首先生成纹理索引

GLuint textures[] = { -1, -1 };
glGenTextures(2, textures);

glGenTextures第一个参数是生成texture索引的个数,第二个是索引的指针.

通过生成索引之后会发现textures的值变成{1,2}

//绑定纹理
	glBindTexture(GL_TEXTURE_2D, textures[0]); 
	// Set the texture wrapping parameters
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);	// Set texture wrapping to GL_REPEAT (usually basic wrapping method)
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	// Set texture filtering parameters  
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	
	int width, height;
	unsigned char* image = SOIL_load_image("textures/container.jpg", &width, &height, 0, SOIL_LOAD_RGB);
	//openGL是个状态机 直接把数据传给已经绑定的纹理
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
	//生成MipMap
	glGenerateMipmap(GL_TEXTURE_2D);
	SOIL_free_image_data(image);
	//解除绑定
	glBindTexture(GL_TEXTURE_2D, 0); 

通过glUniform1i函数把纹理传给片段着色器

ourShader.Use();
		// Bind Textures using texture units
		glActiveTexture(GL_TEXTURE0);
		glBindTexture(GL_TEXTURE_2D, textures[0]);
		glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture1"), 0);
		glActiveTexture(GL_TEXTURE1);
		glBindTexture(GL_TEXTURE_2D, textures[1]);
		glUniform1i(glGetUniformLocation(ourShader.Program, "ourTexture2"), 1);