GLSL变换颜色的三角形(C语言)

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////////////////////////////////////////////////////////////////////////////////////////移动三角形 颜色变换//作者：青丝成霜//////////////////////////////////////////////////////////////////////////////////////#include <stdio.h>#include <stdlib.h>#include <GL/glew.h>#include "readtext.h"#ifdef _APPLE_#include <glut/glut.h>#else#define FREEGLUT_STATIC#include <GL/glut.h>#endif#pragma  comment(lib, "readtext.lib")GLuint vShader, fShader, programHandle;GLint  vaoHandle, vboHandles[2], positionBufferHandle, colorBufferHandle;GLuint elapseTimeUniformLocation, loopDurationLocation, fragLoopDurationLocation;GLint positionLocation, colorLocation;////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////int infoLogLength =0;int charWritten =0;char *infoLog;///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////float positionData[]={  0.8f, 0.0f, 0.0f,                        -0.8f, 0.0f, 0.0f,     0.0f, 0.8f, 0.0f};////////////////////////////////////////////float colorData[]= { 1.0, 0.0, 0.0,//                     0.0, 1.0, 0.0,//   0.0, 0.0, 1.0};//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////void SetupShader(){char *renderer;char *vender;char *version;char *glslVersion;////////////////////////////////////char *vs, *fs;char *vv, *ff;char *txt;/////////////////////////////////////////////////////////////renderer =glGetString(GL_RENDERER);vender =glGetString(GL_VENDOR);version =glGetString(GL_VERSION);glslVersion =glGetString(GL_SHADING_LANGUAGE_VERSION);printf("graphic card:\t%s \n", renderer);printf("graphic company:\t%s \n", vender);printf("openGL version:\t%s \n", version);printf("GLSL version:\t %s \n", glslVersion);printf("*****************************************************\n");//////////////////////////////////////////////////////////////    //txt =readText("2.txt");//printf("%s\n",txt);//putchar(10);vShader =glCreateShader(GL_VERTEX_SHADER);vs =readText("shader/triangle.vert");//printf("%s\n",vs);vv =vs;if(vShader ==0){printf("Error: fail to create shader!");exit(1);}glShaderSource(vShader, 1, &vv, NULL);glCompileShader(vShader);free(vs);glGetShaderiv(vShader, GL_INFO_LOG_LENGTH, &infoLogLength);if(infoLogLength >0){infoLog =(char *)malloc(infoLogLength);glGetShaderInfoLog(vShader, infoLogLength, &charWritten, infoLog);printf("%s\n", infoLog);printf("**********************************************************\n");free(infoLog);}/////////////////////////////////////////////////////////////////////////////////fShader =glCreateShader(GL_FRAGMENT_SHADER);if(fShader ==0){printf("can't create fragment shader! \n");exit(1);}    fs =readText("shader/triangle.frag");    //printf("%s \n",fs);ff= fs;glShaderSource(fShader, 1, &ff, NULL);glCompileShader(fShader);free(fs);glGetShaderiv(fShader, GL_INFO_LOG_LENGTH, &infoLogLength);if(infoLogLength >0){infoLog =(char *)malloc(infoLogLength);glGetShaderInfoLog(fShader, infoLogLength, &charWritten, infoLog);////////charWritten is printf("%s \n",infoLog);printf("***********************************************************\n");free(infoLog);}//////////////////////////////////////////////////////////////////////////programHandle =glCreateProgram();glAttachShader(programHandle, vShader);glAttachShader(programHandle, fShader);glLinkProgram(programHandle);glGetProgramiv(programHandle, GL_INFO_LOG_LENGTH, &infoLogLength);if(infoLogLength >0){infoLog =(char *)malloc(infoLogLength);glGetProgramInfoLog(programHandle, infoLogLength, &charWritten, infoLog);printf("%s \n", infoLog);printf("**************************************************************************\n");free(infoLog);}glUseProgram(programHandle);}//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////void InitVBO(){glGenBuffers(2, vboHandles);positionBufferHandle =vboHandles[0];//colorBufferHandle =vboHandles[1];    //////////////////////////////////////glBindBuffer(GL_ARRAY_BUFFER, positionBufferHandle);glBufferData(GL_ARRAY_BUFFER, sizeof(positionData), positionData,GL_STATIC_DRAW);//glBindBuffer(GL_ARRAY_BUFFER, colorBufferHandle);//glBufferData(GL_ARRAY_BUFFER, sizeof(colorData), 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, NULL);//glBindBuffer(GL_ARRAY_BUFFER, colorBufferHandle);//glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, NULL);}///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////void SetupRC(){glewInit();SetupShader();InitVBO();glClearColor(1.0, 0.0, 0.0, 1.0);}////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////void RenderScene(){glClear(GL_COLOR_BUFFER_BIT );glBindVertexArray(vaoHandle);glDrawArrays(GL_TRIANGLES, 0, 3);glBindVertexArray(0);elapseTimeUniformLocation =glGetUniformLocation(programHandle, "time");fragLoopDurationLocation =glGetUniformLocation(programHandle,"fragLoopDuration");    loopDurationLocation =glGetUniformLocation(programHandle, "loopDuration");//printf("%d\t%d\t",elapseTimeUniformLocation, loopDurationLocation);glUniform1f(loopDurationLocation, 5.0f);glUniform1f(fragLoopDurationLocation, 10.0f);glUniform1f(elapseTimeUniformLocation, glutGet(GLUT_ELAPSED_TIME)/1000.0f );glutSwapBuffers();glutPostRedisplay();}///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////int main(int argc, char *argv[]){glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);glutInitWindowSize(800, 600);glutInitWindowPosition(0,0);glutCreateWindow("second triangle:active!");SetupRC();glutDisplayFunc(RenderScene);glutMainLoop();return 0;}

triangle.vert

#version 400layout(location =0) in vec3 vertexPosition;uniform float loopDuration;uniform float time;void main(){float timeScale = 3.14159f * 2.0f / loopDuration;float currTime = mod(time, loopDuration);vec4 totalOffset = vec4(cos(currTime * timeScale) * 0.5f,sin(currTime * timeScale) * 0.5f, 0.0f,0.0f);gl_Position = vec4(vertexPosition,1.0) + totalOffset;}

triangle.frag

#version 400out vec4 fragColor;uniform float fragLoopDuration;uniform float time;const vec4 firstColor =vec4(1.0f, 0.0f, 0.0f, 1.0f);const vec4 secondColor =vec4(0.0f, 1.0f, 0.0f, 1.0f);void main(){float currentTime =mod(time, fragLoopDuration);float currentLerp =currentTime/fragLoopDuration;fragColor =mix(firstColor, secondColor, currentLerp); }

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