用着色器编写第一个程序

来源：互联网发布：淘宝有什么推广方式编辑：程序博客网时间：2024/06/05 02:34
我们用着色编写画一个三角形
#include<Gl/glew.h>//#include<gl/glxew.h>#include<Gl/gl.h>#include<GL/GLU.h>#include<Gl/glut.h>#include<stdio.h>#include<malloc.h>#include<glm/glm.hpp>#include<glm/gtc/matrix_transform.hpp>#include<glm/gtx/transform.hpp>using  glm::vec3;using  glm::vec4;void render(){GLenum err = glewInit();if (GLEW_OK != err)fprintf(stderr, "error initializaing GLew %s\n", glewGetErrorString(err));GLuint vertShader = glCreateShader(GL_VERTEX_SHADER);const GLchar *codearray[] = {"#version 430                      \n""in vec3 VertexPosition;        \n""in vec3 VertexColor;             \n""out vec3 Color ;\n"" void main()                   \n""{                                \n""Color = VertexColor;                  \n""gl_Position = vec4(VertexPosition, 1.0);           \n""}              \n"};glShaderSource(vertShader, 1, codearray, NULL);glCompileShader(vertShader);GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);const GLchar* codearray_frag[] = {"#version    430                         \n""in vec3 Color;                         \n""out vec4 FragColor;                    \n""void  main()                           \n""{                                      \n""FragColor=vec4(Color,1.0);             \n""}                                      \n"};glShaderSource(fragShader, 1, codearray_frag, NULL);glCompileShader(fragShader);GLuint programHandle = glCreateProgram();if (0 == programHandle){fprintf(stderr, "error creating program \n");exit(0);}glAttachShader(programHandle, vertShader);glAttachShader(programHandle, fragShader);glBindAttribLocation(programHandle, 0, "VertexPosition");glBindAttribLocation(programHandle, 1, "VertexColor");GLuint vaoHandle;float positionData[] = {-0.8f, -0.8f, 0.0f,0.8f, -0.8f, 0.0f,0.0f, 0.8f, 0.0f};float colorData[] = {1.0f, 0.0f, 0.0f,0.0f, 1.0f, 0.0f,0.f, 0.0f, 1.0f};GLuint vboHandle[2];glGenBuffers(2, vboHandle);GLuint positionbufferHandle = vboHandle[0];GLuint colorBufferHandle = vboHandle[1];glBindBuffer(GL_ARRAY_BUFFER, positionbufferHandle);glBufferData(GL_ARRAY_BUFFER, 9 * sizeof(float), positionData, GL_STATIC_DRAW);glBindBuffer(GL_ARRAY_BUFFER, colorBufferHandle);glBufferData(GL_ARRAY_BUFFER, 9 * sizeof(float), colorData, GL_STATIC_DRAW);glGenVertexArrays(1, &vaoHandle);glBindVertexArray(vaoHandle);glEnableVertexAttribArray(0);glEnableVertexAttribArray(1);glBindBuffer(GL_ARRAY_BUFFER, positionbufferHandle);glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (GLubyte*)NULL);glBindBuffer(GL_ARRAY_BUFFER, colorBufferHandle);glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (GLubyte*)NULL);glBindVertexArray(vaoHandle);//glDrawArraysglDrawArrays(GL_TRIANGLES, 0, 3);glLinkProgram(programHandle);GLint result;glGetShaderiv(programHandle, GL_COMPILE_STATUS, &result);if (GL_FALSE == result){fprintf(stderr, "vertex shader compilation failed\n");GLint loglen;glGetProgramiv(programHandle, GL_LINK_STATUS, &loglen);if (loglen > 0){char*log = (char*)malloc(loglen);GLsizei written;glGetProgramInfoLog(programHandle, loglen, &written, log);fprintf(stderr, "shader log:%s\n", log);free(log);}}else{;//glUseProgram(programHandle);}glUseProgram(programHandle);/*constGLubyte*renderer = glGetString(GL_RENDER);constGLubyte *vendor = glGetString(GL_VENDOR);constGLubyte *version = glGetString(GL_VERSION);constGLubyte *glslVersion = glGetString(GL_SHADING_LANGUAGE_VERSION);GLint major, minor;glGetIntegerv(GL_MAJOR_VERSION, &major);glGetIntegerv(GL_MINOR_VERSION, &minor);printf("GL vendor:%s\n", vendor);printf("GL renderer:%s\n", renderer);printf("GL version(s):%s\n", version);printf("GL version(d):%d,%d\n", major,minor);printf("GL version:%s\n", glslVersion);*/;}int main(int argc, char**argv){glutInit(&argc, argv);glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);glutCreateWindow("ss");glutDisplayFunc(render);glutMainLoop();return 0;//vec3 VertexPosition = vec3(1, 0,  1.0f);//vec3 VertexColor = vec3(1.0f, 0, 0);//return 0;}
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