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annotate pytouhou/opengl/gamerenderer.py @ 115:f0e6ae22d29a

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author Thibaut Girka <thib@sitedethib.com>
date Wed, 07 Sep 2011 00:40:14 +0200
parents 340fcda8e64a
children fad7b44cebf2
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108
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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14
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15 import struct
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16 from itertools import chain
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17
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18 import pygame
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19
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20 import OpenGL
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21 OpenGL.FORWARD_COMPATIBLE_ONLY = True
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22 from OpenGL.GL import *
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23 from OpenGL.GLU import *
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24
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25
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26 from pytouhou.opengl.texture import TextureManager
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27 from pytouhou.opengl.sprite import get_sprite_rendering_data
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28 from pytouhou.opengl.background import get_background_rendering_data
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29
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30
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31 class GameRenderer(object):
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32 def __init__(self, resource_loader, game=None, background=None):
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33 self.texture_manager = TextureManager(resource_loader)
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34
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35 self.game = game
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36 self.background = background
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37
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38 self.window = None
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39
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40
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41 def start(self, width=384, height=448):
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42 # Initialize pygame
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43 pygame.init()
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44 self.window = pygame.display.set_mode((width, height),
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45 pygame.OPENGL | pygame.DOUBLEBUF)
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46
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47 # Initialize OpenGL
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48 glMatrixMode(GL_PROJECTION)
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49 glLoadIdentity()
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50 gluPerspective(30, float(width)/float(height),
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51 101010101./2010101., 101010101./10101.)
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52
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53 glEnable(GL_BLEND)
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54 glEnable(GL_TEXTURE_2D)
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55 glEnable(GL_FOG)
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56 glHint(GL_FOG_HINT, GL_NICEST)
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57 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
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58 glEnableClientState(GL_COLOR_ARRAY)
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59 glEnableClientState(GL_VERTEX_ARRAY)
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60 glEnableClientState(GL_TEXTURE_COORD_ARRAY)
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61
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62
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63 def render_elements(self, elements):
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64 texture_manager = self.texture_manager
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65 objects_by_texture = {}
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66 for element in elements:
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67 sprite = element._sprite
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68 if sprite:
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69 ox, oy = element.x, element.y
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70 key, (vertices, uvs, colors) = get_sprite_rendering_data(sprite)
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71 rec = objects_by_texture.setdefault(key, ([], [], []))
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72 vertices = ((x + ox, y + oy, z) for x, y, z in vertices)
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73 rec[0].extend(vertices)
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74 rec[1].extend(uvs)
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75 rec[2].extend(colors)
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76
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77 for (texture_key, blendfunc), (vertices, uvs, colors) in objects_by_texture.items():
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78 nb_vertices = len(vertices)
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79 glBlendFunc(GL_SRC_ALPHA, (GL_ONE_MINUS_SRC_ALPHA, GL_ONE)[blendfunc])
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80 glBindTexture(GL_TEXTURE_2D, texture_manager[texture_key])
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81 glVertexPointer(3, GL_FLOAT, 0, struct.pack(str(3 * nb_vertices) + 'f', *chain(*vertices)))
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82 glTexCoordPointer(2, GL_FLOAT, 0, struct.pack(str(2 * nb_vertices) + 'f', *chain(*uvs)))
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83 glColorPointer(4, GL_UNSIGNED_BYTE, 0, struct.pack(str(4 * nb_vertices) + 'B', *chain(*colors)))
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84 glDrawArrays(GL_QUADS, 0, nb_vertices)
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85
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86
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87 def render(self):
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88 glClear(GL_DEPTH_BUFFER_BIT)
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89
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90 back = self.background
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91 game = self.game
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92 texture_manager = self.texture_manager
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93
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94 if back is not None:
111
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95 fog_b, fog_g, fog_r, fog_start, fog_end = back.fog_interpolator.values
108
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96 x, y, z = back.position_interpolator.values
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97 dx, dy, dz = back.position2_interpolator.values
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98
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99 glFogi(GL_FOG_MODE, GL_LINEAR)
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100 glFogf(GL_FOG_START, fog_start)
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101 glFogf(GL_FOG_END, fog_end)
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102 glFogfv(GL_FOG_COLOR, (fog_r / 255., fog_g / 255., fog_b / 255., 1.))
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103
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104 glMatrixMode(GL_MODELVIEW)
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105 glLoadIdentity()
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106 # Some explanations on the magic constants:
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107 # 192. = 384. / 2. = width / 2.
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108 # 224. = 448. / 2. = height / 2.
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109 # 835.979370 = 224./math.tan(math.radians(15)) = (height/2.)/math.tan(math.radians(fov/2))
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110 # This is so that objects on the (O, x, y) plane use pixel coordinates
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111 gluLookAt(192., 224., - 835.979370 * dz,
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112 192. + dx, 224. - dy, 0., 0., -1., 0.)
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113 glTranslatef(-x, -y, -z)
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114
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115 glEnable(GL_DEPTH_TEST)
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116 for (texture_key, blendfunc), (nb_vertices, vertices, uvs, colors) in get_background_rendering_data(back):
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117 glBlendFunc(GL_SRC_ALPHA, (GL_ONE_MINUS_SRC_ALPHA, GL_ONE)[blendfunc])
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118 glBindTexture(GL_TEXTURE_2D, texture_manager[texture_key])
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119 glVertexPointer(3, GL_FLOAT, 0, vertices)
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120 glTexCoordPointer(2, GL_FLOAT, 0, uvs)
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121 glColorPointer(4, GL_UNSIGNED_BYTE, 0, colors)
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122 glDrawArrays(GL_QUADS, 0, nb_vertices)
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123 glDisable(GL_DEPTH_TEST)
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124 else:
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125 glClear(GL_COLOR_BUFFER_BIT)
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126
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127
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128 if game is not None:
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129 glMatrixMode(GL_MODELVIEW)
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130 glLoadIdentity()
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131 # Some explanations on the magic constants:
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132 # 192. = 384. / 2. = width / 2.
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133 # 224. = 448. / 2. = height / 2.
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134 # 835.979370 = 224./math.tan(math.radians(15)) = (height/2.)/math.tan(math.radians(fov/2))
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135 # This is so that objects on the (O, x, y) plane use pixel coordinates
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136 gluLookAt(192., 224., - 835.979370,
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137 192., 224., 0., 0., -1., 0.)
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138
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139 glDisable(GL_FOG)
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140 self.render_elements(game.enemies)
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141 self.render_elements(game.game_state.bullets)
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142 glEnable(GL_FOG)
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143