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annotate pytouhou/ui/opengl/backend.pyx @ 767:ccb04468c5fa

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author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 30 Aug 2022 17:07:21 +0200
parents 4fa0a8e7d941
children
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80687f258001 Make sdl.Window inherit from gui.Window, so we can swap implementations.
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1 cimport pytouhou.lib.gui as gui
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2 from pytouhou.lib.gui import Error as GUIError
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3 from .backend_sdl import create_sdl_window
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4 from .backend_glfw import create_glfw_window
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5
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6 from pytouhou.lib.opengl cimport \
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7 (glEnable, glHint, glEnableClientState, GL_TEXTURE_2D, GL_BLEND,
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8 GL_PERSPECTIVE_CORRECTION_HINT, GL_FOG_HINT, GL_NICEST,
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9 GL_COLOR_ARRAY, GL_VERTEX_ARRAY, GL_TEXTURE_COORD_ARRAY,
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10 glPushDebugGroup, GL_DEBUG_SOURCE_APPLICATION, glPopDebugGroup,
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11 epoxy_gl_version, epoxy_is_desktop_gl, epoxy_has_gl_extension,
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12 GL_PRIMITIVE_RESTART, glPrimitiveRestartIndex, glPixelStorei,
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13 GL_PACK_INVERT_MESA, GL_QUADS, GL_TRIANGLE_STRIP, GL_TRIANGLES)
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16 GameRenderer = None
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17
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19 def init(options):
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20 '''
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21 Initialize the OpenGL module, and raise if something bad prevents it from
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22 working.
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23 '''
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25 cdef str flavor
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27 global profile, major, minor, double_buffer, is_legacy, GameRenderer, use_glfw
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29 use_glfw = options['frontend'] == 'glfw'
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30 flavor = options['flavor']
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31 assert flavor in ('core', 'es', 'compatibility', 'legacy')
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32 profile = flavor
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33 version = str(options['version'])
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34 assert len(version) == 3 and version[1] == '.'
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35 major = int(version[0])
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36 minor = int(version[2])
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37
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38 maybe_double_buffer = options['double-buffer']
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39 double_buffer = maybe_double_buffer if maybe_double_buffer is not None else -1
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41 is_legacy = flavor == 'legacy' or flavor == 'compatibility' and major < 2
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42
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43 #TODO: check for framebuffer/renderbuffer support.
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44
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45 from pytouhou.ui.opengl.gamerenderer import GameRenderer
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47
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48 cdef bint discover_features() except True:
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49 '''Discover which features are supported by our context.'''
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50
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51 global use_debug_group, use_vao, use_primitive_restart, use_framebuffer_blit, use_pack_invert, use_scaled_rendering
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52 global primitive_mode
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53 global shader_header
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54 global is_legacy
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56 version = epoxy_gl_version()
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57 is_desktop = epoxy_is_desktop_gl()
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58 is_legacy = is_legacy or (is_desktop and version < 20)
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60 use_debug_group = (is_desktop and version >= 43) or epoxy_has_gl_extension('GL_KHR_debug')
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61 use_vao = (is_desktop and version >= 30) or epoxy_has_gl_extension('GL_ARB_vertex_array_object')
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62 use_primitive_restart = (is_desktop and version >= 31)
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63 use_framebuffer_blit = (is_desktop and version >= 30)
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64 use_pack_invert = epoxy_has_gl_extension('GL_MESA_pack_invert')
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65 use_scaled_rendering = not is_legacy #TODO: try to use the EXT framebuffer extension.
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66
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67 primitive_mode = (GL_QUADS if is_legacy else
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68 GL_TRIANGLE_STRIP if use_primitive_restart else
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69 GL_TRIANGLES)
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71 if not is_legacy:
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72 if is_desktop:
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73 # gl_FragColor isn’t supported anymore starting with GLSL 4.2.
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74 if version >= 42:
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75 version = 41
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76 try:
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77 glsl_version = {20: 110, 21: 120, 30: 130, 31: 140, 32: 150}[version]
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78 except KeyError:
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79 assert version >= 33
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80 glsl_version = version * 10
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81 shader_header = ('#version %d\n\n' % glsl_version).encode()
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82 else:
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83 # The attribute keyword isn’t supported past GLSL ES 3.0.
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84 if version >= 30:
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85 version = 20
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86 glsl_version = {20: '100', 30: '300 es'}[version]
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87 shader_header = ('#version %s\n\nprecision highp float;\n\n' % glsl_version).encode()
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88
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89
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90 def create_window(title, x, y, width, height, swap_interval):
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91 '''Create a window (using SDL) and an OpenGL context.'''
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92
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93 cdef gui.Window window
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94 if use_glfw:
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95 window = create_glfw_window(title, width, height)
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96 else:
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97 window = create_sdl_window(title, x, y, width, height)
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98 window.create_gl_context()
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99 discover_features()
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100
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101 if use_debug_group:
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102 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "OpenGL initialisation")
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103
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104 # Initialize OpenGL
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105 glEnable(GL_BLEND)
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106 if is_legacy:
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107 glEnable(GL_TEXTURE_2D)
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108 glHint(GL_FOG_HINT, GL_NICEST)
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109 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
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110 glEnableClientState(GL_COLOR_ARRAY)
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111 glEnableClientState(GL_VERTEX_ARRAY)
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112 glEnableClientState(GL_TEXTURE_COORD_ARRAY)
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113
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114 if use_primitive_restart:
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115 glEnable(GL_PRIMITIVE_RESTART)
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116 glPrimitiveRestartIndex(0xFFFF);
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117
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118 if use_pack_invert:
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119 glPixelStorei(GL_PACK_INVERT_MESA, True)
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120
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121 if use_debug_group:
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122 glPopDebugGroup()
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123
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124 if swap_interval is not None:
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125 try:
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126 window.set_swap_interval(swap_interval)
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127 except GUIError:
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128 # The OpenGL context doesn’t support setting the swap interval,
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129 # we’ll probably fallback to SDL_Delay-based clocking.
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130 pass
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131
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132 return window