X and Y coordinates and OpenGL

Graphics and GPU Programming Programming OpenGL

Started by dist0rted December 17, 2005 01:41 PM

1 comment, last by Zongo 18 years, 4 months ago

100

Author

December 17, 2005 01:41 PM

I've just began OpenGL and gotten to texture mapping and all, but I was curious... Can you make the X and Y values optimized for 2D (Ex. 300x200 instead of 1.0fx0.0f)?

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Red_falcon

151

December 17, 2005 01:48 PM

Yes. Switch to ortho mode and then you have it. Use the something like that glVertex2i. (i) stands for integer.

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Zongo

208

December 18, 2005 04:10 AM

If it's for texture coordinates, I guess you could just add a texture matrix transform:

glMatrixMode( GL_TEXTURE );glScalef( 1.f / size_texture_X, 1.f / size_texture_Y, 1.f );glMatrixMode( GL_MODELVIEW );// Draw your 2D stuff here ...// Restore the texture matrix for 3D drawingglMatrixMode( GL_TEXTURE );glLoadIdentity();glMatrixMode( GL_MODELVIEW );

HTH.

[Edited by - Zongo on December 18, 2005 4:10:19 AM]

X and Y coordinates and OpenGL

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