由于某些原因，我的纹理没有绘制，即使我的代码看起来与旧项目完全相同。到目前为止，顶点和TexCoords看起来很好，因为我正在绘制白色方块，而是应该绘制纹理。
到目前为止的过程， 我加载了一个控制器，在loadView中，我
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_SRC_COLOR);
然后我的渲染器被加载，这对构造没有任何作用。之后我将纹理加载到gl中。这段代码是我原来项目的直接副本，我知道它有效。
- (GLuint)textureFromPath:(NSString *)path
{
GLuint texture;
glGenTextures(1, &texture);
UIImage *img = [[UIImage alloc] initWithContentsOfFile:path];
if (!img) {
NSLog(@"Image \"%@\" could not be loaded and was not bound", path);
return 0;
}
CGImageRef cgimage = img.CGImage;
float width = CGImageGetWidth(cgimage);
float height = CGImageGetHeight(cgimage);
CGRect bounds = CGRectMake(0, 0, width, height);
CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB();
void *image = malloc(width * height * 4);
CGContextRef context = CGBitmapContextCreate(image, width, height, 8, 4 * width, colourSpace, kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(colourSpace);
CGContextClearRect(context, bounds);
CGContextTranslateCTM (context, 0, height);
CGContextScaleCTM (context, 1.0, -1.0);
CGContextDrawImage(context, bounds, cgimage);
CGContextRelease(context);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
[img release];
free(image);
return texture;
}
然后我从gl获取生成纹理，并在Renderer的数组中将它的位置指定为0.我也在我的旧项目中做了这个并且工作得很好。到目前为止，我觉得很好。
然后，应用程序告诉它startAnimation，然后它调用setFramebuffer，它在其中调用createFramebuffer，因为framebuffer未定义。然后它通知Renderer（顺便说一句，Renderer是一个C ++类），它已经创建了帧缓冲区。
void bufferHasBeenCreated() const {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrthof(-160.0f, 160.0f, -240.0f, 240.0f, -5.0f, 1.0f);
glViewport(0, 0, 320, 480);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_SRC_COLOR);
}
然后在Renderer上调用渲染。
void render() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glClearColor(0.325f, 0.0f, 0.325f, 1.0f);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
static float rot = 0.0f;
glRotatef(rot, 0.0f, 0.0f, 1.0f);
//glColor4f(0.0f, 0.0f, 1.0f, 1.0f);
glBindTexture(GL_TEXTURE_2D, texture_[0]);
GLenum err = glGetError();
if (err != GL_NO_ERROR)
printf("Error. glError: 0x%04X\n", err);
glVertexPointer(2, GL_FLOAT, 0, pos[0]);
glTexCoordPointer(2, GL_FLOAT, 0, black);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glVertexPointer(2, GL_FLOAT, 0, pos[1]);
glTexCoordPointer(2, GL_FLOAT, 0, black);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glVertexPointer(2, GL_FLOAT, 0, pos[2]);
glTexCoordPointer(2, GL_FLOAT, 0, black);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
rot += 0.5f;
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
然后最后调用presentFramebuffer，它绑定了renderBuffer和setup上下文。
答案 0 :(得分：1)
编辑：我已经做了更多的工作，结果发现它与上下文和缓冲区有关。每当我在启用GL_TEXTURE_2D和GL_BLEND时执行上下文操作时，纹理都不会加载。然而，当缓冲区加载并且一切正常时，请执行此操作。
我有自己的纹理。我把所有代码都拿出来放了自己的文件。然后，我将再次开始拉动它，并希望在我已经拥有的结构中完成所有工作。
（Objective-C）ES1Renderer.h
#import <QuartzCore/QuartzCore.h>
#import "OpenGLES.h"
@interface ES1Renderer : UIView {
@private
GLint backingWidth;
GLint backingHeight;
EAGLContext *context;
GLuint viewFramebuffer, viewRenderbuffer;
GLuint texture[1];
BOOL animating;
BOOL displayLinkSupported;
NSInteger animationFrameInterval;
// Use of the CADisplayLink class is the preferred method for controlling your animation timing.
// CADisplayLink will link to the main display and fire every vsync when added to a given run-loop.
// The NSTimer class is used only as fallback when running on a pre 3.1 device where CADisplayLink
// isn't available.
