Следующий код является модифицированной версией квадратного примера XCode для iPhone, чтобы нарисовать куб. Но когда я использую отбраковку, куб отрисовывается с отсутствующими лицами. Может кто-нибудь сказать мне, что я делаю не так?
#import "ES1Renderer.h"
@implementation ES1Renderer
// Create an OpenGL ES 1.1 context
- (id)init
{
if ((self = [super init]))
{
context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
if (!context || ![EAGLContext setCurrentContext:context])
{
[self release];
return nil;
}
// Create default framebuffer object. The backing will be allocated for the current layer in -resizeFromLayer
glGenFramebuffersOES(1, &defaultFramebuffer);
glGenRenderbuffersOES(1, &colorRenderbuffer);
glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, colorRenderbuffer);
glEnable(GL_CULL_FACE);
/*glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
const GLfloat light0Ambient[] = {0.05, 0.05, 0.05, 1.0};
glLightfv(GL_LIGHT0, GL_AMBIENT, light0Ambient);
const GLfloat light0Diffuse[] = {0.5, 0.5, 0.5, 1.0};
glLightfv(GL_LIGHT0, GL_DIFFUSE, light0Diffuse);
const GLfloat light0Specular[] = {0.7, 0.7, 0.7, 1.0};
glLightfv(GL_LIGHT0, GL_SPECULAR, light0Specular);
const GLfloat light0Position[] = {0.0, 0.0, 1.0, 0.0};
glLightfv(GL_LIGHT0, GL_POSITION, light0Position);
const GLfloat light0Direction[] = {0.0, 0.0, -1.0};
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, light0Direction);
glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 100.0); */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrthof(-1.0f, 1.0f, -1.5f, 1.5f, -1.0f, 1.0f);
glScalef(0.5f, 0.5f, 0.5f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
return self;
}
- (void)render
{
// Replace the implementation of this method to do your own custom drawing
static const GLfloat squareVertices[] = {
-0.5f, -0.5f, -0.5f, // 0
0.5f, -0.5f, -0.5f, // 1
-0.5f, 0.5f, -0.5f, // 2
0.5f, 0.5f, -0.5f, // 3
-0.5f, -0.5f, 0.5f, // 4
0.5f, -0.5f, 0.5f, // 5
-0.5f, 0.5f, 0.5f, // 6
0.5f, 0.5f, 0.5f, // 7
};
static const GLubyte squareColors[] = {
255, 0, 0, 255,
0, 255, 0, 255,
0, 0, 255, 255,
255, 255, 255, 255,
255, 0, 0, 255,
0, 255, 0, 255,
0, 0, 255, 255,
255, 255, 255, 255,
};
static const GLubyte triangles [] = {
0, 1, 2, // front
1, 3, 2,
2, 3, 6, // top
3, 7, 6,
6, 4, 5, // back
5, 7, 6,
4, 0, 1, // bottom
1, 5, 4,
4, 0, 2, // left
2, 6, 4,
1, 3, 5, // right
3, 7, 5,
};
// static float transY = 0.0f;
// This application only creates a single context which is already set current at this point.
// This call is redundant, but needed if dealing with multiple contexts.
[EAGLContext setCurrentContext:context];
// This application only creates a single default framebuffer which is already bound at this point.
// This call is redundant, but needed if dealing with multiple framebuffers.
glBindFramebufferOES(GL_FRAMEBUFFER_OES, defaultFramebuffer);
glViewport(0, 0, backingWidth, backingHeight);
glRotatef((GLfloat)1.0f, 0.0f, 0.0f, 1.0f);
// transY++;
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glVertexPointer(3, GL_FLOAT, 0, squareVertices);
glEnableClientState(GL_VERTEX_ARRAY);
glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors);
glEnableClientState(GL_COLOR_ARRAY);
//int n = ((int)[[NSDate date] timeIntervalSince1970])/2;
glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, triangles);
// This application only creates a single color renderbuffer which is already bound at this point.
// This call is redundant, but needed if dealing with multiple renderbuffers.
glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
[context presentRenderbuffer:GL_RENDERBUFFER_OES];
}
- (BOOL)resizeFromLayer:(CAEAGLLayer *)layer
{
// Allocate color buffer backing based on the current layer size
glBindRenderbufferOES(GL_RENDERBUFFER_OES, colorRenderbuffer);
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:layer];
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);
if (glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES) != GL_FRAMEBUFFER_COMPLETE_OES)
{
NSLog(@"Failed to make complete framebuffer object %x", glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES));
return NO;
}
return YES;
}
- (void)dealloc
{
// Tear down GL
if (defaultFramebuffer)
{
glDeleteFramebuffersOES(1, &defaultFramebuffer);
defaultFramebuffer = 0;
}
if (colorRenderbuffer)
{
glDeleteRenderbuffersOES(1, &colorRenderbuffer);
colorRenderbuffer = 0;
}
// Tear down context
if ([EAGLContext currentContext] == context)
[EAGLContext setCurrentContext:nil];
[context release];
context = nil;
[super dealloc];
}
@end