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"""OpenGL shader program wrapper.
"""
import numpy as np
import os
import re
import OpenGL
from OpenGL.GL import *
from OpenGL.GL import shaders as gl_shader_utils
class ShaderProgramCache(object):
"""A cache for shader programs.
"""
def __init__(self, shader_dir=None):
self._program_cache = {}
self.shader_dir = shader_dir
if self.shader_dir is None:
base_dir, _ = os.path.split(os.path.realpath(__file__))
self.shader_dir = os.path.join(base_dir, 'shaders')
def get_program(self, vertex_shader, fragment_shader,
geometry_shader=None, defines=None):
"""Get a program via a list of shader files to include in the program.
Parameters
----------
vertex_shader : str
The vertex shader filename.
fragment_shader : str
The fragment shader filename.
geometry_shader : str
The geometry shader filename.
defines : dict
Defines and their values for the shader.
Returns
-------
program : :class:`.ShaderProgram`
The program.
"""
shader_names = []
if defines is None:
defines = {}
shader_filenames = [
x for x in [vertex_shader, fragment_shader, geometry_shader]
if x is not None
]
for fn in shader_filenames:
if fn is None:
continue
_, name = os.path.split(fn)
shader_names.append(name)
cid = OpenGL.contextdata.getContext()
key = tuple([cid] + sorted(
[(s,1) for s in shader_names] + [(d, defines[d]) for d in defines]
))
if key not in self._program_cache:
shader_filenames = [
os.path.join(self.shader_dir, fn) for fn in shader_filenames
]
if len(shader_filenames) == 2:
shader_filenames.append(None)
vs, fs, gs = shader_filenames
self._program_cache[key] = ShaderProgram(
vertex_shader=vs, fragment_shader=fs,
geometry_shader=gs, defines=defines
)
return self._program_cache[key]
def clear(self):
for key in self._program_cache:
self._program_cache[key].delete()
self._program_cache = {}
class ShaderProgram(object):
"""A thin wrapper about OpenGL shader programs that supports easy creation,
binding, and uniform-setting.
Parameters
----------
vertex_shader : str
The vertex shader filename.
fragment_shader : str
The fragment shader filename.
geometry_shader : str
The geometry shader filename.
defines : dict
Defines and their values for the shader.
"""
def __init__(self, vertex_shader, fragment_shader,
geometry_shader=None, defines=None):
self.vertex_shader = vertex_shader
self.fragment_shader = fragment_shader
self.geometry_shader = geometry_shader
self.defines = defines
if self.defines is None:
self.defines = {}
self._program_id = None
self._vao_id = None # PYOPENGL BUG
# DEBUG
# self._unif_map = {}
def _add_to_context(self):
if self._program_id is not None:
raise ValueError('Shader program already in context')
shader_ids = []
# Load vert shader
shader_ids.append(gl_shader_utils.compileShader(
self._load(self.vertex_shader), GL_VERTEX_SHADER)
)
# Load frag shader
shader_ids.append(gl_shader_utils.compileShader(
self._load(self.fragment_shader), GL_FRAGMENT_SHADER)
)
# Load geometry shader
if self.geometry_shader is not None:
shader_ids.append(gl_shader_utils.compileShader(
self._load(self.geometry_shader), GL_GEOMETRY_SHADER)
)
# Bind empty VAO PYOPENGL BUG
if self._vao_id is None:
self._vao_id = glGenVertexArrays(1)
glBindVertexArray(self._vao_id)
# Compile program
self._program_id = gl_shader_utils.compileProgram(*shader_ids)
# Unbind empty VAO PYOPENGL BUG
glBindVertexArray(0)
def _in_context(self):
return self._program_id is not None
def _remove_from_context(self):
if self._program_id is not None:
glDeleteProgram(self._program_id)
glDeleteVertexArrays(1, [self._vao_id])
self._program_id = None
self._vao_id = None
def _load(self, shader_filename):
path, _ = os.path.split(shader_filename)
with open(shader_filename) as f:
text = f.read()
def ifdef(matchobj):
if matchobj.group(1) in self.defines:
return '#if 1'
else:
return '#if 0'
def ifndef(matchobj):
if matchobj.group(1) in self.defines:
return '#if 0'
else:
return '#if 1'
ifdef_regex = re.compile(
'#ifdef\\s+([a-zA-Z_][a-zA-Z_0-9]*)\\s*$', re.MULTILINE
)
ifndef_regex = re.compile(
'#ifndef\\s+([a-zA-Z_][a-zA-Z_0-9]*)\\s*$', re.MULTILINE
)
text = re.sub(ifdef_regex, ifdef, text)
text = re.sub(ifndef_regex, ifndef, text)
for define in self.defines:
value = str(self.defines[define])
text = text.replace(define, value)
return text
def _bind(self):
"""Bind this shader program to the current OpenGL context.
