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Creating point in OpenGL without glVertex

2 posts in this topic

I am doing a homework where I can't use glVertex or gluOrtho to create points on a screen. I am suppose to be using certain algorithms to draw lines, boxes, etc on the screen with points but I can't make a point..lol. Can someone please point me in the right direction? I know I need to use glDrawPixels but how do I set up the pixel buffer that DrawPixels uses? Would I make like a 2D int matrix with a width and height equal to my screen size, then put like a 1 in pixels i want on and 0 in pixels i want off? Also instead of gluOrtho, would I use glRasterPos and glWindowPos?

- Edit: Can someone please move this post to the OpenGL section of the forums if they think it is better off there. Edited by Kevn

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[sup]not sure what that means [img]http://public.gamedev.net//public/style_emoticons/default/sad.png[/img] [/sup]
[sup]Well, I got my program to draw a line one pixel at a time using glDrawPixels. Only it repeats the same line over and over to the right and left of the line I told it to draw. So like if I told it to draw a line from position (100,100) to (600,600). there will be a line there but then another like from (300,100) to (900, 600). and another so many pixels to the right and left in the x direction over.[/sup]

[sup]the code in question, the linebres just uses a line algorithm that calls setPixel however many times needed to draw the line: [/sup]
struct RGBType {
float r;
float g;
float b;
RGBType *pixel_buffer = new RGBType[800 * 1200];
using namespace std;
int window_height = 800;
int window_width = 1200;
void setPixel(int x, int y)
pixel_buffer[800*y + x].r=0.5;
pixel_buffer[800*y + x].g=0.5;
pixel_buffer[800*y + x].b=0.5;

void display(void) {
glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
lineBres(100, 100, 600, 600);
glDrawPixels(window_width, window_height, GL_RGB, GL_FLOAT, pixel_buffer);
delete[] pixel_buffer;
int main(int argc, char* argv[])
glutInit(&argc, argv);
glutInitWindowSize (window_width, window_height);
glutInitWindowPosition (100,100);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutCreateWindow ("Project 1");
glViewport(0, 0, 800, 1200);
glLoadIdentity( );
glLoadIdentity( );
gluOrtho2D(0.0, 800.0, 0.0, 1200.0);

return 0;
[/CODE][/sup] Edited by Kevn

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