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I'm new to graphics programming, also I don't know much about fonts. So my question is pretty basic, but I'm still having a hard time wrapping my head around it. I noticed that stbtt_GetBakedQuad returns a quad with a top left coordinate system where most OpenGL examples are bottom-up. Is there are reason for it, or is just purely a design choice. And also I would like to know in greater detail how to inverse the Y coordinate in the quad so it could be applied to a bottom- up orthographic projection. Or is there no other way around it and I have to use top-bottom ortho projection? |
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To the first, almost everything about texture coordinates is arbitrary interpretation and convention, as the meaning of 0..1 remains the same regardless of whether you think of 0..1 as bottom-to-top or top-to-bottom. The top-to-bottom convention is typical for image maps, so I tend to use the top-to-bottom convention for everything else for consistency. (The place in OpenGL where it's visible, where it's not arbitrary, is how a texture is filled when you render to a render target.) To the second, you should just be able to negate the Y offset when using a bottom-to-top projection. |
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Thank you. |
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To the first, almost everything about texture coordinates is arbitrary interpretation and convention, as the meaning of 0..1 remains the same regardless of whether you think of 0..1 as bottom-to-top or top-to-bottom. The top-to-bottom convention is typical for image maps, so I tend to use the top-to-bottom convention for everything else for consistency. (The place in OpenGL where it's visible, where it's not arbitrary, is how a texture is filled when you render to a render target.)
To the second, you should just be able to negate the Y offset when using a bottom-to-top projection.