glsl编程实例.doc

直接上源码 第一步：在glsl.cpp的同级目录里，新建二个文本文件 第一个取名first.vert，在里面编写顶点着色器，代码如下： void main(){???? gl_Position???? = ftransform();}第二个取名first.frag，在里面编写片元着色器，代码如下： void main(){??? gl_FragColor = vec4(1.0, 1.0, 0.0, 1.0);}以上两个是最简单的着色器代码，把片元设成黄色 第二步：将下面这段程序添加到上次新建好的glsl.cpp #include stdafx.h //包含GLSL所需的头文件 #include glut.h#include glext.h static GLuint vertShader;?? //顶点着色器对象static GLuint fragShader;?? //片元着色器对象static GLuint glslProgram;?? //程序对象 PFNGLATTACHSHADERPROC glAttachShader;PFNGLSHADERSOURCEPROC glShaderSource;PFNGLCOMPILESHADERPROC glCompileShader;PFNGLCREATEPROGRAMPROC glCreateProgram;PFNGLCREATESHADERPROC glCreateShader;PFNGLLINKPROGRAMPROC glLinkProgram;PFNGLUSEPROGRAMPROC glUseProgram;PFNGLGETSHADERIVPROC glGetShaderiv;PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;PFNGLGETPROGRAMIVPROC glGetProgramiv;PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog; //读入着色器代码int readShaderSource(GLuint shader, const char *file){FILE *fp;const GLchar *source;GLsizei length;int ret; glShaderSource = (PFNGLSHADERSOURCEPROC)wglGetProcAddress(glShaderSource); fp = fopen(file, rb);if (fp == NULL) {?? perror(file);?? return -1;} fseek(fp, 0L, SEEK_END);length = ftell(fp); source = (GLchar *)malloc(length);if (source == NULL) {?? fprintf(stderr, Could not allocate read buffer.\n);?? return -1;} fseek(fp, 0L, SEEK_SET);ret = fread((void *)source, 1, length, fp) != (size_t)length;fclose(fp); if (ret)?? fprintf(stderr, Could not read file: %s.\n, file);else?? glShaderSource(shader, 1, source, length); free((void *)source); return ret;} //输出着色器LOGvoid printShaderInfoLog(GLuint shader){GLsizei bufSize;GLchar *infoLog;GLsizei length;glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)wglGetProcAddress(glGetShaderInfoLog); glGetShaderiv(shader, GL_INFO_LOG_LENGTH , bufSize);if (bufSize 0) {?? infoLog = (GLchar *)malloc(bufSize);?? if (infoLog != NULL) {??? glGetShaderInfoLog(shader, bufSize, length, infoLog);??? printf(%s\n, infoLog);??? free(infoLog);