Here's a primitive 5x2 texture, defined in RGB and RGBA formats.
// 1 2 3 4 5
unsigned char rgb[] = { 0, 0, 0, 0, 0, 0, 200, 200, 200, 0, 0, 0, 200, 200, 200,
0, 0, 0, 0, 0, 0, 200, 200, 200, 0, 0, 0, 200, 200, 200, };
unsigned char rgba[] = { 0, 0, 0, 255, 0, 0, 0, 255, 200, 200, 200, 255, 0, 0, 0, 255, 200, 200, 200, 255,
0, 0, 0, 255, 0, 0, 0, 255, 200, 200, 200, 255, 0, 0, 0, 255, 200, 200, 200, 255, };
Loading the RGBA version works as expected:
glTexImage2D(GL_TEXTURE_2D,
0, // mipmap level
GL_RGB, // dest format
5, // width
2, // height
0, // deprecated
GL_RGBA, // source format
GL_UNSIGNED_BYTE,
rgba);
Loading the RGB texture results in a weird color shift:
glTexImage2D(GL_TEXTURE_2D,
0, // mipmap level
GL_RGB, // dest format
5, // width
2, // height
0, // deprecated
GL_RGB, // source format
GL_UNSIGNED_BYTE,
rgb);
The difference in the code between the first and the second screenshot are just those two arguments to glTexImage2D.
What am I doing wrong?
Environment
看到这里 - glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
应该修复它。
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