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annotate pytouhou/ui/opengl/backend.pyx @ 595:b7b4a234bf70

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Fix legacy OpenGL support, and detect the absence of non-legacy context with libepoxy.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 19 Oct 2014 17:22:26 +0200
parents 974decb8df4f
children 23b9418e4b2f
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1 from pytouhou.lib import sdl
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2 from pytouhou.lib cimport sdl
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3 from pytouhou.lib.sdl cimport Window
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4
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5 from pytouhou.lib.opengl cimport \
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6 (glEnable, glHint, glEnableClientState, GL_TEXTURE_2D, GL_BLEND,
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7 GL_PERSPECTIVE_CORRECTION_HINT, GL_FOG_HINT, GL_NICEST,
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8 GL_COLOR_ARRAY, GL_VERTEX_ARRAY, GL_TEXTURE_COORD_ARRAY,
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9 glPushDebugGroup, GL_DEBUG_SOURCE_APPLICATION, glPopDebugGroup,
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10 epoxy_gl_version, epoxy_is_desktop_gl, epoxy_has_gl_extension,
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11 GL_PRIMITIVE_RESTART, glPrimitiveRestartIndex, glPixelStorei,
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12 GL_PACK_INVERT_MESA, GL_TRIANGLE_STRIP, GL_TRIANGLES)
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13
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14
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15 GameRenderer = None
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18 def init(options):
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19 '''
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20 Initialize the OpenGL module, and raise if something bad prevents it from
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21 working.
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22 '''
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24 cdef str flavor
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26 global profile, major, minor, double_buffer, is_legacy, GameRenderer
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27
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28 flavor = options['flavor']
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29 assert flavor in ('core', 'es', 'compatibility', 'legacy')
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30 profile = (sdl.GL_CONTEXT_PROFILE_CORE if flavor == 'core' else
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31 sdl.GL_CONTEXT_PROFILE_ES if flavor == 'es' else
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32 sdl.GL_CONTEXT_PROFILE_COMPATIBILITY)
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33
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34 version = str(options['version'])
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35 assert len(version) == 3 and version[1] == '.'
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36 major = int(version[0])
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37 minor = int(version[2])
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38
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39 maybe_double_buffer = options['double-buffer']
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40 double_buffer = maybe_double_buffer if maybe_double_buffer is not None else -1
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41
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42 is_legacy = flavor == 'legacy' or flavor == 'compatibility' and major < 2
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44 #TODO: check for framebuffer/renderbuffer support.
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45
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46 from pytouhou.ui.opengl.gamerenderer import GameRenderer
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49 cdef void discover_features() except *:
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50 '''Discover which features are supported by our context.'''
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51
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52 global use_debug_group, use_vao, use_primitive_restart, use_framebuffer_blit, use_pack_invert
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53 global primitive_mode
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54 global shader_header
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55 global is_legacy
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56
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57 version = epoxy_gl_version()
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58 is_desktop = epoxy_is_desktop_gl()
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59 is_legacy = is_desktop and version < 20
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61 use_debug_group = (is_desktop and version >= 43) or epoxy_has_gl_extension('GL_KHR_debug')
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62 use_vao = (is_desktop and version >= 30) or epoxy_has_gl_extension('GL_ARB_vertex_array_object')
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63 use_primitive_restart = (is_desktop and version >= 31)
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64 use_framebuffer_blit = (is_desktop and version >= 30)
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65 use_pack_invert = epoxy_has_gl_extension('GL_MESA_pack_invert')
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66
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67 primitive_mode = GL_TRIANGLE_STRIP if use_primitive_restart else GL_TRIANGLES
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68
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69 if not is_legacy:
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70 if is_desktop:
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71 # gl_FragColor isn’t supported anymore starting with GLSL 4.2.
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72 if version >= 42:
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73 version = 41
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74 try:
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75 glsl_version = {20: 110, 21: 120, 30: 130, 31: 140, 32: 150}[version]
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76 except KeyError:
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77 assert version >= 33
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78 glsl_version = version * 10
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79 shader_header = ('#version %d\n\n' % glsl_version).encode()
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80 else:
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81 # The attribute keyword isn’t supported past GLSL ES 3.0.
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82 if version >= 30:
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83 version = 20
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84 glsl_version = {20: '100', 30: '300 es'}[version]
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85 shader_header = ('#version %s\n\nprecision highp float;\n\n' % glsl_version).encode()
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86
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87
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88 def create_window(title, x, y, width, height, swap_interval):
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89 '''Create a window (using SDL) and an OpenGL context.'''
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90
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91 sdl.gl_set_attribute(sdl.GL_CONTEXT_PROFILE_MASK, profile)
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92 sdl.gl_set_attribute(sdl.GL_CONTEXT_MAJOR_VERSION, major)
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93 sdl.gl_set_attribute(sdl.GL_CONTEXT_MINOR_VERSION, minor)
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94 sdl.gl_set_attribute(sdl.GL_DEPTH_SIZE, 24)
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95 if double_buffer >= 0:
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96 sdl.gl_set_attribute(sdl.GL_DOUBLEBUFFER, double_buffer)
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97
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98 flags = sdl.WINDOW_SHOWN | sdl.WINDOW_OPENGL
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99 if not is_legacy:
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100 flags |= sdl.WINDOW_RESIZABLE
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101
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102 window = Window(title, x, y, width, height, flags)
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103 window.gl_create_context()
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104
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105 discover_features()
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107 #TODO: legacy could support one of the framebuffer extensions for resize,
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108 # but for now set the window to a fixed size.
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109 if is_legacy and flags & sdl.WINDOW_RESIZABLE:
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110 flags &= ~sdl.WINDOW_RESIZABLE
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111 window = Window(title, x, y, width, height, flags)
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112 window.gl_create_context()
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113
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114 if use_debug_group:
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115 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "OpenGL initialisation")
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116
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117 # Initialize OpenGL
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118 glEnable(GL_BLEND)
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119 if is_legacy:
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120 glEnable(GL_TEXTURE_2D)
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121 glHint(GL_FOG_HINT, GL_NICEST)
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122 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
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123 glEnableClientState(GL_COLOR_ARRAY)
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124 glEnableClientState(GL_VERTEX_ARRAY)
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125 glEnableClientState(GL_TEXTURE_COORD_ARRAY)
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126
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127 if use_primitive_restart:
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128 glEnable(GL_PRIMITIVE_RESTART)
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129 glPrimitiveRestartIndex(0xFFFF);
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130
592
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131 if use_pack_invert:
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132 glPixelStorei(GL_PACK_INVERT_MESA, True)
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133
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134 if use_debug_group:
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135 glPopDebugGroup()
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136
589
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137 if swap_interval is not None:
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138 try:
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139 sdl.gl_set_swap_interval(swap_interval)
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140 except sdl.SDLError:
595
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141 # The OpenGL context doesn’t support setting the swap interval,
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142 # we’ll probably fallback to SDL_Delay-based clocking.
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143 pass
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144
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145 return window