How can I read from multiple textures in an OpenGL ES 2 shader?
- by Peyman Tahghighi
How can I enable more than one texture in OpenGL ES 2 so that I can sample from all of them in my shader? For example, I'm trying to read from two different textures in my shader for the player's car.
This is how I'm currently dealing with the texture for my car:
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, this->texture2DObj);
glUniform1i(1, 0);
glBindBuffer(GL_ARRAY_BUFFER, this->vertexBuffer);
glEnableVertexAttribArray(0);
int offset = 0;
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, this->vertexBufferSize,(const void *)offset);
offset += 3 * sizeof(GLfloat);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, this->vertexBufferSize, (const void*)offset);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->indexBuffer);
glDrawElements(GL_TRIANGLES, this->indexBufferSize, GL_UNSIGNED_SHORT, 0);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
