GLSL perspective matrix (c)

Perspective. vert

#version 330layout(location =0) in vec4 vertexPosition;layout(location =1) in vec4 vertexColor;smooth out vec4 theColor;uniform vec2 offset;uniform mat4 perspectiveMatrix;void main(){vec4 cameraPosition =vertexPosition +vec4(offset.x, offset.y, 0.0, 0.0);gl_Position =perspectiveMatrix *cameraPosition;theColor =vertexColor;}

Perspective. frag

#version 330smooth in vec4 theColor;out vec4 outputColor;void main(){outputColor =theColor;}

Perspective. c

//////////////////////////////////////// //// // View version 2: matrix implementation. // Call the library vmath // Author: blue silk cream ////////////////////////////////////// /// // # include
 
  
# Include
  
   
# Include
   
    
# Include "readtext. h" # include "vmath. h" # ifdef _ APPLE _ # include
    
     
# Else # define FREEGLUT_STATIC # include
     
      
# Endif # pragma comment (lib, "readtext. lib ") # pragma comment (lib," vmath. lib ") int I; GLuint vShader, fShader, programHandle; GLint vaoHandle, vboHandles [2], callback, colorBufferHandle; Matrix44f M; // projection matrix GLint handler; //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// /// //////////////////////////////////////// //// // Int infoLogLength = 0; int charWritten = 0; char * infoLog; //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// /// // float positionData [] = {0.25f, 0.25f,-1.25f, 1.0f, 0.25f,-0.25f,-1.25f, 1.0f,-0.25f, 0.25f,-1.25f, 1.0 F, 0.25f,-0.25f,-1.25f, 1.0f,-0.25f,-0.25f,-1.25f, 1.0f,-0.25f, 0.25f,-1.25f, 1.0f, 0.25f, 0.25f,-2.75f, 1.0f,-0.25f, 0.25f,-2.75f, 1.0f, 0.25f,-0.25f,-2.75f, 1.0f, 0.25f,-0.25f,-2.75f, 1.0f,-0.25f, 0.25f,-2.75f, 1.0f,-0.25f,-0.25f,-2.75f, 1.0f,-0.25f, 0.25f,-1.25f, 1.0f,-0.25f,-0.25f,-1.25f, 1.0f,-0.25f,-0.25f, -2.75f, 1.0f,-0.25f, 0.25f,-1.25f, 1.0f,-0.25f,-0.25f,-2.75f, 1.0 F,-0.25f, 0.25f,-2.75f, 1.0f, 0.25f, 0.25f,-1.25f, 1.0f, 0.25f,-0.25f,-2.75f, 1.0f, 0.25f,-0.25f,-1.25f, 1.0f, 0.25f, 0.25f,-1.25f, 1.0f, 0.25f, 0.25f,-2.75f, 1.0f, 0.25f,-0.25f,-2.75f, 1.0f, 0.25f, 0.25f,-2.75f, 1.0f, 0.25f, 0.25f,-1.25f, 1.0f,-0.25f, 0.25f,-1.25f, 1.0f, 0.25f, 0.25f,-2.75f, 1.0f,-0.25f, 0.25f,-1.25f, 1.0f, -0.25f, 0.25f,-2.75f, 1.0f, 0.25f,-0.25f,-2.75f, 1.0f,-0. 25f,-0.25f,-1.25f, 1.0f, 0.25f,-0.25f,-1.25f, 1.0f, 0.25f,-0.25f,-2.75f, 1.0f,-0.25f,-0.25f,-2.75f, 1.0f,-0.25f,-0.25f,-1.25f, 1.0f}; float colorData [] = {0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.8f, 0.8f, 0.8f, 1.0f, 0.8f, large, 0.8f, 1.0f, 0.8f, 0.8f, 0.8f, 1.0f, 0.8f, 0.8f, 0.8f, 1.0f, 0.8f, Hangzhou, 0.8f, 1.0f, 0.8f, 0.8f, 0.8f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.5f, 0.5f, 0.0f, 1.0f, 0.5f, 0.5f, 0.0f, 1.0f, 0.5f, 0.5f, 0.0f, 1.0f, 0.5f, 0.5f, 0.0f, 1.0f, 0.5f, 0.5f, 0.0f, 1.0f, 0.5f, 0.5f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0 F, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f }; //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //// // void SetupShader () {char * render Er; char * vender; char * version; char * glslVersion; // char *, * fs; char * vv, * ff; // renderer = glGetString (GL_RENDERER ); vender = glGetString (GL_VENDOR); version = glGetString (GL_VERSION); glslVersion = glGetString (GL_SHADING_LANGUAGE_VERSION ); printf ("************************************* * *************** \ n "); printf ("graphic card: \ t % s \ n", renderer); printf ("graphic comp Any: \ t % s \ n ", vender); printf (" openGL version: \ t % s \ n ", version); printf (" GLSL version: \ t % s \ n ", glslVersion ); printf ("************************************* * *************** \ n "); //////////////////////////////////////// /// // vShader = glCreateShader (GL_VERTEX_SHADER ); vs = readText ("shader/perspective. 