/// Inlcudes

 #include "MicroGlut.h"

 #include "GL_utilities.h"
 
 
 /// Defines
 #define ARRAY_COUNT(ARRAY) (sizeof(ARRAY)/sizeof(*(ARRAY)))

 
 /// Globals
 GLuint  vertexArray;
 GLfloat positions[] =

 {

     -0.5f, -0.5f, 0.0f,
     -0.5f, +0.5f, 0.0f,
     +0.5f, -0.5f, 0.0f,

 };
 
 

 /// Init

 void init(void)
 {

     // GL inits.
     glClearColor(0.2, 0.2, 0.5, 0.0);
     glDisable(GL_DEPTH_TEST);
     printError("init GL");
 
     // Load and compile shader.
     GLuint program = loadShaders("tsbk07.vert", "tsbk07.frag");
     printError("init shader");
 
     // Allocate and activate Vertex Array Object (VAO), used for uploading
     // the geometry.
     glGenVertexArrays(1, &vertexArray);
     glBindVertexArray(vertexArray);
 
     // Allocate and activate Vertex Buffer Objects (VBO), for vertex data.
     GLint  positionLocation = glGetAttribLocation(program, "inPosition");
     GLuint positionBuffer;
     glGenBuffers(1, &positionBuffer);
     glBindBuffer(GL_ARRAY_BUFFER, positionBuffer);
     glBufferData(GL_ARRAY_BUFFER, sizeof(positions), positions, GL_STATIC_DRAW);
     glVertexAttribPointer(positionLocation, 3, GL_FLOAT, GL_FALSE, 0, 0);
     glEnableVertexAttribArray(positionLocation);
     printError("init VBOs");

 }
 
 

 /// Display

 void display(void)
 {

     // Clear the screen.
     glClear(GL_COLOR_BUFFER_BIT);

     // Select VAO.
     glBindVertexArray(vertexArray);

     // Draw.
     glDrawArrays(GL_TRIANGLES, 0, ARRAY_COUNT(positions)/3);
     printError("display draw");

     // Show on the screen.
     glutSwapBuffers();

 }
 

 
 /// Main
 int main(int argc, char * argv[])

 {

     glutInit(&argc, argv);
     glutInitContextVersion(3, 2);
     glutInitWindowSize(600, 600);
     glutCreateWindow("TSBK07");

     glutDisplayFunc(display);

     dumpInfo();
     init();
     glutMainLoop();

 }