*/
#import <OpenGLES/ES1/glext.h>
#import "AC3DTexture.h"
#import "OpenGL_Internal.h"
//CONSTANTS:
#define kMaxTextureSize 1024
//CLASS IMPLEMENTATIONS:
@implementation AC3DTexture
@synthesize contentSize=_size, pixelFormat=_format, pixelsWide=_width, pixelsHigh=_height, name=_name, maxS=_maxS, maxT=_maxT;
- (id) initWithData:(const void*)data pixelFormat:(AC3DTexturePixelFormat)pixelFormat pixelsWide:(NSUInteger)width pixelsHigh:(NSUInteger)height contentSize:(CGSize)size
{
GLint saveName;
if((self = [super init])) {
glGenTextures(1, &_name);
glGetIntegerv(GL_TEXTURE_BINDING_2D, &saveName);
glBindTexture(GL_TEXTURE_2D, _name);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
//glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
switch(pixelFormat) {
case kAC3DTexturePixelFormat_RGBA8888:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
break;
case kAC3DTexturePixelFormat_RGBA4444:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, data);
break;
case kAC3DTexturePixelFormat_RGBA5551:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, data);
break;
case kAC3DTexturePixelFormat_RGB565:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, data);
break;
case kAC3DTexturePixelFormat_RGB888:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
break;
case kAC3DTexturePixelFormat_L8:
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width, height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
break;
case kAC3DTexturePixelFormat_A8:
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data);
break;
case kAC3DTexturePixelFormat_LA88:
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, width, height, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, data);
break;
case kAC3DTexturePixelFormat_RGB_PVRTC2:
glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG, width, height, 0, (width * height) / 4, data);
break;
case kAC3DTexturePixelFormat_RGB_PVRTC4:
glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG, width, height, 0, (width * height) / 2, data);
break;
case kAC3DTexturePixelFormat_RGBA_PVRTC2:
glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG, width, height, 0, (width * height) / 4, data);
break;
case kAC3DTexturePixelFormat_RGBA_PVRTC4:
glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG, width, height, 0, (width * height) / 2, data);
break;
default:
[NSException raise:NSInternalInconsistencyException format:@""];
}
glBindTexture(GL_TEXTURE_2D, saveName);
if(!CHECK_GL_ERROR()) {
[self release];
return nil;
}
_size = size;
_width = width;
_height = height;
_format = pixelFormat;
_maxS = size.width / (float)width;
_maxT = size.height / (float)height;
}
return self;
}
- (void) dealloc
{
if(_name)
glDeleteTextures(1, &_name);
[super dealloc];
}
- (NSString*) description
{
return [NSString stringWithFormat:@"<%@ = %08X | Name = %i | Dimensions = %ix%i | Coordinates = (%.2f, %.2f)>", [self class], self, _name, _width, _height, _maxS, _maxT];
}
@end
@implementation AC3DTexture (Image)
- (id) initWithImagePath:(NSString*)path
{
return [self initWithImagePath:path sizeToFit:NO];
}
- (id) initWithImagePath:(NSString*)path sizeToFit:(BOOL)sizeToFit
{
return [self initWithImagePath:path sizeToFit:sizeToFit pixelFormat:kAC3DTexturePixelFormat_Automatic];
}
- (id) initWithImagePath:(NSString*)path sizeToFit:(BOOL)sizeToFit pixelFormat:(AC3DTexturePixelFormat)pixelFormat
{
UIImage* uiImage;
NSString* enterPath = path;
if(![path isAbsolutePath])
path = [[NSBundle mainBundle] pathForResource:path ofType:nil];
uiImage = [[UIImage alloc] initWithContentsOfFile:path];
self = [self initWithCGImage:[uiImage CGImage] orientation:[uiImage imageOrientation] sizeToFit:sizeToFit pixelFormat:pixelFormat];
[uiImage release];
if(self == nil)
REPORT_ERROR(@"Failed loading image at path \"%@\"", enterPath);
return self;
}
- (id) initWithCGImage:(CGImageRef)image orientation:(UIImageOrientation)orientation sizeToFit:(BOOL)sizeToFit pixelFormat:(AC3DTexturePixelFormat)pixelFormat
