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  Shaders and JOGL  (Read 3071 times)
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Offline a6767

Senior Newbie





« Posted 2007-08-01 20:14:51 »

I'm implementing shaders with glsl in my JOGL applet. Everything works fine, except textures. If I try to access to texture 1 (With MultiTexture activated) , my program access to texture 0. I pass the unit of texture as a uniform to texture2D function. There is no way to say to my fragment shader which texture I need to view.

The fragment shader is very simple:

uniform sampler2D colorMap;
uniform sampler2D envMap;
void main()
{
  vec4 color = texture2D(colorMap,gl_TexCoord[0].st);
  vec4 env = texture2D(envMap,gl_TexCoord[1].st);
  gl_FragColor=color+env*0.4;
}

It gets colorMap=0, envMap=0 . I believe this, because it applies as colorMap texture0 and as envMap texture0
Offline a6767

Senior Newbie





« Reply #1 - Posted 2007-08-01 20:42:06 »

I answer myself. Before calling glUniform you must call glActiveProgram
Offline gouessej
« Reply #2 - Posted 2007-08-03 11:29:21 »

Could you give me an example of shader to handle Phong model with textures please?

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Offline lhkbob

JGO Knight


Medals: 32



« Reply #3 - Posted 2007-08-03 14:09:53 »

It shouldn't be that hard to find a Phong implementation on the web and just add some texturing support.  I would think all you need to do is calculate the phong lighting from before and then modulate it with the textures.

Offline a6767

Senior Newbie





« Reply #4 - Posted 2007-08-06 06:39:13 »

gouessej, I haven't one. But there are many samples in the web. In any case, it is not hard to implement one.

Take a look at these tuts

http://www.lighthouse3d.com/opengl/glsl/index.php?ogldir2

http://www.ozone3d.net/tutorials/glsl_lighting_phong.php
Offline gouessej
« Reply #5 - Posted 2007-08-08 11:34:37 »

gouessej, I haven't one. But there are many samples in the web. In any case, it is not hard to implement one.

Take a look at these tuts

http://www.lighthouse3d.com/opengl/glsl/index.php?ogldir2

http://www.ozone3d.net/tutorials/glsl_lighting_phong.php

Thanks but the main difficulty is to adapt it to handle the textures.

Offline trbabb

Junior Newbie





« Reply #6 - Posted 2007-08-08 21:32:02 »

So, the lambertian term should be between 0 and 1. Multiply that value by the R, G, B sample you get from the texture. Then add the ambient to it. Then add the specular to it. Really, not difficult.
Offline gouessej
« Reply #7 - Posted 2007-08-13 11:43:04 »

So, the lambertian term should be between 0 and 1. Multiply that value by the R, G, B sample you get from the texture. Then add the ambient to it. Then add the specular to it. Really, not difficult.
Ok thank you very much. I'm a newbie in GLSL, sorry.

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