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annotate pytouhou/ui/opengl/background.pyx @ 513:5e3e0b09a531

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Move the OpenGL backend to its own package.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Thu, 05 Dec 2013 02:16:31 +0100
parents pytouhou/ui/background.pyx@bfea9e9a6845
children b3193b43a86c
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2013 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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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 from libc.stdlib cimport malloc, free, realloc
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16
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17 from pytouhou.lib.opengl cimport \
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18 (glVertexPointer, glTexCoordPointer, glColorPointer,
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19 glVertexAttribPointer, glEnableVertexAttribArray, glBlendFunc,
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20 glBindTexture, glBindBuffer, glBufferData, GL_ARRAY_BUFFER,
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21 GL_STATIC_DRAW, GL_UNSIGNED_BYTE, GL_FLOAT, GL_SRC_ALPHA,
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22 GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_TEXTURE_2D, glGenBuffers,
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23 glEnable, glDisable, GL_DEPTH_TEST, glDrawArrays, GL_QUADS)
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24
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25 from .sprite cimport get_sprite_rendering_data
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26
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27
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28 cdef class BackgroundRenderer:
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29 def __cinit__(self):
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30 # Allocate buffers
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31 self.vertex_buffer = <Vertex*> malloc(65536 * sizeof(Vertex))
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32
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33
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34 def __dealloc__(self):
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35 free(self.vertex_buffer)
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36
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37
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38 def __init__(self, use_fixed_pipeline):
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39 self.use_fixed_pipeline = use_fixed_pipeline
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40
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41 if not use_fixed_pipeline:
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42 glGenBuffers(1, &self.vbo)
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43
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44
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45 cdef void render_background(self):
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46 if self.use_fixed_pipeline:
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47 glVertexPointer(3, GL_FLOAT, sizeof(Vertex), &self.vertex_buffer[0].x)
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48 glTexCoordPointer(2, GL_FLOAT, sizeof(Vertex), &self.vertex_buffer[0].u)
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49 glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(Vertex), &self.vertex_buffer[0].r)
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50 else:
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51 glBindBuffer(GL_ARRAY_BUFFER, self.vbo)
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52
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53 #TODO: find a way to use offsetof() instead of those ugly hardcoded values.
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54 glVertexAttribPointer(0, 3, GL_FLOAT, False, sizeof(Vertex), <void*>0)
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55 glEnableVertexAttribArray(0)
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56 glVertexAttribPointer(1, 2, GL_FLOAT, False, sizeof(Vertex), <void*>12)
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57 glEnableVertexAttribArray(1)
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58 glVertexAttribPointer(2, 4, GL_UNSIGNED_BYTE, True, sizeof(Vertex), <void*>20)
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59 glEnableVertexAttribArray(2)
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60
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61 glEnable(GL_DEPTH_TEST)
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62 glBlendFunc(GL_SRC_ALPHA, (GL_ONE_MINUS_SRC_ALPHA, GL_ONE)[self.blendfunc])
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63 glBindTexture(GL_TEXTURE_2D, self.texture)
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64 glDrawArrays(GL_QUADS, 0, self.nb_vertices)
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65 glDisable(GL_DEPTH_TEST)
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66
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67 if not self.use_fixed_pipeline:
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68 glBindBuffer(GL_ARRAY_BUFFER, 0)
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69
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70
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71 cdef void load(self, background):
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72 cdef float ox, oy, oz, ox2, oy2, oz2
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73 cdef unsigned short nb_vertices = 0
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74 cdef Vertex* vertex_buffer
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75
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76 self.background = background
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77
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78 vertex_buffer = self.vertex_buffer
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79
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80 for ox, oy, oz, model_id, model in background.object_instances:
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81 for ox2, oy2, oz2, width_override, height_override, sprite in model:
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82 #TODO: view frustum culling
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83 key, (vertices, uvs, colors) = get_sprite_rendering_data(sprite)
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84 x1, x2, x3, x4, y1, y2, y3, y4, z1, z2, z3, z4 = vertices
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85 left, right, bottom, top = uvs
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86 r, g, b, a = colors
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87
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88 vertex_buffer[nb_vertices] = Vertex(x1 + ox + ox2, y1 + oy + oy2, z1 + oz + oz2, left, bottom, r, g, b, a)
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89 vertex_buffer[nb_vertices+1] = Vertex(x2 + ox + ox2, y2 + oy + oy2, z2 + oz + oz2, right, bottom, r, g, b, a)
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90 vertex_buffer[nb_vertices+2] = Vertex(x3 + ox + ox2, y3 + oy + oy2, z3 + oz + oz2, right, top, r, g, b, a)
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91 vertex_buffer[nb_vertices+3] = Vertex(x4 + ox + ox2, y4 + oy + oy2, z4 + oz + oz2, left, top, r, g, b, a)
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92
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93 nb_vertices += 4
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94
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95 self.texture = key >> 1
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96 self.blendfunc = key & 1
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97 self.nb_vertices = nb_vertices
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98 self.vertex_buffer = <Vertex*> realloc(vertex_buffer, nb_vertices * sizeof(Vertex))
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99
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100 if not self.use_fixed_pipeline:
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101 glBindBuffer(GL_ARRAY_BUFFER, self.vbo)
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102 glBufferData(GL_ARRAY_BUFFER, nb_vertices * sizeof(Vertex), &self.vertex_buffer[0], GL_STATIC_DRAW)
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103 glBindBuffer(GL_ARRAY_BUFFER, 0)