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annotate pytouhou/ui/opengl/backend.pyx @ 583:47cf4e3d159d

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Use libepoxy to discover the actual GL version we are using, and available extensions.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 05 Oct 2014 20:38:06 +0200
parents 6e79756b7f42
children e0166cda75d5
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1 from pytouhou.lib cimport sdl
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2 from pytouhou.lib.sdl cimport Window
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3
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4 from pytouhou.lib.opengl cimport \
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5 (glEnable, glHint, glEnableClientState, GL_TEXTURE_2D, GL_BLEND,
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6 GL_PERSPECTIVE_CORRECTION_HINT, GL_FOG_HINT, GL_NICEST,
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7 GL_COLOR_ARRAY, GL_VERTEX_ARRAY, GL_TEXTURE_COORD_ARRAY,
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8 glPushDebugGroup, GL_DEBUG_SOURCE_APPLICATION, glPopDebugGroup,
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9 epoxy_gl_version, epoxy_is_desktop_gl, epoxy_has_gl_extension)
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11
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12 GameRenderer = None
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15 def init(options):
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16 '''
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17 Initialize the OpenGL module, and raise if something bad prevents it from
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18 working.
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19 '''
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20
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21 global profile, major, minor, double_buffer, is_legacy, GameRenderer
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22
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23 flavor = options['flavor']
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24 assert flavor in ('core', 'es', 'compatibility', 'legacy')
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25 profile = (sdl.GL_CONTEXT_PROFILE_CORE if flavor == 'core' else
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26 sdl.GL_CONTEXT_PROFILE_ES if flavor == 'es' else
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27 sdl.GL_CONTEXT_PROFILE_COMPATIBILITY)
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28
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29 version = str(options['version'])
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30 assert len(version) == 3 and version[1] == '.'
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31 major = int(version[0])
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32 minor = int(version[2])
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33
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34 maybe_double_buffer = options['double-buffer']
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35 double_buffer = maybe_double_buffer if maybe_double_buffer is not None else -1
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36
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37 is_legacy = flavor == 'legacy'
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38 is_gles = flavor == 'es'
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39
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40 #TODO: check for framebuffer/renderbuffer support.
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41
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42 from pytouhou.ui.opengl.gamerenderer import GameRenderer
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44
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45 def discover_features():
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46 '''Discover which features are supported by our context.'''
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47
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48 global use_debug_group, use_vao, shader_header
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49
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50 version = epoxy_gl_version()
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51 is_desktop = epoxy_is_desktop_gl()
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52
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53 use_debug_group = (is_desktop and version >= 43) or epoxy_has_gl_extension('GL_KHR_debug')
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54 use_vao = (is_desktop and version >= 30) or epoxy_has_gl_extension('GL_ARB_vertex_array_object')
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55
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56 if is_desktop:
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57 # gl_FragColor isn’t supported anymore starting with GLSL 4.2.
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58 if version >= 42:
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59 version = 41
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60 try:
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61 glsl_version = {20: 110, 21: 120, 30: 130, 31: 140, 32: 150}[version]
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62 except KeyError:
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63 assert version >= 33
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64 glsl_version = version * 10
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65 shader_header = '#version %d\n\n' % glsl_version
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66 else:
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67 # The attribute keyword isn’t supported past GLSL ES 3.0.
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68 if version >= 30:
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69 version = 20
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70 glsl_version = {20: '100', 30: '300 es'}[version]
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71 shader_header = '#version %s\n\nprecision highp float;\n\n' % glsl_version
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72
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73
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74 def create_window(title, x, y, width, height):
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75 '''Create a window (using SDL) and an OpenGL context.'''
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76
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77 sdl.gl_set_attribute(sdl.GL_CONTEXT_PROFILE_MASK, profile)
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78 sdl.gl_set_attribute(sdl.GL_CONTEXT_MAJOR_VERSION, major)
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79 sdl.gl_set_attribute(sdl.GL_CONTEXT_MINOR_VERSION, minor)
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80 sdl.gl_set_attribute(sdl.GL_DEPTH_SIZE, 24)
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81 if double_buffer >= 0:
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82 sdl.gl_set_attribute(sdl.GL_DOUBLEBUFFER, double_buffer)
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83
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84 flags = sdl.WINDOW_SHOWN | sdl.WINDOW_OPENGL
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85
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86 #TODO: legacy can support one of the framebuffer extensions.
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87 if not is_legacy:
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88 flags |= sdl.WINDOW_RESIZABLE
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89
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90 window = Window(title, x, y, width, height, flags)
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91 window.gl_create_context()
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92
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93 discover_features()
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94
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95 if use_debug_group:
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96 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "OpenGL initialisation")
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97
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98 # Initialize OpenGL
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99 glEnable(GL_BLEND)
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100 if is_legacy:
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101 glEnable(GL_TEXTURE_2D)
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102 glHint(GL_FOG_HINT, GL_NICEST)
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103 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
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104 glEnableClientState(GL_COLOR_ARRAY)
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105 glEnableClientState(GL_VERTEX_ARRAY)
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106 glEnableClientState(GL_TEXTURE_COORD_ARRAY)
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107
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108 if use_debug_group:
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109 glPopDebugGroup()
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110
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111 return window