Glsl shader (C language)

basic.vert
#version 400layout(location =0) in vec3 VertexPosition;layout(location =1) in vec3 VertexColor;out vec3 Color;uniform mat4 Matrix;void main(){    Color= VertexColor;    gl_Position= Matrix *vec4(VertexPosition,1.0);}
Basic. frag
#version 400    in vec3 Color;    out vec4 FragColor;    void main()  {      FragColor = vec4(Color,1.0);  }  


Main Program main. c
# Include
  
   
# Include
   
    
# Include
    
     
# Include "readtext. h" # ifdef _ APPLE __# include
     
      
# Else # define FREEGLUT_STATIC # include
      
       
# Endif # pragma comment (lib ,".. /readtext. lib ") # pragma comment (lib ,".. /glew32.lib ") GLuint vShader, fShader, programHandle; int infologLength = 0; int charsWritten = 0; char * infoLog; // float positionData array [] = {-1.0f, -1.0f, 0.0f, 1.0f,-1.0f, 0.0f, 0.0f, 1.0f, 0.0f}; // color array float colorData [] = {0.2f, 0.8f, 0.0f, 0.4f, 0.6f, 0.0f, 0.1f, 0.9f, 1.0f}; float matrix [16]; matrix [16] = {0.5, 0.0,-0.86 6, 0.0, 0.0, 1.0, 0.0, 0.0, 0.866, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0 }; /// // transformation matrix ///////////////////// //// // cos (angle ), 0,-sin (angle), // column vector // 0, 1, 0, // sin (angle), 0, cos (angle) // GLint matrixLocation; GLuint vaoHandle; // vertex array object void initShader () {char * renderer, * vender, * version, * glslVersion; char * vs, * fs; char * vv, * ff; // check version renderer = glGe TString (GL_RENDERER); vender = glGetString (GL_VENDOR); version = glGetString (GL_VERSION); glslVersion = glGetString (GL_SHADING_LANGUAGE_VERSION); printf ("% s \ n", renderer ); printf ("% s \ n", vender); printf ("% s \ n", version); printf ("% s \ n", glslVersion ); // The Shadow processes vShader = glCreateShader (GL_VERTEX_SHADER); vs = readText (".. /basic. vert "); printf (" % s \ n ", vs); if (vShader = 0) {printf (" fail to cre At vertex shader "); exit (1) ;}// associate source code with the shader vv = vs; glShaderSource (vShader, 1, & vv, NULL ); glCompileShader (vShader); free (vs); // check whether the compilation is successful. glGetShaderiv (vShader, GL_INFO_LOG_LENGTH, & infologLength); if (infologLength> 0) {infoLog = (char *) malloc (infologLength); glGetShaderInfoLog (vShader, infologLength, & charsWritten, infoLog); printf ("% s \ n", infoLog); free (infoLog );} /////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //// // FShader = glCreateShader (GL_FRAGMENT_SHADER ); if (fShader = 0) {printf ("fail to creat shader \ n"); exit (1) ;}fs = readText (".. /basic. frag "); printf (" % s \ n ", fs); ff = fs; glShaderSource (fShader, 1, & ff, NULL); glComp IleShader (fShader); free (fs); // check whether the compilation is successful glGetShaderiv (fShader, GL_INFO_LOG_LENGTH, & infologLength); if (infologLength> 0) {infoLog = (char *) malloc (infologLength); glGetShaderInfoLog (fShader, infologLength, & charsWritten, infoLog); printf ("% s \ n", infoLog); free (infoLog );} //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //// //////////////////////////////////////// ///////// Create the program object programHandle = glCreateProgram (); glAttachShader (programHandle, vShader); glAttachShader (programHandle, fShader); glLinkProgram (programHandle); glGetProgramiv (programHandle, handler, & infologLength); if) {infoLog = (char *) malloc (infologLength); glGetProgramInfoLog (programHandle, infologLength, & charsWritten, I NfoLog); printf ("% s \ n", infoLog); free (infoLog);} glUseProgram (programHandle);} void initVBO () {// Create and populate the buffer objects GLuint vboHandles [2]; GLuint positionBufferHandle, colorBufferHandle; glGenBuffers (2, vboHandles); positionBufferHandle = vboHandles [0]; colorBufferHandle = vboHandles [1]; // bind VBO for glBindBuffer (GL_ARRAY_BUFFER, positionBufferHandle); // load data to VBO glBufferData (GL _ ARRAY_BUFFER, 12 * sizeof (float), positionData, buffers); // bind a VBO to use buffers (GL_ARRAY_BUFFER, colorBufferHandle); // load data to VBO glBufferData (GL_ARRAY_BUFFER, 9 * sizeof (float), colorData, sums); sums (1, & vaoHandle); glBindVertexArray (vaoHandle); glablevertexattribarray (0); // vertex coordinate glablevertexattribarray (1 ); // vertex color // before calling glVertexAttribPointer, You need to bind glBindBuffer (GL_AR RAY_BUFFER, positionBufferHandle); random (0, 3, GL_FLOAT, GL_FALSE, 0, NULL); glBindBuffer (GL_ARRAY_BUFFER, colorBufferHandle); random (1, 3, GL_FLOAT, GL_FALSE, 0, NULL);} void init () {// initialize the glew extension library glewInit (); initShader (); initVBO (); glClearColor (0.0, 0.0, 0.0, 0.0 ); // glShadeModel (GL_SMOOTH);} void display () {glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_TEST); // draw 1 Triangles (using common methods) // glBegin (GL_TRIANGLES); // glColor3f (0.0f, 1.0f, 0.0f); // glVertex3f (0.0f, 1.0f, 0.0f ); // glColor3f (0.0f, 1.0f, 0.0f); // glVertex3f (-1.0f,-1.0f, 0.0f); // glColor3f (0.0f, 0.0f, 1.0f ); // glVertex3f (1.0f,-1.0f, 0.0f); // glEnd (); // use VAO and VBO to draw glBindVertexArray (vaoHandle); glDrawArrays (GL_TRIANGLES ); glBindVertexArray (0); // transfer matrix. MatrixLocation = glGetUniformLocation (programHandle, "Matrix"); glUniformMatrix4fv (matrixLocation, 1, GL_TRUE, matrix); glswapbuffers (); glupostredisplay ();} int main (int argc, char ** argv) {gluinit (& argc, argv); gluinitdisplaymode (glu_double | glu_rgb); gluinitwindowsize (600,600); gluinitwindowposition (100,100); glucreatewindow ("GLSL Test: draw a triangle "); init (); fig (display); fig (); return 0 ;}
      
     
    
   
  
The library used can be downloaded on the my resources page!