glslang multitexturing
Author
hi.
how do I specify which texture unit ( TEXTURE0_ARB, TEXTURE1_ARB, ... ) to use during glsl process?
if i simply define a texture sampler by "uniform sampler2D s;" the first texture unit is used. how can i reference to another texture unit?
thanks in advance
just set the sampler to the texture unit number you want to use via the set uniform function (0 = texunit 0, 1 = texunit 1 etc) and then use them in the GLSL code.
Hello!
in the fragment shader you have to define sampler2D-s like this:
uniform sampler2D basetexture;
uniform sampler2D bumptexture;
From the opengl code:
gl.glUseProgramObjectARB( normalShaderObj );
int baseTexture = gl.glGetUniformLocationARB( normalShaderObj, "basetexture".getBytes() );
gl.glUniform1iARB( baseTexture, 0 ); // 0 is GL.GL_TEXTURE0_ARB
int bumpTexture = gl.glGetUniformLocationARB( normalShaderObj, "bumptexture".getBytes() );
gl.glUniform1iARB( bumpTexture, 1 ); // 1 is GL.GL_TEXTURE1_ARB
Hopefully, this might help.
in the fragment shader you have to define sampler2D-s like this:
uniform sampler2D basetexture;
uniform sampler2D bumptexture;
From the opengl code:
gl.glUseProgramObjectARB( normalShaderObj );
int baseTexture = gl.glGetUniformLocationARB( normalShaderObj, "basetexture".getBytes() );
gl.glUniform1iARB( baseTexture, 0 ); // 0 is GL.GL_TEXTURE0_ARB
int bumpTexture = gl.glGetUniformLocationARB( normalShaderObj, "bumptexture".getBytes() );
gl.glUniform1iARB( bumpTexture, 1 ); // 1 is GL.GL_TEXTURE1_ARB
Hopefully, this might help.
note: the above code is C#, so some of that stuff isnt required when dealing with C++
@fazekaim
when posting code can you please use the source or code tags, see the forum FAQ for details (top right icon)
@fazekaim
when posting code can you please use the source or code tags, see the forum FAQ for details (top right icon)
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