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annotate pytouhou/ui/shader.pyx @ 427:0604f4fbbe3c

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Move the depth buffer clear outside of scissor, as per apitrace’s advice.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sat, 03 Aug 2013 15:48:51 +0200
parents f4d76d3d6f2a
children 878273a984c4
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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, GLint,
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19 GLuint, GLchar, GLfloat, GLenum)
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20
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21 from libc.stdlib cimport malloc, free
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22 from pytouhou.utils.matrix cimport Matrix, matrix_to_floats
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23
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24
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25 class GLSLException(Exception):
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26 pass
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27
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28
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29 cdef class Shader:
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30 cdef GLuint handle
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31 cdef bint linked
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32 cdef dict location_cache
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33
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34 # vert and frag take arrays of source strings the arrays will be
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35 # concattenated into one string by OpenGL
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36 def __init__(self, vert=None, frag=None):
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37 # create the program handle
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38 self.handle = glCreateProgram()
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39 # we are not linked yet
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40 self.linked = False
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41
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42 # cache the uniforms location
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43 self.location_cache = {}
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44
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45 # create the vertex shader
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46 self.create_shader(vert[0], GL_VERTEX_SHADER)
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47 # create the fragment shader
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48 self.create_shader(frag[0], GL_FRAGMENT_SHADER)
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49
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50 #TODO: put those elsewhere.
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51 glBindAttribLocation(self.handle, 0, 'in_position')
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52 glBindAttribLocation(self.handle, 1, 'in_texcoord')
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53 glBindAttribLocation(self.handle, 2, 'in_color')
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54
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55 # attempt to link the program
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56 self.link()
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57
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58 cdef void create_shader(self, const GLchar *string, GLenum shader_type):
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59 cdef GLint temp
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60 cdef const GLchar **strings = &string
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61
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62 # create the shader handle
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63 shader = glCreateShader(shader_type)
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64
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65 # upload the source strings
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66 glShaderSource(shader, 1, strings, NULL)
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67
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68 # compile the shader
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69 glCompileShader(shader)
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70
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71 # retrieve the compile status
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72 glGetShaderiv(shader, GL_COMPILE_STATUS, &temp)
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73
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74 # if compilation failed, print the log
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75 if not temp:
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76 # retrieve the log length
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77 glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &temp)
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78 # create a buffer for the log
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79 temp_buf = <GLchar*>malloc(temp * sizeof(GLchar))
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80 # retrieve the log text
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81 glGetShaderInfoLog(shader, temp, NULL, temp_buf)
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82 buf = temp_buf[:temp]
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83 free(temp_buf)
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84 # print the log to the console
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85 raise GLSLException(buf)
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86 else:
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87 # all is well, so attach the shader to the program
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88 glAttachShader(self.handle, shader)
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89
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90 cdef void link(self):
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91 cdef GLint temp
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92
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93 # link the program
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94 glLinkProgram(self.handle)
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95
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96 # retrieve the link status
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97 glGetProgramiv(self.handle, GL_LINK_STATUS, &temp)
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98
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99 # if linking failed, print the log
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100 if not temp:
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101 # retrieve the log length
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102 glGetProgramiv(self.handle, GL_INFO_LOG_LENGTH, &temp)
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103 # create a buffer for the log
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104 temp_buf = <GLchar*>malloc(temp * sizeof(GLchar))
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105 # retrieve the log text
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106 glGetProgramInfoLog(self.handle, temp, NULL, temp_buf)
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107 buf = temp_buf[:temp]
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108 free(temp_buf)
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109 # print the log to the console
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110 raise GLSLException(buf)
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111 else:
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112 # all is well, so we are linked
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113 self.linked = True
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114
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115 cdef GLint get_uniform_location(self, name):
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116 if name not in self.location_cache:
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117 loc = glGetUniformLocation(self.handle, name)
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118 if loc == -1:
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119 raise GLSLException('Undefined {} uniform.'.format(name))
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120 self.location_cache[name] = loc
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121 return self.location_cache[name]
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122
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123 def bind(self):
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124 # bind the program
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125 glUseProgram(self.handle)
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126
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127 # upload a floating point uniform
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128 # this program must be currently bound
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129 def uniform_1(self, name, GLfloat val):
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130 glUniform1fv(self.get_uniform_location(name), 1, &val)
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131
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132 # upload a vec4 uniform
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133 def uniform_4(self, name, GLfloat a, GLfloat b, GLfloat c, GLfloat d):
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134 cdef GLfloat vals[4]
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135 vals[0] = a
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136 vals[1] = b
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137 vals[2] = c
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138 vals[3] = d
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139 glUniform4fv(self.get_uniform_location(name), 1, vals)
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140
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141 # upload a uniform matrix
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142 # works with matrices stored as lists,
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143 # as well as euclid matrices
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144 def uniform_matrix(self, name, Matrix mat):
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145 # obtain the uniform location
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146 loc = self.get_uniform_location(name)
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147 # uplaod the 4x4 floating point matrix
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148 glUniformMatrix4fv(loc, 1, False, matrix_to_floats(mat))