我一直在尝试使用C++中的FreeImage来显示图像,但一直遇到很多问题。虽然load函数似乎成功加载了图像,但它似乎没有绑定图像。以下是我的代码:
GLuint Load(){
string imgdir = "Path to my file";
FREE_IMAGE_FORMAT fif = FreeImage_GetFIFFromFilename(imgdir.c_str());
FIBITMAP *bitmap = FreeImage_Load(fif,imgdir.c_str(),0);
int height, width;
height = FreeImage_GetHeight(bitmap);
width = FreeImage_GetWidth(bitmap);
GLuint textureid;
glGenTextures(1, &textureid);
glBindTexture(GL_TEXTURE_2D, textureid);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0,GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, bitmap);
FreeImage_Unload(bitmap);
return textureid;}
void Square(){
glBindTexture(GL_TEXTURE_2D, tex);
glBegin(GL_QUADS);
glTexCoord2f(0.0, 0.0);glVertex3f(0.0, 0.0, 0.0);
glTexCoord2f(1.0, 0.0);glVertex3f(3.0, 0.0, 0.0);
glTexCoord2f(1.0, 1.0);glVertex3f(3.0, 5.0, 0.0);
glTexCoord2f(0.0, 1.0);glVertex3f(0.0, 5.0, 0.0);
glEnd();}
我只能看到一个白色矩形,希望能得到正确的指引。
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, (void*)FreeImage_GetBits(bitmap))
。如果这不起作用,我认为问题在于FreeImage_GetBits
的输出具有不同的对齐方式,您需要提前显式地创建缓冲区,如此处所述。 - Kamyar Infinity