Hi.
I have a very small program that i hoped would draw a blue point at a coordinate i wanted. But it always draws at the middle of the screen. Can you tell what i’m missing?
Here is all of the code:
#include <GL/glew.h>
#include <GL/glut.h>
float vertices[][3]=
{
{0.5f ,0.5f,0.0f} //This is the coordinate that i want to draw.
};
void display();
int main(int argc, char* argv[])
{
glutInit(&argc , argv);
glutCreateWindow("Window");
GLenum res = glewInit();
if (res != GLEW_OK)
{
return 1;
}
glClearColor(255,0,0,0);
glPointSize(10.0f);
GLuint vbo = 0;
glGenBuffers (1, &vbo);
glBindBuffer (GL_ARRAY_BUFFER, vbo);
glBufferData (GL_ARRAY_BUFFER, 3*sizeof (float), vertices, GL_STATIC_DRAW);
glEnableVertexAttribArray (0);
glBindBuffer (GL_ARRAY_BUFFER, vbo);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}
void display() {
glClear(GL_COLOR_BUFFER_BIT);
glColor4f(0,0,255,255);
glDrawArrays (GL_POINTS, 0, 1);
}