Messages

1

Graphics / Re: Sfml multi-textured tile map

« on: August 17, 2015, 05:08:15 pm »

All i need to do is sample the same texture at at-least four different points, so using an offset will do. Using colour channel that gives me 4 different values(uint8 so 0-255) for weights so, four textures.

Tex2pos will be Tex1pos + offset of some kind. etc.


pixel = Tex1Pos * TexWeight.x
pixel += Tex2 Pos * TexWeight.y
...     +=
...     +=


 Is this possible?
 

The tile map will appear smoothly textured as a result, with textures painted according to the weight values which could be a heightmap or any old map.

2

Graphics / Re: Sfml multi-textured tile map

« on: August 17, 2015, 02:54:49 pm »

So that the overlaying textures blend to produce the multi texture effect ?


I was planning on doing it in the shader, hence that line of code which is from a basic texturing pixel shader.
I just don't know how to go about accessing different parts of the texture(atlas) to draw the right part according to the weight information.

3

Graphics / Sfml multi-textured tile map

« on: August 17, 2015, 02:40:33 pm »

How would i do multi texturing in sfml?

Since sf::vertex is set, i would have to use the colour channel to carry the texture weights, and then all i need to do is specify the uv somehow to sample the appropriate texture from the texture 'atlas'.
How would/could i do that?

I don't quite understand "gl_TexCoord[0]" here.

vec4 pixel = texture2D(mapTexture, gl_TexCoord[0].xy);

Any help appreciated.

4

Graphics / Vertex Arrays - Dynamic?

« on: July 09, 2015, 05:18:51 pm »

In dx we have static buffers and dynamic buffers. If you want to make per frame updates to the verts you'd go with the dynamic, is this how it is done with sfml/opengl? I want to reduce draw calls as much as possible and dynamic buffers for the geometry would rock.