{
NSUInteger width,
height,
i;
CGContextRef context = nil;
void* data = nil;;
CGColorSpaceRef colorSpace;
void* tempData;
unsigned char* inPixel8;
unsigned int* inPixel32;
unsigned char* outPixel8;
unsigned short* outPixel16;
BOOL hasAlpha;
CGImageAlphaInfo info;
CGAffineTransform transform;
CGSize imageSize;
if(image == NULL) {
[self release];
return nil;
}
if(pixelFormat == kAC3DTexturePixelFormat_Automatic) {
info = CGImageGetAlphaInfo(image);
hasAlpha = ((info == kCGImageAlphaPremultipliedLast) || (info == kCGImageAlphaPremultipliedFirst) || (info == kCGImageAlphaLast) || (info == kCGImageAlphaFirst) ? YES : NO);
if(CGImageGetColorSpace(image)) {
if(CGColorSpaceGetModel(CGImageGetColorSpace(image)) == kCGColorSpaceModelMonochrome) {
if(hasAlpha) {
pixelFormat = kAC3DTexturePixelFormat_LA88;
#if __DEBUG__
if((CGImageGetBitsPerComponent(image) != 8) && (CGImageGetBitsPerPixel(image) != 16))
REPORT_ERROR(@"Unoptimal image pixel format for image at path \"%@\"", path);
#endif
}
else {
pixelFormat = kAC3DTexturePixelFormat_L8;
#if __DEBUG__
if((CGImageGetBitsPerComponent(image) != 8) && (CGImageGetBitsPerPixel(image) != 8))
REPORT_ERROR(@"Unoptimal image pixel format for image at path \"%@\"", path);
#endif
}
}
else {
if((CGImageGetBitsPerPixel(image) == 16) && !hasAlpha)
pixelFormat = kAC3DTexturePixelFormat_RGBA5551;
else {
if(hasAlpha)
pixelFormat = kAC3DTexturePixelFormat_RGBA8888;
else {
pixelFormat = kAC3DTexturePixelFormat_RGB565;
#if __DEBUG__
if((CGImageGetBitsPerComponent(image) != 8) && (CGImageGetBitsPerPixel(image) != 24))
REPORT_ERROR(@"Unoptimal image pixel format for image at path \"%s\"", path);
#endif
}
}
}
}
else { //NOTE: No colorspace means a mask image
pixelFormat = kAC3DTexturePixelFormat_A8;
#if __DEBUG__
if((CGImageGetBitsPerComponent(image) != 8) && (CGImageGetBitsPerPixel(image) != 8))
REPORT_ERROR(@"Unoptimal image pixel format for image at path \"%@\"", path);
#endif
}
}
imageSize = CGSizeMake(CGImageGetWidth(image), CGImageGetHeight(image));
switch(orientation) {
case UIImageOrientationUp: //EXIF = 1
transform = CGAffineTransformIdentity;
break;
case UIImageOrientationUpMirrored: //EXIF = 2
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;
case UIImageOrientationDown: //EXIF = 3
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationDownMirrored: //EXIF = 4
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;
case UIImageOrientationLeftMirrored: //EXIF = 5
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationLeft: //EXIF = 6
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationRightMirrored: //EXIF = 7
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
case UIImageOrientationRight: //EXIF = 8
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
default:
[NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];
}
if((orientation == UIImageOrientationLeftMirrored) || (orientation == UIImageOrientationLeft) || (orientation == UIImageOrientationRightMirrored) || (orientation == UIImageOrientationRight))
imageSize = CGSizeMake(imageSize.height, imageSize.width);
width = imageSize.width;
if((width != 1) && (width & (width - 1))) {
i = 1;
while((sizeToFit ? 2 * i : i) < width)
i *= 2;
width = i;
}
height = imageSize.height;
if((height != 1) && (height & (height - 1))) {
i = 1;
while((sizeToFit ? 2 * i : i) < height)
i *= 2;
height = i;
}
while((width > kMaxTextureSize) || (height > kMaxTextureSize)) {
#if __DEBUG__
REPORT_ERROR(@"Image at %ix%i pixels is too big to fit in texture", width, height);
#endif
width /= 2;
height /= 2;
transform = CGAffineTransformScale(transform, 0.5, 0.5);
imageSize.width *= 0.5;
imageSize.height *= 0.5;
}
switch(pixelFormat) {
case kAC3DTexturePixelFormat_RGBA8888:
case kAC3DTexturePixelFormat_RGBA4444:
colorSpace = CGColorSpaceCreateDeviceRGB();
data = malloc(height * width * 4);
context = CGBitmapContextCreate(data, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
break;
