c - How do I fill the screen with a rectangle in OpenGL ortho mode?

Question

I have a single 640x480 texture that needs to fill the screen. So far, I can make it work with a square texture, but not a rectangular one.

glViewport(0, 0, display->w, display->h);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();

double aspectRatio = (double)display->w / (double)display->h;

if (display->w <= display->h)
    glOrtho(-1, 1, -1 / aspectRatio, 1 / aspectRatio, -1, 1);
else
    glOrtho(-1 * aspectRatio, 1 * aspectRatio, -1, 1, -1, 1);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

What modifications do I need to make so that it will fit any texture to the screen, regardless of its aspect ratio?

Answer 1

这可能有一些相关性。

在OpenGL中将纹理bmp文件作为纹理平铺到矩形上？

您可能希望将 ARB 扩展纹理矩形视为（假设 glTexImage2D？）http://glprogramming.com/red/chapter09.html的替代方法