Different textures

OpenGL
1

… i want to used two different textures in my fragment shader … seems to be no problem with texture2D() … but it doesn’t work …
i’m loading my textures and bind them … i thought i have to use the texturename in my fragment shader as sampler2d value … but looks like it isn’t the right way …

GLuint a = 0;
GLuint b = 0;

char nameA[256] = “bla”
char nameB[256] = “blubb”

Image ta, tb;

imgLoadImage( ta, nameA);
imgLoadImage( tb, nameB);

glGenTextures( 1, &a);
glTexParameteri( …
… and all the other texture stuff …

glGenTextures( 1, &b);
… same as a …

and now i want to use them both in my shader …

loc = glGetUniformLocationARB(*shaderProgam, “baseImage”);
glUniform2fvARB( loc, 1, &a);

loc = glGetUniformLocationARB(*shaderProgam, “shadowMap”);
glUniform2fvARB( loc, 1, &b);

… but this doesn’t work … perhaps i didn’t really understood the meaning of an texture unit … ist it similar to the texture name or discribes it a part of an multitexture???

2

You don’t pass the texture object to the GL, you pass the texture unit to the GL:

unsigned int tex;

//Texture generation
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexData2D(GL_TEXTURE_2D, ...);

//Rendering
glActiveTexture(GL_TEXTURE0 + i);
glBindTexture(GL_TEXTURE_2D, tex);
glUniform1i(glGetUniformLocation("my_texture"), i);
3

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