id displayLink;
NSTimer *animationTimer;
}
@property (readonly, nonatomic, getter=isAnimating) BOOL animating;
@property (nonatomic) NSInteger animationFrameInterval;
- (void) startAnimation;
- (void) stopAnimation;
- (void)render;
@end
下一步ES1Renderer.m
#import "ES1Renderer.h"
@implementation ES1Renderer
@synthesize animating;
@dynamic animationFrameInterval;
+ (Class)layerClass
{
return [CAEAGLLayer class];
}
- (id)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame]) {
context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
if (!context || ![EAGLContext setCurrentContext:context])
{
[self release];
return nil;
}
// Generate buffers
glGenFramebuffersOES(1, &viewFramebuffer);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glGenRenderbuffersOES(1, &viewRenderbuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
// Disable Depth
glDisable(GL_DEPTH_TEST);
// Load textures
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_SRC_COLOR);
glGenTextures(1, texture);
UIImage *img = [[UIImage alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"colour" ofType:@"png"]];
if (!img) {
NSLog(@"Image \"colour.png\" could not be loaded and was not bound");
[self release];
return nil;
}
CGImageRef cgimage = img.CGImage;
float width = CGImageGetWidth(cgimage);
float height = CGImageGetHeight(cgimage);
CGRect bounds = CGRectMake(0, 0, width, height);
CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB();
void *image = malloc(width * height * 4);
CGContextRef imgContext = CGBitmapContextCreate(image,
width, height,
8, 4 * width, colourSpace,
kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(colourSpace);
CGContextClearRect(imgContext, bounds);
CGContextTranslateCTM (imgContext, 0, height);
CGContextScaleCTM (imgContext, 1.0, -1.0);
CGContextDrawImage(imgContext, bounds, cgimage);
CGContextRelease(imgContext);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);
GLenum err = glGetError();
if (err != GL_NO_ERROR)
NSLog(@"Error. glError: 0x%04X\n", err);
free(image);
[img release];
animating = FALSE;
displayLinkSupported = FALSE;
animationFrameInterval = 1;
displayLink = nil;
animationTimer = nil;
// A system version of 3.1 or greater is required to use CADisplayLink. The NSTimer
// class is used as fallback when it isn't available.
NSString *reqSysVer = @"3.1";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)
displayLinkSupported = TRUE;
}
return self;
}
- (void)drawView:(id)sender
{
[self render];
GLenum err = glGetError();
if (err != GL_NO_ERROR)
NSLog(@"Error. glError: 0x%04X\n", err);
}
- (void) render
{
//glDisable(GL_TEXTURE_2D);
[EAGLContext setCurrentContext:context];
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
static const float textureVertices[] = {
-0.5f, -0.33f,
0.5f, -0.33f,
-0.5f, 0.33f,
0.5f, 0.33f,
};
static const float textureCoords[] = {
0.0f, 0.0f,
0.0f, 0.515625f,
0.12890625f, 0.0f,
0.12890625f, 0.515625f,
};
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBindTexture(GL_TEXTURE_2D, texture[0]);
//glColor4f(0.0f, 0.0f, 0.0f, 1.0f);
glVertexPointer(2, GL_FLOAT, 0, textureVertices);
glTexCoordPointer(2, GL_FLOAT, 0, textureCoords);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context presentRenderbuffer:GL_RENDERBUFFER_OES];
}
- (void)layoutSubviews
{
[EAGLContext setCurrentContext:context];
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer *)self.layer];
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glViewport(0, 0, backingWidth, backingHeight);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
if(glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES)
NSLog(@"failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
}
- (void) dealloc
{
// Tear down GL
if (viewFramebuffer)
{
glDeleteFramebuffersOES(1, &viewFramebuffer);
viewFramebuffer = 0;
}
if (viewRenderbuffer)
{
glDeleteRenderbuffersOES(1, &viewRenderbuffer);
viewRenderbuffer = 0;
}
// Tear down context
if ([EAGLContext currentContext] == context)
[EAGLContext setCurrentContext:nil];
[context release];
context = nil;
displayLink = nil;
animationTimer = nil;
[super dealloc];
}
- (NSInteger) animationFrameInterval
{
return animationFrameInterval;
}
- (void) setAnimationFrameInterval:(NSInteger)frameInterval
{
// Frame interval defines how many display frames must pass between each time the
// display link fires. The display link will only fire 30 times a second when the
// frame internal is two on a display that refreshes 60 times a second. The default
// frame interval setting of one will fire 60 times a second when the display refreshes
// at 60 times a second. A frame interval setting of less than one results in undefined
// behavior.
if (frameInterval >= 1)
{
animationFrameInterval = frameInterval;
if (animating)
{
[self stopAnimation];
[self startAnimation];
}
}
}
- (void) startAnimation
{
if (!animating)
{
if (displayLinkSupported)
{
// CADisplayLink is API new to iPhone SDK 3.1. Compiling against earlier versions will result in a warning, but can be dismissed
// if the system version runtime check for CADisplayLink exists in -initWithCoder:. The runtime check ensures this code will
// not be called in system versions earlier than 3.1.
displayLink = [NSClassFromString(@"CADisplayLink") displayLinkWithTarget:self selector:@selector(drawView:)];
[displayLink setFrameInterval:animationFrameInterval];
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}
else
animationTimer = [NSTimer scheduledTimerWithTimeInterval:(NSTimeInterval)((1.0 / 60.0) * animationFrameInterval) target:self selector:@selector(drawView:) userInfo:nil repeats:TRUE];
animating = TRUE;
}
}
- (void)stopAnimation
{
if (animating)
{
if (displayLinkSupported)
{
[displayLink invalidate];
displayLink = nil;
}
else
{
[animationTimer invalidate];
animationTimer = nil;
}
animating = FALSE;
}
}
@end
此代码只有一个问题。它已经过时了。 Apple发布了一种新的做事方式，但地狱。它有效。
<强>更新 事实证明我在加载纹理之前已经设置了上下文。