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Welcome to Fractal Forums > Fractal Software > Programming > Fragmentarium > How to properly map a 2D map for tile rendering?
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Author Topic: How to properly map a 2D map for tile rendering?  (Read 1306 times)
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Patryk Kizny
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« on: August 03, 2015, 01:22:15 AM »
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?

* Tile_BG_issue.jpg (114.02 KB, 1280x720 - viewed 255 times.)

* OK.00054.jpg (65.38 KB, 1280x720 - viewed 283 times.)
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Patryk Kizny
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Posts: 372



kizny
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« Reply #1 on: August 04, 2015, 03:46:25 PM »
Anyone?
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« Reply #2 on: August 04, 2015, 04:33:47 PM »
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.
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Patryk Kizny
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« Reply #3 on: August 04, 2015, 08:51:28 PM »
vec2 pos = (viewCoord2+vec2(1.0))*0.5;

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