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annotate pytouhou/ui/opengl/framebuffer.pyx @ 586:4b0593da29d5

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Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 08 Oct 2014 16:34:24 +0200
parents
children 6c9d8a3d853f
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586
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2014 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 pytouhou.lib.opengl cimport \
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16 (glPushDebugGroup, glPopDebugGroup, GL_DEBUG_SOURCE_APPLICATION,
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17 glGenTextures, glDeleteTextures, glBindTexture, glTexParameteri,
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18 glTexImage2D, GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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19 GL_TEXTURE_MAG_FILTER, GL_LINEAR, GL_RGBA, GL_UNSIGNED_BYTE,
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20 glGenRenderbuffers, glDeleteRenderbuffers, glBindRenderbuffer,
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21 glRenderbufferStorage, GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
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22 glGenFramebuffers, glDeleteFramebuffers, glBindFramebuffer,
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23 glFramebufferTexture2D, glFramebufferRenderbuffer,
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24 glCheckFramebufferStatus, GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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25 GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_COMPLETE, glGenBuffers,
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26 glDeleteBuffers, glBindBuffer, glBufferData, GL_ARRAY_BUFFER,
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27 GL_STATIC_DRAW, glGenVertexArrays, glDeleteVertexArrays,
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28 glBindVertexArray, glVertexAttribPointer, GL_SHORT, GL_FLOAT,
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29 glEnableVertexAttribArray, glDrawArrays, GL_TRIANGLE_STRIP)
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30
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31 from .backend cimport use_debug_group, use_vao
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32
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33 cdef class Framebuffer:
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34 def __init__(self, int x, int y, int width, int height):
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35 if use_debug_group:
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36 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "Framebuffer creation")
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37
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38 # This texture will receive the game area in native resolution.
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39 glGenTextures(1, &self.texture)
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40 glBindTexture(GL_TEXTURE_2D, self.texture)
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41 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
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42 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
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43 glTexImage2D(GL_TEXTURE_2D, 0,
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44 GL_RGBA,
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45 width, height,
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46 0,
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47 GL_RGBA, GL_UNSIGNED_BYTE,
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48 NULL)
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49 glBindTexture(GL_TEXTURE_2D, 0)
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50
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51 # We need a depth buffer, but don’t care about retrieving it.
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52 glGenRenderbuffers(1, &self.rbo)
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53 glBindRenderbuffer(GL_RENDERBUFFER, self.rbo)
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54 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height)
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55 glBindRenderbuffer(GL_RENDERBUFFER, 0)
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56
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57 # The framebuffer is there as a rendering target.
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58 glGenFramebuffers(1, &self.fbo)
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59 glBindFramebuffer(GL_FRAMEBUFFER, self.fbo)
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60 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self.texture, 0)
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61 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, self.rbo)
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62 assert glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE
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63 glBindFramebuffer(GL_FRAMEBUFFER, 0)
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64
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65 # We’ll use only those vertices, everytime.
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66 self.buf[0] = PassthroughVertex(x, y, 0, 1)
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67 self.buf[1] = PassthroughVertex(x + width, y, 1, 1)
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68 self.buf[2] = PassthroughVertex(x, y + height, 0, 0)
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69 self.buf[3] = PassthroughVertex(x + width, y + height, 1, 0)
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70
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71 # Now we upload those vertices into a static vbo.
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72 glGenBuffers(1, &self.vbo)
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73 glBindBuffer(GL_ARRAY_BUFFER, self.vbo)
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74 glBufferData(GL_ARRAY_BUFFER, sizeof(self.buf), self.buf, GL_STATIC_DRAW)
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75
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76 # As a performance optimisation, if supported, store the rendering state into a vao.
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77 if use_vao:
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78 glGenVertexArrays(1, &self.vao)
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79 glBindVertexArray(self.vao)
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80 self.set_state()
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81 glBindVertexArray(0)
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82
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83 glBindBuffer(GL_ARRAY_BUFFER, 0)
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84
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85 if use_debug_group:
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86 glPopDebugGroup()
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87
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88 def __dealloc__(self):
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89 if use_vao:
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90 glDeleteVertexArrays(1, &self.vao)
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91 glDeleteTextures(1, &self.texture)
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92 glDeleteRenderbuffers(1, &self.rbo)
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93 glDeleteFramebuffers(1, &self.fbo)
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94 glDeleteBuffers(1, &self.vbo)
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95
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96 cpdef bind(self):
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97 glBindFramebuffer(GL_FRAMEBUFFER, self.fbo)
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98
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99 cdef void set_state(self) nogil:
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100 glBindBuffer(GL_ARRAY_BUFFER, self.vbo)
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101
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102 #TODO: find a way to use offsetof() instead of those ugly hardcoded values.
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103 glVertexAttribPointer(0, 2, GL_SHORT, False, sizeof(PassthroughVertex), <void*>0)
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104 glEnableVertexAttribArray(0)
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105 glVertexAttribPointer(1, 2, GL_FLOAT, False, sizeof(PassthroughVertex), <void*>4)
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106 glEnableVertexAttribArray(1)
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107
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108 cdef void render(self) nogil:
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109 if use_vao:
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
110 glBindVertexArray(self.vao)
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
111 else:
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
112 self.set_state()
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
113
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
114 glBindTexture(GL_TEXTURE_2D, self.texture)
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
115 glDrawArrays(GL_TRIANGLE_STRIP, 0, 4)
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
116 glBindTexture(GL_TEXTURE_2D, 0)
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
117
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
118 if use_vao:
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
119 glBindVertexArray(0)
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
120 else:
4b0593da29d5 Simplify framebuffer rendering with glDrawArrays, and move it all to its own file.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
121 glBindBuffer(GL_ARRAY_BUFFER, 0)