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"""OpenGL rendering simulation"""
import sys
import ctypes
from OpenGL import GL, GLU
import sdl2
def run():
if sdl2.SDL_Init(sdl2.SDL_INIT_VIDEO) != 0:
print(sdl2.SDL_GetError())
return -1
window = sdl2.SDL_CreateWindow(b"OpenGL demo",
sdl2.SDL_WINDOWPOS_UNDEFINED,
sdl2.SDL_WINDOWPOS_UNDEFINED, 800, 600,
sdl2.SDL_WINDOW_OPENGL)
if not window:
print(sdl2.SDL_GetError())
return -1
context = sdl2.SDL_GL_CreateContext(window)
GL.glMatrixMode(GL.GL_PROJECTION | GL.GL_MODELVIEW)
GL.glLoadIdentity()
GL.glOrtho(-400, 400, 300, -300, 0, 1)
x = 0.0
y = 30.0
event = sdl2.SDL_Event()
running = True
while running:
while sdl2.SDL_PollEvent(ctypes.byref(event)) != 0:
if event.type == sdl2.SDL_QUIT:
running = False
GL.glClearColor(0, 0, 0, 1)
GL.glClear(GL.GL_COLOR_BUFFER_BIT)
GL.glRotatef(10.0, 0.0, 0.0, 1.0)
GL.glBegin(GL.GL_TRIANGLES)
GL.glColor3f(1.0, 0.0, 0.0)
GL.glVertex2f(x, y + 90.0)
GL.glColor3f(0.0, 1.0, 0.0)
GL.glVertex2f(x + 90.0, y - 90.0)
GL.glColor3f(0.0, 0.0, 1.0)
GL.glVertex2f(x - 90.0, y - 90.0)
GL.glEnd()
sdl2.SDL_GL_SwapWindow(window)
sdl2.SDL_Delay(10)
sdl2.SDL_GL_DeleteContext(context)
sdl2.SDL_DestroyWindow(window)
sdl2.SDL_Quit()
return 0
if __name__ == "__main__":
sys.exit(run())
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