SDL2 で OpenGL - 三角形の出力

10199 ワード
Python OpenGL PySDL2 SDL Python テキストリンク

はじめに

pysdl2でOpenGLを使ってみたメモです。

環境

  • Ubuntu14.04
  • Python3.4.3

PySDL2のインストール

http://pysdl2.readthedocs.io/en/rel_0_9_4/install.html#getting-the-sources
に従いインストール。

回るトライアングル

import sdl2
from OpenGL import GL, GLU
import ctypes

def main():
    WINDOW_WIDTH = 400
    WINDOW_HEIGHT = 300

    if sdl2.SDL_Init(sdl2.SDL_INIT_VIDEO) != 0:
        print(sdl2.SDL_GetError())
        return -1

    window = sdl2.SDL_CreateWindow(
        b"Triangle",
        sdl2.SDL_WINDOWPOS_UNDEFINED,
        sdl2.SDL_WINDOWPOS_UNDEFINED, WINDOW_WIDTH, WINDOW_HEIGHT,
        sdl2.SDL_WINDOW_OPENGL
    )
    if not window:
        print(sdl2.SDL_GetError())
        return -1

    ctx = sdl2.SDL_GL_CreateContext(window)

    GL.glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT)
    GL.glMatrixMode(GL.GL_PROJECTION | GL.GL_MODELVIEW)
    GL.glLoadIdentity()
    GLU.gluPerspective(30.0, WINDOW_WIDTH/WINDOW_HEIGHT, 1.0, 100.0)
    GLU.gluLookAt(0.0, 0.0, 10.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)

    ev = sdl2.SDL_Event()
    isrunning = True
    while isrunning:
        while sdl2.SDL_PollEvent(ctypes.byref(ev)) != 0:
            if ev.type == sdl2.SDL_QUIT:
                isrunning = not isrunning

        GL.glClearColor(0, 0, 0, 1)
        GL.glClear(GL.GL_COLOR_BUFFER_BIT)

        GL.glRotatef(1.0, 0.0, 1.0, 0.0)

        GL.glBegin(GL.GL_TRIANGLES)
        GL.glColor3f(1.0, 0.0, 0.0)
        GL.glVertex2f(0.0, 1.0)
        GL.glColor3f(0.0, 1.0, 0.0)
        GL.glVertex2f(1.0, -1.0)
        GL.glColor3f(0.0, 0.0, 1.0)
        GL.glVertex2f(-1.0, -1.0)
        GL.glEnd()

        sdl2.SDL_GL_SwapWindow(window)
        sdl2.SDL_Delay(10)

    sdl2.SDL_GL_DeleteContext(ctx)
    sdl2.SDL_DestroyWindow(window)
    sdl2.SDL_Quit()

    return 0

if __name__ == '__main__':
    import sys
    sys.exit(main())