平铺纹理bmp文件作为纹理到OpenGL上的矩形？ [英] Tiling texture bmp file as texture onto a rectangle in OpenGL?

问题描述

我有一个pic.bmp，我试图平铺到一个3×2矩形平面上进行演示。

I have a pic.bmp that I'm attempting to tile onto a 3 x 2 rectangular flat surface for a demo I'm making.

尝试保持bmp的高宽比在tact中，但我仍然想要平铺它跨越表面。现在我有表面顶点为（0,0,0），（3,0,0），（0,2,0）和（3,2,0）。

I'm attempting to keep the aspect ratio of the bmp in tact but I still want to tile it across that surface. Right now I have the surfaces vertices as (0,0,0), (3,0,0), (0,2,0) and (3,2,0).

如何将此bmp应用于平坦表面并平铺？什么是最好的方法来做到这一点在GLUT& OpenGL？

How can I apply this bmp to the flat surface and tile it? What is the best way to do this in GLUT & OpenGL?

推荐答案

查看本NeHe课。要做平铺只需这样写：

See this NeHe lesson for a sample. To do tiling just write something like this:

glBegin(GL_QUADS);
    	// your surface
    	glTexCoord2f(0.0f, 0.0f); glVertex3f( 0.0f,  0.0f,  0.0f);	
    	glTexCoord2f(3.0f, 0.0f); glVertex3f( 3.0f,  0.0f,  0.0f);	
    	glTexCoord2f(3.0f, 2.0f); glVertex3f( 3.0f,  2.0f,  0.0f);	
    	glTexCoord2f(0.0f, 2.0f); glVertex3f( 0.0f,  2.0f,  0.0f);	
glEnd();

这将设置纹理坐标以在此曲面上任意纹理贴图3x2次。

This will set texture coordinates to tile any texture 3x2 times on this surface.

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