GL_CLAMP_TO_EDGE应该在NPOT纹理中使用

Question

我有两张图片:

1. PNG(sRGB)64x64(从网络下载)
2. PNG(sRGB),从fla移植到png,然后从png移植到带有sRGB的jpg,再移到PNG(sRGB).

我正在尝试使用此图像创建的纹理填充多边形:

CCTexture2D *texture = [[CCTextureCache sharedTextureCache] addImage:spriteName];

    polygon = [[[PhisicsFilledPoligon alloc] initWithPoints:points
                         andTexture:texture] autorelease];

PhysicsFilledPolygon是box2d的PhysicsSprite,但是有了'draw'方法:

-(void) draw 
{
    ccGLBindTexture2D( [self.texture name] );

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position | kCCVertexAttribFlag_TexCoords );

    [prog use];
    [prog setUniformForModelViewProjectionMatrix];

    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, sizeof(CGPoint), areaTrianglePoints);
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, sizeof(CGPoint), textureCoordinates);

    glDrawArrays(GL_TRIANGLES, 0, areaTrianglePointCount);
}

当我想使用第一张图像进行纹理时,一切正常.但由于我正在使用第二个,应用程序崩溃错误:

*** Assertion failure in -[CCTexture2D setTexParameters:], /Users/SentineL/Documents/squirrels ios/squirrels/libs/cocos2d/CCTexture2D.m:743
2012-05-18 14:42:26.603 squirrels[21436:707] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'GL_CLAMP_TO_EDGE should be used in NPOT textures'

我试图使用什么图像,结果是同样的错误.Cocos2d版本是2.0 rc0.这是启动cocos2d信息:

2012-05-18 14:42:25.038 squirrels[21436:707] cocos2d: OS version: 5.1 (0x05010000)
2012-05-18 14:42:25.041 squirrels[21436:707] cocos2d: GL_VENDOR:   Imagination Technologies
2012-05-18 14:42:25.042 squirrels[21436:707] cocos2d: GL_RENDERER: PowerVR SGX 543
2012-05-18 14:42:25.044 squirrels[21436:707] cocos2d: GL_VERSION:  OpenGL ES 2.0 IMGSGX543-63.24
2012-05-18 14:42:25.047 squirrels[21436:707] cocos2d: GL_MAX_TEXTURE_SIZE: 4096
2012-05-18 14:42:25.048 squirrels[21436:707] cocos2d: GL_MAX_TEXTURE_UNITS: 8
2012-05-18 14:42:25.049 squirrels[21436:707] cocos2d: GL_MAX_SAMPLES: 4
2012-05-18 14:42:25.051 squirrels[21436:707] cocos2d: GL supports PVRTC: YES
2012-05-18 14:42:25.053 squirrels[21436:707] cocos2d: GL supports BGRA8888 textures: YES
2012-05-18 14:42:25.054 squirrels[21436:707] cocos2d: GL supports NPOT textures: YES
2012-05-18 14:42:25.056 squirrels[21436:707] cocos2d: GL supports discard_framebuffer: YES
2012-05-18 14:42:25.057 squirrels[21436:707] cocos2d: compiled with Profiling Support: NO

2012-05-18 14:42:25.059 squirrels[21436:707] cocos2d: **** WARNING **** CC_ENABLE_GL_STATE_CACHE is disabled. To improve performance, enable it by editing ccConfig.h

2012-05-18 14:42:25.061 squirrels[21436:707] cocos2d: cocos2d v2.0.0-rc0
2012-05-18 14:42:25.063 squirrels[21436:707] cocos2d: Using Director Type:CCDirectorDisplayLink
2012-05-18 14:42:25:201 squirrels[21436:707] Retina Display Not supported
2012-05-18 14:42:25.214 squirrels[21436:707] cocos2d: animation started with frame interval: 60.00
2012-05-18 14:42:25.234 squirrels[21436:707] cocos2d: surface size: 1024x768

我的问题在哪里？

Answer 1

你正在使用Not-Power-Of-Two维度的纹理.

Answer 2

我认为,问题在于:

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

GL_REPEAT不是NPOT纹理的核心OpenGL ES 2.0规范的一部分,只有GL_CLAMP_TO_EDGE,因此不支持GL_REPEAT.

您需要基本上设置GL_CLAMP_TO_EDGE而不是GL_REPEAT,或者使用POT纹理.