我目前正在将一个立方体贴图加载到我的应用程序中,但它显示为红色。 编辑:使用2D纹理时,通道问题也存在,看起来通道的顺序不正确。有什么方法可以使用iOS方法更改频道的顺序?OpenGL ES 2.0/MonoTouch:纹理是彩色的红色
这对纹理加载代码:
public TextureCube (Generic3DView device, UIImage right, UIImage left, UIImage top, UIImage bottom, UIImage front, UIImage back)
: base(device)
{
_Device = device;
GL.GenTextures (1, ref _Handle);
GL.BindTexture (TextureType, _Handle);
LoadTexture(All.TextureCubeMapPositiveX, right);
LoadTexture(All.TextureCubeMapNegativeX, left);
LoadTexture(All.TextureCubeMapPositiveY, top);
LoadTexture(All.TextureCubeMapNegativeY, bottom);
LoadTexture(All.TextureCubeMapPositiveZ, front);
LoadTexture(All.TextureCubeMapNegativeZ, back);
GL.TexParameter(All.TextureCubeMap, All.TextureMinFilter, (Int32)All.LinearMipmapLinear);
GL.TexParameter(All.TextureCubeMap, All.TextureMagFilter, (Int32)All.Linear);
GL.GenerateMipmap(All.TextureCubeMap);
}
private void LoadTexture(All usage, UIImage image)
{
GL.TexImage2D(usage, 0, (Int32)All.Rgba, (Int32)image.Size.Width,
(Int32)image.Size.Height, 0, All.Rgba, All.UnsignedByte, RequestImagePixelData(image));
}
protected CGBitmapContext CreateARGBBitmapContext (CGImage inImage)
{
var pixelsWide = inImage.Width;
var pixelsHigh = inImage.Height;
var bitmapBytesPerRow = pixelsWide * 4;
var bitmapByteCount = bitmapBytesPerRow * pixelsHigh;
//Note implicit colorSpace.Dispose()
using (var colorSpace = CGColorSpace.CreateDeviceRGB()) {
//Allocate the bitmap and create context
var bitmapData = Marshal.AllocHGlobal (bitmapByteCount);
if (bitmapData == IntPtr.Zero) {
throw new Exception ("Memory not allocated.");
}
var context = new CGBitmapContext (bitmapData, pixelsWide, pixelsHigh, 8,
bitmapBytesPerRow, colorSpace, CGImageAlphaInfo.PremultipliedFirst);
if (context == null) {
throw new Exception ("Context not created");
}
return context;
}
}
//Store pixel data as an ARGB Bitmap
protected IntPtr RequestImagePixelData (UIImage inImage)
{
var imageSize = inImage.Size;
CGBitmapContext ctxt = CreateARGBBitmapContext (inImage.CGImage);
var rect = new RectangleF (0.0f, 0.0f, imageSize.Width, imageSize.Height);
ctxt.DrawImage (rect, inImage.CGImage);
var data = ctxt.Data;
return data;
}
我认为信道被反转,但也许有一种方法反转位图没有一些自定义代码。
这是被描绘的图像(忽略在它前面的花式模型):
和预期的图像:
编辑:
的GL_INVALID_OPERATION问题已得到解决,但它不能解决红色纹理问题。
顶点着色器:
attribute vec3 position;
uniform mat4 modelViewMatrix;
varying mediump vec3 texture;
void main()
{
texture = position.xyz;
gl_Position = modelViewMatrix * vec4(position.xyz, 1.0);
}
片段着色器:
varying mediump vec3 texture;
uniform samplerCube cubeMap;
void main()
{
mediump vec3 cube = vec3(textureCube(cubeMap, texture));
gl_FragColor = vec4(cube.xyz, 1.0);
}
你可以发布你正在得到的图片和你期望得到的图片吗? – NickLH
我上传了两张图片。 –
什么代码正在绘制图片? – Dani