Hi,
I am learning openGL now. But I found that it is very complicated with the vertex value. I dont even know what values should I put in order to draw a simple cube. So, I plan to draw out a texture that I import from an image directly. Is it possible?
There are a lots of array in openGL. I am totally lost here. What kind of array should I use for texture?
A cube? Make it -1.0 to 1.0.
No, you can't draw a texture. You can only texturemap polygons.
What kind of array to use for a texture?
Assuming your image data is RGBA8, declare your array as
GLubyte *myarray = new GLubyte[w*h*4];
You might want to read the Red Book.
This is the online version of the first Red Book.
http://fly.cc.fer.hr/~unreal/theredbook/
and click on
Chapter 9: Texture Mapping
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
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