How to properly map a 2D map for tile rendering?

[Patryk Kizny]

Hey,

Probably that's simple, but can't seem to get it right.
I am loading a flat background image into a sampler2D.
The texture should serve as a background so it should be 2D mapped onto entire buffer.
I am using the following code:

Code:

vec3 bg = texture2D(gl_FragCoord.xy * PixelScale).xyz;

It renders properly in the main buffer and in highres rendering it renders fine if doing 1x1 tile.
But when there's more tiles involved, apparently background texture coordinate seem to restart every tile.
How should I be doing that properly?

[Patryk Kizny]

Anyone?

[_revers_]

Try using:

Code:

varying vec2 coord;
varying vec2 viewCoord;
varying vec2 viewCoord2;

from 3D.frag, i.e.:

Code:

vec3 bg = texture2D(Texture, coord).xyz;
vec3 bg = texture2D(Texture, viewCoord).xyz;
vec3 bg = texture2D(Texture, viewCoord2).xyz;

One of them should work.

[Patryk Kizny]

vec2 pos = (viewCoord2+vec2(1.0))*0.5;

That's what worked for both main buffer and tile based rendering.
Huge thanks!