case kAC3DTexturePixelFormat_RGBA5551:
colorSpace = CGColorSpaceCreateDeviceRGB();
data = malloc(height * width * 2);
context = CGBitmapContextCreate(data, width, height, 5, 2 * width, colorSpace, kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder16Little);
CGColorSpaceRelease(colorSpace);
break;
case kAC3DTexturePixelFormat_RGB888:
case kAC3DTexturePixelFormat_RGB565:
colorSpace = CGColorSpaceCreateDeviceRGB();
data = malloc(height * width * 4);
context = CGBitmapContextCreate(data, width, height, 8, 4 * width, colorSpace, kCGImageAlphaNoneSkipLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
break;
case kAC3DTexturePixelFormat_L8:
colorSpace = CGColorSpaceCreateDeviceGray();
data = malloc(height * width);
context = CGBitmapContextCreate(data, width, height, 8, width, colorSpace, kCGImageAlphaNone);
CGColorSpaceRelease(colorSpace);
break;
case kAC3DTexturePixelFormat_A8:
data = malloc(height * width);
context = CGBitmapContextCreate(data, width, height, 8, width, NULL, kCGImageAlphaOnly);
break;
case kAC3DTexturePixelFormat_LA88:
colorSpace = CGColorSpaceCreateDeviceRGB();
data = malloc(height * width * 4);
context = CGBitmapContextCreate(data, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
break;
default:
[NSException raise:NSInternalInconsistencyException format:@"Invalid pixel format"];
}
if(context == NULL) {
REPORT_ERROR(@"Failed creating CGBitmapContext", NULL);
free(data);
[self release];
return nil;
}
if(sizeToFit)
CGContextScaleCTM(context, (CGFloat)width / imageSize.width, (CGFloat)height / imageSize.height);
else {
CGContextClearRect(context, CGRectMake(0, 0, width, height));
CGContextTranslateCTM(context, 0, height - imageSize.height);
}
if(!CGAffineTransformIsIdentity(transform))
CGContextConcatCTM(context, transform);
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image);
//Convert "-RRRRRGGGGGBBBBB" to "RRRRRGGGGGBBBBBA"
if(pixelFormat == kAC3DTexturePixelFormat_RGBA5551) {
outPixel16 = (unsigned short*)data;
for(i = 0; i < width * height; ++i, ++outPixel16)
*outPixel16 = *outPixel16 << 1 | 0x0001;
#if __DEBUG__
REPORT_ERROR(@"Falling off fast-path converting pixel data from ARGB1555 to RGBA5551", NULL);
#endif
}
//Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRRRRRGGGGGGGGBBBBBBBB"
else if(pixelFormat == kAC3DTexturePixelFormat_RGB888) {
tempData = malloc(height * width * 3);
inPixel8 = (unsigned char*)data;
outPixel8 = (unsigned char*)tempData;
for(i = 0; i < width * height; ++i) {
*outPixel8++ = *inPixel8++;
*outPixel8++ = *inPixel8++;
*outPixel8++ = *inPixel8++;
inPixel8++;
}
free(data);
data = tempData;
#if __DEBUG__
REPORT_ERROR(@"Falling off fast-path converting pixel data from RGBA8888 to RGB888", NULL);
#endif
}
//Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGGGBBBBB"
else if(pixelFormat == kAC3DTexturePixelFormat_RGB565) {
tempData = malloc(height * width * 2);
inPixel32 = (unsigned int*)data;
outPixel16 = (unsigned short*)tempData;
for(i = 0; i < width * height; ++i, ++inPixel32)
*outPixel16++ = ((((*inPixel32 >> 0) & 0xFF) >> 3) << 11) | ((((*inPixel32 >> 8) & 0xFF) >> 2) << 5) | ((((*inPixel32 >> 16) & 0xFF) >> 3) << 0);
free(data);
data = tempData;
#if __DEBUG__
REPORT_ERROR(@"Falling off fast-path converting pixel data from RGBA8888 to RGB565", NULL);
#endif
}
//Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGBBBBAAAA"
else if(pixelFormat == kAC3DTexturePixelFormat_RGBA4444) {
tempData = malloc(height * width * 2);
inPixel32 = (unsigned int*)data;
outPixel16 = (unsigned short*)tempData;
for(i = 0; i < width * height; ++i, ++inPixel32)
*outPixel16++ = ((((*inPixel32 >> 0) & 0xFF) >> 4) << 12) | ((((*inPixel32 >> 8) & 0xFF) >> 4) << 8) | ((((*inPixel32 >> 16) & 0xFF) >> 4) << 4) | ((((*inPixel32 >> 24) & 0xFF) >> 4) << 0);
free(data);
data = tempData;
#if __DEBUG__
REPORT_ERROR(@"Falling off fast-path converting pixel data from RGBA8888 to RGBA4444", NULL);
#endif
}
//Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "LLLLLLLLAAAAAAAA"