"""
if self._program_id is None:
raise ValueError('Cannot bind program that is not in context')
# glBindVertexArray(self._vao_id)
glUseProgram(self._program_id)
def _unbind(self):
"""Unbind this shader program from the current OpenGL context.
"""
glUseProgram(0)
def delete(self):
"""Delete this shader program from the current OpenGL context.
"""
self._remove_from_context()
def set_uniform(self, name, value, unsigned=False):
"""Set a uniform value in the current shader program.
Parameters
----------
name : str
Name of the uniform to set.
value : int, float, or ndarray
Value to set the uniform to.
unsigned : bool
If True, ints will be treated as unsigned values.
"""
try:
# DEBUG
# self._unif_map[name] = 1, (1,)
loc = glGetUniformLocation(self._program_id, name)
if loc == -1:
raise ValueError('Invalid shader variable: {}'.format(name))
if isinstance(value, np.ndarray):
# DEBUG
# self._unif_map[name] = value.size, value.shape
if value.ndim == 1:
if (np.issubdtype(value.dtype, np.unsignedinteger) or
unsigned):
dtype = 'u'
value = value.astype(np.uint32)
elif np.issubdtype(value.dtype, np.integer):
dtype = 'i'
value = value.astype(np.int32)
else:
dtype = 'f'
value = value.astype(np.float32)
self._FUNC_MAP[(value.shape[0], dtype)](loc, 1, value)
else:
self._FUNC_MAP[(value.shape[0], value.shape[1])](
loc, 1, GL_TRUE, value
)
# Call correct uniform function
elif isinstance(value, float):
glUniform1f(loc, value)
elif isinstance(value, int):
if unsigned:
glUniform1ui(loc, value)
else:
glUniform1i(loc, value)
elif isinstance(value, bool):
if unsigned:
glUniform1ui(loc, int(value))
else:
glUniform1i(loc, int(value))
else:
raise ValueError('Invalid data type')
except Exception:
pass
_FUNC_MAP = {
(1,'u'): glUniform1uiv,
(2,'u'): glUniform2uiv,
(3,'u'): glUniform3uiv,
(4,'u'): glUniform4uiv,
(1,'i'): glUniform1iv,
(2,'i'): glUniform2iv,
(3,'i'): glUniform3iv,
(4,'i'): glUniform4iv,
(1,'f'): glUniform1fv,
(2,'f'): glUniform2fv,
(3,'f'): glUniform3fv,
(4,'f'): glUniform4fv,
(2,2): glUniformMatrix2fv,
(2,3): glUniformMatrix2x3fv,
(2,4): glUniformMatrix2x4fv,
(3,2): glUniformMatrix3x2fv,
(3,3): glUniformMatrix3fv,
(3,4): glUniformMatrix3x4fv,
(4,2): glUniformMatrix4x2fv,
(4,3): glUniformMatrix4x3fv,
(4,4): glUniformMatrix4fv,
}
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