// Save as test1.cpp and compile with:
// gcc -I../libsdl/SDL -lSDL -lGL -o test1 test1.cpp

// run and compare this test with software rendering
// ./test1
// LIBGL_ALWAYS_SOFTWARE=1 ./test1

// red, yellow, pink, and white lines should show.
// The problem with Nouveau: only red and yellow lines are shown
// This problem occurs on GL_SHORT or GL_FLOAT, but not GL_INT

// Hardware: NV44 [GeForce 6200SE TurboCache (TM)] (rev a1)

#include <SDL/SDL.h>
#include <SDL/SDL_opengl.h>
#include <unistd.h>

int main(int argc, char **argv)
{
	SDL_Init(SDL_INIT_VIDEO);
	SDL_Surface *screen = SDL_SetVideoMode(512, 384, 0, SDL_OPENGL);

	glScalef(1.0 / 32768, 1.0 / 32768, 1);

	const int array1size = 32;
	short array1[array1size];

	for(int i=0; i < array1size; i++)
	{
		array1[i] = i * 23565 + 25782 + i * i * 2357;
	}

	while(true)
	{
		usleep(20000);
		SDL_Event event;
		while(SDL_PollEvent(&event))
		{
			switch(event.type)
			{
			case SDL_QUIT:
				SDL_Quit();
				return 0;
				break;
			}
		}

		for(int i=0; i < array1size; i++)
			array1[i] += 20 + i * 4;


		glVertexPointer(2, GL_SHORT, 0, array1);

		//int array2[array1size];
		//for(int i=0; i < array1size; i++)
		//	array2[i] = array1[i];
		//glVertexPointer(2, GL_INT, 0, array2);

		glClear(GL_COLOR_BUFFER_BIT);
		glEnableClientState(GL_VERTEX_ARRAY);
		for(int i=0; i < array1size/2; i += 4)
		{
			glColor3ub(255,i & 4 ? 255 : 0,i & 8 ? 255 : 0);
			glDrawArrays(GL_LINE_LOOP, i, 4);
		}
		//glDrawArrays(GL_LINE_LOOP, 0, array1size / 2);
		glDisableClientState(GL_VERTEX_ARRAY);
		SDL_GL_SwapBuffers();

	}
	return 0;
}