else if(pixelFormat == kAC3DTexturePixelFormat_LA88) {
tempData = malloc(height * width * 3);
inPixel8 = (unsigned char*)data;
outPixel8 = (unsigned char*)tempData;
for(i = 0; i < width * height; ++i) {
*outPixel8++ = *inPixel8++;
inPixel8 += 2;
*outPixel8++ = *inPixel8++;
}
free(data);
data = tempData;
#if __DEBUG__
REPORT_ERROR(@"Falling off fast-path converting pixel data from RGBA8888 to LA88", NULL);
#endif
}
self = [self initWithData:data pixelFormat:pixelFormat pixelsWide:width pixelsHigh:height contentSize:imageSize];
CGContextRelease(context);
free(data);
return self;
}
@end
@implementation AC3DTexture (Text)
- (id) initWithString:(NSString*)string dimensions:(CGSize)dimensions alignment:(UITextAlignment)alignment fontName:(NSString*)name fontSize:(CGFloat)size
{
return [self initWithString:string dimensions:dimensions alignment:alignment font:[UIFont fontWithName:name size:size]];
}
- (id) initWithString:(NSString*)string dimensions:(CGSize)dimensions alignment:(UITextAlignment)alignment font:(UIFont*)font
{
NSUInteger width,
height,
i;
CGContextRef context;
void* data;
CGColorSpaceRef colorSpace;
if(font == nil) {
REPORT_ERROR(@"Invalid font", NULL);
[self release];
return nil;
}
width = dimensions.width;
if((width != 1) && (width & (width - 1))) {
i = 1;
while(i < width)
i *= 2;
width = i;
}
height = dimensions.height;
if((height != 1) && (height & (height - 1))) {
i = 1;
while(i < height)
i *= 2;
height = i;
}
colorSpace = CGColorSpaceCreateDeviceGray();
data = calloc(height, width);
context = CGBitmapContextCreate(data, width, height, 8, width, colorSpace, kCGImageAlphaNone);
CGColorSpaceRelease(colorSpace);
if(context == NULL) {
REPORT_ERROR(@"Failed creating CGBitmapContext", NULL);
free(data);
[self release];
return nil;
}
CGContextSetGrayFillColor(context, 1.0, 1.0);
CGContextTranslateCTM(context, 0.0, height);
CGContextScaleCTM(context, 1.0, -1.0); //NOTE: NSString draws in UIKit referential i.e. renders upside-down compared to CGBitmapContext referential
UIGraphicsPushContext(context);
[string drawInRect:CGRectMake(0, 0, dimensions.width, dimensions.height) withFont:font lineBreakMode:UILineBreakModeWordWrap alignment:alignment];
UIGraphicsPopContext();
self = [self initWithData:data pixelFormat:kAC3DTexturePixelFormat_L8 pixelsWide:width pixelsHigh:height contentSize:dimensions];
CGContextRelease(context);
free(data);
return self;
}
@end
@implementation AC3DTexture (Drawing)
- (void) preload
{
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
[self drawInRect:CGRectMake(-2, -2, 0.1, 0.1)];
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
}
- (void) drawAtPoint:(CGPoint)point
{
[self drawAtPoint:point depth:0.0];
}
- (void) drawAtPoint:(CGPoint)point depth:(CGFloat)depth
{
GLfloat coordinates[] = {
0, _maxT,
_maxS, _maxT,
0, 0,
_maxS, 0
};
GLfloat width = (GLfloat)_width * _maxS,
height = (GLfloat)_height * _maxT;
GLfloat vertices[] = {
-width / 2 + point.x, -height / 2 + point.y, depth,
width / 2 + point.x, -height / 2 + point.y, depth,
-width / 2 + point.x, height / 2 + point.y, depth,
width / 2 + point.x, height / 2 + point.y, depth
};
glBindTexture(GL_TEXTURE_2D, _name);
glVertexPointer(3, GL_FLOAT, 0, vertices);
glTexCoordPointer(2, GL_FLOAT, 0, coordinates);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
- (void) drawInRect:(CGRect)rect
{
[self drawInRect:rect depth:0.0];
}
- (void) drawInRect:(CGRect)rect depth:(CGFloat)depth
{
GLfloat coordinates[] = {
0, _maxT,
_maxS, _maxT,
0, 0,
_maxS, 0
};
GLfloat vertices[] = {
rect.origin.x, rect.origin.y, depth,
rect.origin.x + rect.size.width, rect.origin.y, depth,
rect.origin.x, rect.origin.y + rect.size.height, depth,
rect.origin.x + rect.size.width, rect.origin.y + rect.size.height, depth
};
glBindTexture(GL_TEXTURE_2D, _name);
glVertexPointer(3, GL_FLOAT, 0, vertices);
glTexCoordPointer(2, GL_FLOAT, 0, coordinates);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
@end