加载多张纹理时,需要在FragmentShader文本中采用多个采样器,将多个纹理进行混合,OpenGL有多个采样器,至少16个,编号分别为数字GL_TEXTURE0,GL_TEXTURE1,... #version 330 core...uniform sampler2D texture1;uniform sampler2D texture2;voidmain(){FragColor =mix(texture(texture1, TexCoord),texture(texture2, Tex...
they read data directly from a texture. The glGetTexImage() function reads from the texture currently bound to target, whereas glGetTextureImage() reads from the texture whose name you give in texture. Note that glGetTextureImage() has an additionalparameter—bufSize—which contains...
unsigned char* data = stbi_load("container.jpg",&width,&height,&nrChannels,0);//载入图像,宽度、高度和颜色通道的个数 if (data) { glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);//生成贴图 glGenerateMipmap(GL_TEXTURE_2D);//生成多级纹理 }...
glGetShaderiv(shader, GL_COMPILE_STATUS,&success);if(!success) { glGetShaderInfoLog(shader,1024, NULL, infoLog); std::cout<<"ERROR::SHADER_COMPILATION_ERROR of type:"<< type <<"\n"<< infoLog <<"\n -- --- --"<<std::endl; } }else{ glGetProgramiv(shader, GL_LINK_STATUS,&su...
注意点:Attributes不能够直接传递给Fragment Shader,如果需要传递给Fragment Shader,则需要通过Vertex Shader间接的传递过去。而Unifrom和Texture Data可以直接传递给Vertex Shader和Fragment Shader,具体怎么传递,依需求而定。 3.1.5 如何使用OpenGL来绘制一张图片 ...
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 5,多级渐远纹理(Mipmap) 假如一个包含着上千物体的大房间,每个物体上都有纹理;有些物体会很远,但其纹理会拥有与近处物体同样高的分辨率;由于远处的物体可能只产生很少的片段,OpenGL从高分辨率纹理中为这些片段获取正确的颜色值会很困难;因为它...
glBindTexture(GL_TEXTURE_2D, tex); std::cout << glGetError() << std::endl; // returns 0 (no error) glTexImage2D(GL_TEXTURE_3D, 0, GL_RGB, 512, 512, 0, GL_RGB, GL_UNSIGNED_BYTE, data); std::cout << glGetError() << std::endl; // returns 1280 (invalid enum) glGen...
参数type解释参数*pixels指向的诗句,它告诉OpenGL使用缓冲区中的什么数据类型来存储颜色分量。如下表: 像素数据的数据类型 常量 描述 GL_UNSIGNED_BYTE 每种颜色分量都是一个8位无符号整数 GL_BYTE 8位有符号整数 GL_UNSIGNED_SHORT 16位无符号整数 GL_SHORT 16位有符号整数 ...
glBindTexture(GL_TEXTURE_2D,tex);std::cout<<glGetError()<<std::endl;// 返回 0 (无错误)glTexImage2D(GL_TEXTURE_3D,0,GL_RGB,512,512,0,GL_RGB,GL_UNSIGNED_BYTE,data);std::cout<<glGetError()<<std::endl;// 返回 1280 (非法枚举)glGenTextures(-5,textures);std::cout<<glGetError...
unsigned int TextureFromFile(const char *path, const string &directory) { string filename = string(path); filename = directory + '/' + filename; unsigned int textureID; glGenTextures(1, &textureID); unsigned char *data = nullptr; LOGCATE("TextureFromFile Loading texture %s", filename...