#include <GLShaderManager.h>
#include <GLTools.h>
#include <glut/glut.h>
GLBatch triangleBatch;
GLShaderManager shaderManager;
// the window size changes to accept the new width and height, where 0,0 represent the lower-left coordinates of the viewport in the window, w, h represent pixels
void ChangeSize(int w,int h)
{
GlViewport (0, 0, w, h);
}
// Make a one-time setup for the program
void SetupRC()
{
// Set the background color
GlClearColor (0.0 f, f, 0.0 1.0 f, 1.0 f);
// Initialize the shader manager
shaderManager.InitializeStockShaders();
// Set the triangle, where the array vVert contains x,y, cartesian pairs of all 3 vertices.
GLfloat vVerts[] = {
0.5 f, f 0.0, 0.0, f
0.5 f, f 0.0, 0.0 f,
0.0 f, f 0.5, 0.0 f,
};
// batch processing
triangleBatch.Begin(GL_TRIANGLES,3);
triangleBatch.CopyVertexData3f(vVerts);
triangleBatch.End();
}
// Start rendering
void RenderScene(void)
{
// Clear a specific buffer or group of buffers
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
// Set a set of floating-point numbers to represent red
GLfloat vRed [] = {0.0 1.0 f, f, f 0.0, 1.0} f;
// Passes to the storage shader, the GLT_SHADER_IDENTITY shader, which simply renders the geometry on the screen using the specified color and default Cartesian coordinates
shaderManager.UseStockShader(GLT_SHADER_IDENTITY,vRed);
// Submit the shader
triangleBatch.Draw();
// Will render in the background buffer and then swap to the foreground at the end
glutSwapBuffers();
}
int main(int argc,char* argv[])
{
// Set the current working directory for MAC OS X
gltSetWorkingDirectory(argv[0]);
// Initialize the GLUT library
glutInit(&argc, argv);
/* Initialize the double buffer window, where GLUT_DOUBLE, GLUT_RGBA, GLUT_DEPTH, GLUT_STENCIL indicate respectively
Double buffered window, RGBA color mode, depth testing, template buffer */
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH|GLUT_STENCIL);
//GLUT window size, title window
GlutInitWindowSize (800600);
glutCreateWindow(“Triangle”);
// Register the callback function
glutReshapeFunc(ChangeSize);
glutDisplayFunc(RenderScene);
// There are no problems with driver initialization.
GLenum err = glewInit();
if(GLEW_OK ! = err) {
fprintf(stderr,”glew error:%s\n”,glewGetErrorString(err));
return 1;
}
/ / call SetupRC
SetupRC();
glutMainLoop();
return 0;
}