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annotate pytouhou/ui/opengl/shader.pyx @ 791:a29122662cde

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utils: Simplify translate_2d and align Mat4 to 16 bytes This lowers the amount of instructions from 61 to 32 on PowerPC with AltiVec, and from 25 to 14 on amd64 with AVX2.
author Link Mauve <linkmauve@linkmauve.fr>
date Sat, 17 Jan 2026 14:19:58 +0100
parents a6af3ff86612
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 glPushDebugGroup, GL_DEBUG_SOURCE_APPLICATION, glPopDebugGroup)
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20
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21 from libc.stdlib cimport malloc, free
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22 from .backend cimport shader_header, use_debug_group
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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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28
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29 cdef class Shader:
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30 def __init__(self, vert=None, frag=None):
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31 if use_debug_group:
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32 glPushDebugGroup(GL_DEBUG_SOURCE_APPLICATION, 0, -1, "Program creation")
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33
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34 # create the program handle
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35 self.handle = glCreateProgram()
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36 # we are not linked yet
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37 self.linked = False
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38
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39 # cache the uniforms location
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40 self.location_cache = {}
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41
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42 # create the vertex shader
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43 vert_src = vert.encode()
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44 self.create_shader(vert_src, GL_VERTEX_SHADER)
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45
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46 # create the fragment shader
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47 frag_src = frag.encode()
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48 self.create_shader(frag_src, 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 if use_debug_group:
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59 glPopDebugGroup()
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60
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61 cdef bint create_shader(self, const GLchar *string, GLenum_shader shader_type) except True:
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62 cdef GLint temp
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63 cdef const GLchar *strings[2]
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64 strings[:] = [shader_header, string]
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65
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66 # create the shader handle
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67 shader = glCreateShader(shader_type)
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68
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69 # upload the source strings
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70 glShaderSource(shader, 2, strings, NULL)
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71
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72 # compile the shader
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73 glCompileShader(shader)
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74
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75 # retrieve the compile status
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76 glGetShaderiv(shader, GL_COMPILE_STATUS, &temp)
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77
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78 # if compilation failed, print the log
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79 if not temp:
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80 # retrieve the log length
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81 glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &temp)
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82 # create a buffer for the log
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83 temp_buf = <GLchar*>malloc(temp * sizeof(GLchar))
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84 # retrieve the log text
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85 glGetShaderInfoLog(shader, temp, NULL, temp_buf)
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86 buf = temp_buf[:temp]
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87 free(temp_buf)
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88 # print the log to the console
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89 raise GLSLException(buf)
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90 else:
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91 # all is well, so attach the shader to the program
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92 glAttachShader(self.handle, shader)
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93
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94 cdef bint link(self) except True:
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95 cdef GLint temp
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96
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97 # link the program
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98 glLinkProgram(self.handle)
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99
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100 # retrieve the link status
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101 glGetProgramiv(self.handle, GL_LINK_STATUS, &temp)
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102
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103 # if linking failed, print the log
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104 if not temp:
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105 # retrieve the log length
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106 glGetProgramiv(self.handle, GL_INFO_LOG_LENGTH, &temp)
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107 # create a buffer for the log
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108 temp_buf = <GLchar*>malloc(temp * sizeof(GLchar))
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109 # retrieve the log text
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110 glGetProgramInfoLog(self.handle, temp, NULL, temp_buf)
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111 buf = temp_buf[:temp]
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112 free(temp_buf)
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113 # print the log to the console
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114 raise GLSLException(buf)
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115 else:
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116 # all is well, so we are linked
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117 self.linked = True
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118
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119 cdef GLint get_uniform_location(self, name) except -1:
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120 if isinstance(name, str):
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121 name = name.encode()
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122 if name not in self.location_cache:
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123 loc = glGetUniformLocation(self.handle, name)
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124 if loc == -1:
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125 raise GLSLException('Undefined {} uniform.'.format(name))
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126 self.location_cache[name] = loc
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127 return self.location_cache[name]
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128
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129 cdef void bind(self) nogil:
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130 # bind the program
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131 glUseProgram(self.handle)
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132
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133 # upload a floating point uniform
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134 # this program must be currently bound
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135 cdef bint uniform_1(self, name, GLfloat val) except True:
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136 glUniform1fv(self.get_uniform_location(name), 1, &val)
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137
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138 # upload a vec4 uniform
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139 cdef bint uniform_4(self, name, GLfloat a, GLfloat b, GLfloat c, GLfloat d) except True:
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140 cdef GLfloat vals[4]
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141 vals[0] = a
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142 vals[1] = b
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143 vals[2] = c
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144 vals[3] = d
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145 glUniform4fv(self.get_uniform_location(name), 1, vals)
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146
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147 # upload a uniform matrix
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148 # works with matrices stored as lists,
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149 # as well as euclid matrices
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150 cdef bint uniform_matrix(self, name, Matrix *mat) except True:
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151 # obtain the uniform location
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152 loc = self.get_uniform_location(name)
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153 # uplaod the 4x4 floating point matrix
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154 glUniformMatrix4fv(loc, 1, False, <GLfloat*>mat)