OpenGL：MipMap

OpenGL：MipMap

imageData = readImage();

 

glEnable(GL_TEXTURE_2D);

glGenTextures(1, &texture[0]);

glBindTexture(GL_TEXTURE_2D, texture[0]);

 

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, g_envMode);

// GL_DECAL, GL_BLEND , GL_MODULATE

decal是直接画上去覆盖原来的颜色值

blend为 r = src.r * (1-alpha) + dis.r * alpha

modulate为 r = src.r * dis.r
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, 512, 512, GL_RGB, GL_FLOAT, imageData);

delete[](imageData);
imageData = NULL;