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Lesson 43: How texture is rendered

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Started by Sh@dow June 17, 2011 11:27 AM

0 comments, last by lc_overlord 13 years ago

Sh@dow

105

Author

June 17, 2011 11:27 AM

In Lesson 43 to render a texture from free type font we are saying:





glBegin(GL_QUADS);

	glTexCoord2d(0,0); glVertex2d(0,bitmap.rows);

	glTexCoord2d(0,y); glVertex2d(0,0);



	glTexCoord2d(x,y); glVertex2d(bitmap.width,0);

	glTexCoord2d(x,0); glVertex2d(bitmap.width,bitmap.rows);

I can't understand what does this code do? We are drawing here two quads: first has all x = 0; What does this supposed to mean?
Thanks.

lc_overlord

436

June 17, 2011 11:48 AM

no it's only one quad, if your doing texturing you need at least two sets of coordinates for each vertex, the first set given by glTexCoord2d signifies where on the texture you should read from and the second given by glVertex2d is the position on the screen, it's all really simple once you get a hang of it.

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Lesson 43: How texture is rendered

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🎉 Celebrating 25 Years of GameDev.net! 🎉

Lesson 43: How texture is rendered

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