OpenGL: Turn off multiple texture units

opengl textures multitexturing
itun picture itun · Apr 18, 2011 · Viewed 8.1k times · Source

How to turn off multiple texture units because they influence to other render parts. I activate my them:

        glActiveTexture(GL_TEXTURE0 + index);
        glBindTexture(GL_TEXTURE_2D,
               ((MaterialSampler2D)specular).texture.getTOB());
        shader.setTexture2(index);

Is there something like glDeactivateTexture?

Answer

ltjax picture ltjax · Apr 18, 2011

glActiveTexture does not activate texture-units. It merely selects which texture-unit you're currently modifying (yes, OpenGL's object state managing is horrible). You activate textures with glEnable(<texture-target>) and glDisable(<texture-target>). In your case, the target would be GL_TEXTURE_2D.

So to answer your question: Select the texture-unit i by using glActiveTexture(GL_TEXTURE0+i) and then disable it with glDisable(GL_TEXTURE_2D).

Note that all this is redundant with shaders - you can just not access the values there.

Related questions

How to load a bmp on GLUT to use it as a texture?

I've been searching all around for a simple solution to add sprites to my OpenGl GLUT simple moon lander game in c++ and it appears I must use bmp's since they're easiest to load and use them as textures on …

Read More
How to apply texture to glutSolidCube

I can find tutorials about mapping textures to polygons specifying vertices etc. but nothing regarding how to apply a texture to a cube (or other stuff) drawn with glut (glutSolidCube). I am doing something like: glTexEnvfv(GL_TEXTURE_ENV, GL_…

Read More
Multiple textures in GLSL - only one works

My problem is getting more than one texture accessible in a GLSL shader. Here's what I'm doing: Shader: uniform sampler2D sampler0; uniform sampler2D sampler1; uniform float blend; void main( void ) { vec2 coords = gl_TexCoord[0]; vec4 col = texture2D(…

Read More