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annotate pytouhou/ui/opengl/shader.pyx @ 570:f0252cf111d8

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author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Thu, 10 Jul 2014 13:53:46 +0200
parents 0f2af7552462
children b8df946d394d
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1 # -*- encoding: utf-8 -*-
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2 #
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3 # Copyright Tristam Macdonald 2008.
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4 # Copyright Emmanuel Gil Peyrot 2012.
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5 #
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6 # Distributed under the Boost Software License, Version 1.0
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7 # (see http://www.boost.org/LICENSE_1_0.txt)
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8 #
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9 # Source: https://swiftcoder.wordpress.com/2008/12/19/simple-glsl-wrapper-for-pyglet/
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10 #
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11
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12 from pytouhou.lib.opengl cimport \
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13 (glCreateProgram, glCreateShader, GL_VERTEX_SHADER,
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14 GL_FRAGMENT_SHADER, glShaderSource, glCompileShader, glGetShaderiv,
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15 GL_COMPILE_STATUS, GL_INFO_LOG_LENGTH, glGetShaderInfoLog,
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16 glAttachShader, glLinkProgram, glGetProgramiv, glGetProgramInfoLog,
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17 GL_LINK_STATUS, glUseProgram, glGetUniformLocation, glUniform1fv,
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18 glUniform4fv, glUniformMatrix4fv, glBindAttribLocation)
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19
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20 from libc.stdlib cimport malloc, free
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21 from .backend cimport shader_header
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23
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24 class GLSLException(Exception):
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25 pass
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27
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28 cdef class Shader:
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29 # vert and frag take arrays of source strings the arrays will be
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30 # concattenated into one string by OpenGL
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31 def __init__(self, vert=None, frag=None):
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32 # create the program handle
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33 self.handle = glCreateProgram()
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34 # we are not linked yet
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35 self.linked = False
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36
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37 # cache the uniforms location
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38 self.location_cache = {}
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39
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40 # create the vertex shader
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41 self.create_shader(vert[0], GL_VERTEX_SHADER)
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42 # create the fragment shader
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43 self.create_shader(frag[0], GL_FRAGMENT_SHADER)
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44
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45 #TODO: put those elsewhere.
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46 glBindAttribLocation(self.handle, 0, 'in_position')
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47 glBindAttribLocation(self.handle, 1, 'in_texcoord')
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48 glBindAttribLocation(self.handle, 2, 'in_color')
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49
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50 # attempt to link the program
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51 self.link()
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52
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53 cdef void create_shader(self, const GLchar *string, GLenum shader_type):
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54 cdef GLint temp
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55 cdef const GLchar *strings[2]
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56 strings[:] = [shader_header, string]
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57
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58 # create the shader handle
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59 shader = glCreateShader(shader_type)
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60
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61 # upload the source strings
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62 glShaderSource(shader, 2, strings, NULL)
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63
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64 # compile the shader
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65 glCompileShader(shader)
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66
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67 # retrieve the compile status
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68 glGetShaderiv(shader, GL_COMPILE_STATUS, &temp)
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69
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70 # if compilation failed, print the log
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71 if not temp:
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72 # retrieve the log length
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73 glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &temp)
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74 # create a buffer for the log
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75 temp_buf = <GLchar*>malloc(temp * sizeof(GLchar))
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76 # retrieve the log text
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77 glGetShaderInfoLog(shader, temp, NULL, temp_buf)
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78 buf = temp_buf[:temp]
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79 free(temp_buf)
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80 # print the log to the console
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81 raise GLSLException(buf)
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82 else:
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83 # all is well, so attach the shader to the program
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84 glAttachShader(self.handle, shader)
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85
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86 cdef void link(self):
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87 cdef GLint temp
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88
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89 # link the program
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90 glLinkProgram(self.handle)
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91
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92 # retrieve the link status
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93 glGetProgramiv(self.handle, GL_LINK_STATUS, &temp)
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94
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95 # if linking failed, print the log
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96 if not temp:
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97 # retrieve the log length
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98 glGetProgramiv(self.handle, GL_INFO_LOG_LENGTH, &temp)
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99 # create a buffer for the log
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100 temp_buf = <GLchar*>malloc(temp * sizeof(GLchar))
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101 # retrieve the log text
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102 glGetProgramInfoLog(self.handle, temp, NULL, temp_buf)
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103 buf = temp_buf[:temp]
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104 free(temp_buf)
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105 # print the log to the console
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106 raise GLSLException(buf)
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107 else:
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108 # all is well, so we are linked
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109 self.linked = True
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110
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111 cdef GLint get_uniform_location(self, name):
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112 if name not in self.location_cache:
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113 loc = glGetUniformLocation(self.handle, name)
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114 if loc == -1:
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115 raise GLSLException('Undefined {} uniform.'.format(name))
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116 self.location_cache[name] = loc
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117 return self.location_cache[name]
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118
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119 cdef void bind(self) nogil:
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120 # bind the program
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121 glUseProgram(self.handle)
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122
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123 # upload a floating point uniform
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124 # this program must be currently bound
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125 cdef void uniform_1(self, name, GLfloat val):
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126 glUniform1fv(self.get_uniform_location(name), 1, &val)
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127
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128 # upload a vec4 uniform
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129 cdef void uniform_4(self, name, GLfloat a, GLfloat b, GLfloat c, GLfloat d):
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130 cdef GLfloat vals[4]
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131 vals[0] = a
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132 vals[1] = b
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133 vals[2] = c
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134 vals[3] = d
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135 glUniform4fv(self.get_uniform_location(name), 1, vals)
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136
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137 # upload a uniform matrix
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138 # works with matrices stored as lists,
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139 # as well as euclid matrices
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140 cdef void uniform_matrix(self, name, Matrix *mat):
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141 # obtain the uniform location
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142 loc = self.get_uniform_location(name)
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143 # uplaod the 4x4 floating point matrix
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144 glUniformMatrix4fv(loc, 1, False, <GLfloat*>mat)