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  1.  
  2. import ctypes
  3. import OpenGL.GL as gl
  4. from sdl2 import * #everything has a SDL_ prefix. ick!
  5. import numpy as np
  7. W,H=640,480
  8. FPS=60
  9. frame_minticks=1000/60
  11. # === SDL/OpenGL init ===
  13. SDL_Init(SDL_INIT_VIDEO)
  15. SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION,3);
  16. SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION,3);
  17. SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER,1);
  18. SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,24);
  20. window=SDL_CreateWindow("OpenGL test",100,100,W,H,SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN)
  22. context=SDL_GL_CreateContext(window)
  23. SDL_GL_SetSwapInterval(0)
  25. gl.glClearColor(1.0,1.0,1.0,1.0)
  26. gl.glClear(gl.GL_COLOR_BUFFER_BIT|gl.GL_DEPTH_BUFFER_BIT)
  27. SDL_GL_SwapWindow(window)
  29. # === shader compilation ===
  31. shader_program=gl.glCreateProgram()
  32. shader_vertex=gl.glCreateShader(gl.GL_VERTEX_SHADER)
  33. shader_fragment=gl.glCreateShader(gl.GL_FRAGMENT_SHADER)
  35. gl.glShaderSource(shader_vertex, """
  36. #version 330
  37. attribute vec3 position;
  38. attribute vec4 color;
  39. varying vec4 v_color;
  40. void main()
  41. {
  42. gl_Position=vec4(position,1.0);
  43. v_color=color;
  44. }
  45. """)
  46. gl.glShaderSource(shader_fragment, """
  47. #version 330
  48. varying vec4 v_color;
  49. void main()
  50. {
  51. gl_FragColor=v_color;
  52. }
  53. """)
  55. gl.glCompileShader(shader_vertex)
  56. print "=== vertex shader log ==="
  57. if gl.glGetShaderiv(shader_vertex,gl.GL_COMPILE_STATUS):
  58. print "OK"
  59. else:
  60. log=gl.glGetShaderInfoLog(shader_vertex)
  61. print log
  63. gl.glCompileShader(shader_fragment)
  64. print "=== fragment shader log ==="
  65. if gl.glGetShaderiv(shader_fragment,gl.GL_COMPILE_STATUS):
  66. print "OK"
  67. else:
  68. log=gl.glGetShaderInfoLog(shader_fragment)
  69. print log
  71. print "=== end shader logs ==="
  73. gl.glAttachShader(shader_program,shader_vertex)
  74. gl.glAttachShader(shader_program,shader_fragment)
  75. gl.glLinkProgram(shader_program)
  77. gl.glUseProgram(shader_program)
  79. # === buffer creation ===
  81. vertex_data=np.zeros(4,dtype=[("position",np.float32,3),("color",np.float32,4)])
  82. vertex_data[1]=((-1,-1,1),(1,0,0,1))
  83. vertex_data[0]=(( 1,-1,1),(0,1,0,1))
  84. vertex_data[2]=(( 1, 1,1),(0,0,1,1))
  85. vertex_data[3]=((-1, 1,1),(1,1,0,1))
  87. vertex_buffer=gl.glGenBuffers(1)
  88. gl.glBindBuffer(gl.GL_ARRAY_BUFFER,vertex_buffer)
  89. gl.glBufferData(gl.GL_ARRAY_BUFFER,vertex_data.nbytes,vertex_data,gl.GL_DYNAMIC_DRAW)
  91. # === buffer binding ===
  93. stride=vertex_data.strides[0]
  95. offset=ctypes.c_void_p(0)
  96. loc=gl.glGetAttribLocation(shader_program,"position")
  97. gl.glEnableVertexAttribArray(loc)
  98. gl.glBindBuffer(gl.GL_ARRAY_BUFFER,vertex_buffer)
  99. gl.glVertexAttribPointer(loc,3,gl.GL_FLOAT,False,stride,offset)
  101. offset=ctypes.c_void_p(vertex_data.dtype["position"].itemsize)
  102. loc=gl.glGetAttribLocation(shader_program,"color")
  103. gl.glEnableVertexAttribArray(loc)
  104. gl.glBindBuffer(gl.GL_ARRAY_BUFFER,vertex_buffer)
  105. gl.glVertexAttribPointer(loc,4,gl.GL_FLOAT,False,stride,offset)
  107. # === main loop ===
  109. event=SDL_Event()
  110. while True:
  111. frame_startticks=SDL_GetTicks()
  113. while SDL_PollEvent(ctypes.byref(event))!=0:
  114. if event.type==SDL_QUIT:
  115. SDL_DestroyWindow(window)
  116. SDL_Quit()
  117. raise SystemExit("clean exit")
  119. gl.glClear(gl.GL_COLOR_BUFFER_BIT|gl.GL_DEPTH_BUFFER_BIT)
  121. gl.glDrawArrays(gl.GL_TRIANGLE_STRIP, 0, 4)
  123. SDL_GL_SwapWindow(window)
  125. frame_endticks=SDL_GetTicks()
  126. frame_spentticks=frame_endticks-frame_startticks
  127. if(frame_spentticks<frame_minticks):
  128. SDL_Delay(frame_minticks-frame_spentticks)
  129.  
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