annotate pytouhou/ui/opengl/backend.pyx @ 587:6c9d8a3d853f

Use ARB_framebuffer_blit instead of a second rendering pass for scaled rendering, if supported, and remove framebuffer stuff from the Renderer.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 08 Oct 2014 18:34:27 +0200
parents e0166cda75d5
children 0768122da817
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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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10 GL_PRIMITIVE_RESTART, glPrimitiveRestartIndex)
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12
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13 GameRenderer = None
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14
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15
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16 def init(options):
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17 '''
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18 Initialize the OpenGL module, and raise if something bad prevents it from
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19 working.
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20 '''
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21
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22 global profile, major, minor, double_buffer, is_legacy, GameRenderer
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23
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24 flavor = options['flavor']
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25 assert flavor in ('core', 'es', 'compatibility', 'legacy')
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26 profile = (sdl.GL_CONTEXT_PROFILE_CORE if flavor == 'core' else
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27 sdl.GL_CONTEXT_PROFILE_ES if flavor == 'es' else
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28 sdl.GL_CONTEXT_PROFILE_COMPATIBILITY)
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29
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30 version = str(options['version'])
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31 assert len(version) == 3 and version[1] == '.'
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32 major = int(version[0])
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33 minor = int(version[2])
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34
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35 maybe_double_buffer = options['double-buffer']
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36 double_buffer = maybe_double_buffer if maybe_double_buffer is not None else -1
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37
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38 is_legacy = flavor == 'legacy'
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39 is_gles = flavor == 'es'
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40
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41 #TODO: check for framebuffer/renderbuffer support.
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42
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43 from pytouhou.ui.opengl.gamerenderer import GameRenderer
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44
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45
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46 def discover_features():
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47 '''Discover which features are supported by our context.'''
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48
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49 global use_debug_group, use_vao, use_primitive_restart, shader_header
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50
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51 version = epoxy_gl_version()
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52 is_desktop = epoxy_is_desktop_gl()
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53
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54 use_debug_group = (is_desktop and version >= 43) or epoxy_has_gl_extension('GL_KHR_debug')
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55 use_vao = (is_desktop and version >= 30) or epoxy_has_gl_extension('GL_ARB_vertex_array_object')
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56 use_primitive_restart = (is_desktop and version >= 31)
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57 use_framebuffer_blit = (is_desktop and version >= 30)
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58
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59 if is_desktop:
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60 # gl_FragColor isn’t supported anymore starting with GLSL 4.2.
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61 if version >= 42:
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62 version = 41
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63 try:
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64 glsl_version = {20: 110, 21: 120, 30: 130, 31: 140, 32: 150}[version]
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65 except KeyError:
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66 assert version >= 33
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67 glsl_version = version * 10
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68 shader_header = '#version %d\n\n' % glsl_version
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69 else:
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70 # The attribute keyword isn’t supported past GLSL ES 3.0.
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71 if version >= 30:
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72 version = 20
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73 glsl_version = {20: '100', 30: '300 es'}[version]
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74 shader_header = '#version %s\n\nprecision highp float;\n\n' % glsl_version
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75
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76
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77 def create_window(title, x, y, width, height):
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78 '''Create a window (using SDL) and an OpenGL context.'''
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79
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80 sdl.gl_set_attribute(sdl.GL_CONTEXT_PROFILE_MASK, profile)
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81 sdl.gl_set_attribute(sdl.GL_CONTEXT_MAJOR_VERSION, major)
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82 sdl.gl_set_attribute(sdl.GL_CONTEXT_MINOR_VERSION, minor)
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83 sdl.gl_set_attribute(sdl.GL_DEPTH_SIZE, 24)
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84 if double_buffer >= 0:
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85 sdl.gl_set_attribute(sdl.GL_DOUBLEBUFFER, double_buffer)
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86
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87 flags = sdl.WINDOW_SHOWN | sdl.WINDOW_OPENGL
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88
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89 #TODO: legacy can support one of the framebuffer extensions.
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90 if not is_legacy:
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91 flags |= sdl.WINDOW_RESIZABLE
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92
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93 window = Window(title, x, y, width, height, flags)
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94 window.gl_create_context()
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95
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96 discover_features()
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97
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98 if use_debug_group:
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99 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "OpenGL initialisation")
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100
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101 # Initialize OpenGL
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102 glEnable(GL_BLEND)
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103 if is_legacy:
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104 glEnable(GL_TEXTURE_2D)
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105 glHint(GL_FOG_HINT, GL_NICEST)
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106 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
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107 glEnableClientState(GL_COLOR_ARRAY)
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108 glEnableClientState(GL_VERTEX_ARRAY)
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109 glEnableClientState(GL_TEXTURE_COORD_ARRAY)
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110
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111 if use_primitive_restart:
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112 glEnable(GL_PRIMITIVE_RESTART)
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113 glPrimitiveRestartIndex(0xFFFF);
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114
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115 if use_debug_group:
6e79756b7f42 Don’t call gl*DebugGroup if it isn’t exposed by the driver.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 579
diff changeset
116 glPopDebugGroup()
553
8f51e34d911c Refactor graphics backend selection, to make them fallbackable and optional.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
117
8f51e34d911c Refactor graphics backend selection, to make them fallbackable and optional.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
118 return window