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DerTherion

OpenGL multi texturing question

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hello, i play with the multi texture in opengl/jogl my question is, is it possible(without use of shaders) to get any kind of texture noise when combine textures & states (like bump / displacement mapping or something) in multi texturing? // the texture bump is a grayscale bumpmap picture gl.glActiveTexture(GL.GL_TEXTURE0); gl.glEnable(GL.GL_TEXTURE_2D); texture[bump].bind(); //bind first texture /* gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_COMBINE); gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_COMBINE_RGB, GL.GL_DOT3_RGBA); gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_SOURCE0_RGB, GL.GL_TEXTURE); gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_SOURCE1_RGB, GL.GL_PREVIOUS); */ gl.glTexEnvf (GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_COMBINE); gl.glTexEnvf (GL.GL_TEXTURE_ENV, GL.GL_COMBINE_RGB, GL.GL_DOT3_RGBA); gl.glActiveTexture(GL.GL_TEXTURE1); gl.glEnable(GL.GL_TEXTURE_2D); texture[1].bind(); //bind secondary texture gl.glTexEnvf (GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_COMBINE); gl.glTexEnvf (GL.GL_TEXTURE_ENV, GL.GL_COMBINE_RGB, GL.GL_ADD);

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If you are going to combine 2 textures and generate noise, you could use 2 textures that already contain noise and just GL_MODULATE them.

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bump / displacement* mapping takes place only in the shader, so no.

*) if you set up your mesh right, you could modify it as your drawing based on a offset, but this would be a pain and slower then a shader, dont do it.

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