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/perspective. 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 (); histogram (programHandle, vShader); glAttachShader (programHandle, fShader); glLinkProgram (programHandle); glUseProgram (programHandle); iterator (programHandle, iterator, & infoLogLength); if (inf OLogLength> 0) {infoLog = (char *) malloc (infoLogLength); glGetProgramInfoLog (programHandle, infoLogLength, & charWritten, infoLog); printf ("% s \ n", infoLog ); printf ("************************************* * ******************* \ n "); free (infoLog) ;}} void InitVBO () {glGenBuffers (2, vboHandles); positionBufferHandle = vboHandles [0]; colorBufferHandle = vboHandles [1]; //////////////////////////////////////// /// glBindB Uffer (random, positionBufferHandle); glBufferData (random, sizeof (positionData), positionData, random); random (random, colorBufferHandle); glBufferData (random, sizeof (colorData), colorData, GL_STATIC_DRAW ); //////////////////////////////////////// /glGenVertexArrays (1, & vaoHandle); glBindVertexArray (vaoHandle ); /// // EVertexAttribArray (0); Round (1); Round (GL_ARRAY_BUFFER, positionBufferHandle); Round (0, 4, GL_FLOAT, GL_FALSE, 0, NULL); Round (GL_ARRAY_BUFFER, colorBufferHandle ); glVertexAttribPointer (1, 4, GL_FLOAT, GL_FALSE, 0, NULL );} //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// ///////////// // Void SetupRC () {glewInit (); SetupShader (); InitVBO (); glClearColor (1.0, 0.0, 0.0, 1.0 ); //////////////////////////////////////// glable (GL_CULL_FACE ); glCullFace (GL_BACK); glFrontFace (GL_CW );} //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// //////////////////////////////////////// /// // glGet ** Location () series functions must be used after glLinkProgram. Note! // Do not convert the floating point value in shaderzhong. //////////////////////////////////////// ///// Void RenderScene () {glClear (callback); glUseProgram (programHandle); offsetUniformLocation = glGetUniformLocation (programHandle, "offset"); response = glGetUniformLocation (programHandle, "Callback"); terminate (M,-1.0, 1.0, 1.0,-1.0, 1.0, 3.0); // calculation matrix MglUniform2f (offsetUniformLocation, 0.5, 0.5); // change it to 0.0, 0.0, only a square shape is displayed, and the perspective effect is invisible. Vertex (vertex, 1, GL_TRUE, M); glBindVertexArray (vaoHandle); glDrawArrays (GL_TRIANGLES, 0, 36); glBindVertexArray (0); fig ();} void keyBoard (unsigned char key, int x, int y) {if (key = fig) exit (0);} int main (int argc, char * argv []) {gluinit (& argc, argv); gluinitdisplaymode (FIG); gluinitwindowsize (800,600); gluinitwindowposition (0, 0); glucreatewindow ("fourth: perspective "); setupRC (); fig (RenderScene); fig (keyBoard); fig (); return 0 ;}
     
    
   
  
 

Vmath can be downloaded from my resources