def create_shader(target, source_path): # read shader source source_file = open(source_path, "rb") source = source_file.read() source_file.close() source_length = ctypes.c_int(len(source) + 1) source_buffer = ctypes.create_string_buffer(source) buffer_pointer = ctypes.cast( ctypes.pointer(ctypes.pointer(source_buffer)), ctypes.POINTER(ctypes.POINTER(ctypes.c_char))) # compile shader gl.glShaderSource(target, 1, buffer_pointer, ctypes.byref(source_length)) gl.glCompileShader(target) # handle potential errors log_length = gl.GLint(0) gl.glGetShaderiv(target, gl.GL_INFO_LOG_LENGTH, ctypes.byref(log_length)) log_buffer = ctypes.create_string_buffer(log_length.value) gl.glGetShaderInfoLog(target, log_length, None, log_buffer) if log_length: raise Shader_error(str(log_buffer.value))
def __init__(self, source, shader_type):
self.__value = None
type_dict = {"vert": gl.GL_VERTEX_SHADER, "geom": gl.GL_GEOMETRY_SHADER, "frag": gl.GL_FRAGMENT_SHADER}
# create and compile shader
shader = gl.glCreateShader(type_dict[shader_type])
source_ptr = ct.c_char_p(source)
source_ptr_ptr = ct.cast(ct.pointer(source_ptr), ct.POINTER(ct.POINTER(ct.c_char)))
gl.glShaderSource(shader, 1, source_ptr_ptr, None)
gl.glCompileShader(shader)
# check for error
err_status = ct.c_int()
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, ct.byref(err_status))
if err_status.value != gl.GL_TRUE:
# error occurred
log_length = ct.c_int()
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH, ct.byref(log_length))
log_buffer = (ct.c_char * log_length.value)()
log_buffer_ptr = ct.cast(ct.pointer(log_buffer), ct.c_char_p)
gl.glGetShaderInfoLog(shader, log_length.value, None, log_buffer_ptr)
gl.glDeleteShader(shader)
raise gl.GLException("Shader failed to compile: \n%s" % log_buffer.value)
else:
self.__value = shader
def createShader(self, strings, shadertype):
# create the shader handle
shader = gl.glCreateShader(shadertype)
# convert the source strings into a ctypes pointer-to-char array, and upload them
# this is deep, dark, dangerous black magick - don't try stuff like this at home!
strings = tuple(s.encode('ascii') for s in strings) # Nick added, for python3
src = (c_char_p * len(strings))(*strings)
gl.glShaderSource(shader, len(strings), cast(pointer(src), POINTER(POINTER(c_char))), None)
# compile the shader
gl.glCompileShader(shader)
# retrieve the compile status
compile_success = c_int(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, byref(compile_success))
# if compilation failed, print the log
if compile_success:
gl.glAttachShader(self.id, shader)
else:
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH, byref(compile_success)) # retrieve the log length
buffer = create_string_buffer(compile_success.value) # create a buffer for the log
gl.glGetShaderInfoLog(shader, compile_success, None, buffer) # retrieve the log text
print(buffer.value) # print the log to the console
def createShader(self, strings, type):
count = len(strings)
#If no code
if count < 1:
return
shader = gl.glCreateShader(type)
# ctypes magic: convert python [strings] to C (char**).
src = (c_char_p * count)(*strings)
gl.glShaderSource(shader, count,
cast(pointer(src), POINTER(POINTER(c_char))), None)
gl.glCompileShader(shader)
# Retrieve the compile status
status = c_int(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, byref(status))
# If compilation failed, get log and abort.
if not status:
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH, byref(status))
log = create_string_buffer(status.value)
gl.glGetShaderInfoLog(shader, status, None, log)
raise Exception("Compiling shaders failed: {0}".format(log.value))
else:
# If all is well, attach the shader to the program
gl.glAttachShader(self.handle, shader)
def shader(stype, src):
'''
create and compile a shader of type stype with source code src
return the shader (the return value of glCreateShader)
'''
handle = gl.glCreateShader(stype)
buffer = ctypes.create_string_buffer(src)
buf_pointer = ctypes.cast(ctypes.pointer(ctypes.pointer(buffer)),
ctypes.POINTER(ctypes.POINTER(ctypes.c_char)))
length = ctypes.c_int(len(src) + 1)
gl.glShaderSource(handle, 1, buf_pointer, ctypes.byref(length))
gl.glCompileShader(handle)
success = gl.GLint(0)
gl.glGetShaderiv(handle, gl.GL_COMPILE_STATUS, ctypes.pointer(success))
length = gl.GLint(0)
gl.glGetShaderiv(handle, gl.GL_INFO_LOG_LENGTH, ctypes.pointer(length))
buffer = ctypes.create_string_buffer(length.value)
gl.glGetShaderInfoLog(handle, length, None, buffer)
log = buffer.value[:length.value].decode('ascii')
for line in log.splitlines():
logging.debug('GLSL: ' + line)
if not success:
raise Exception('Compiling of the shader failed.')
return handle
def createShader(self, strings, shadertype):
# create the shader handle
shader = gl.glCreateShader(shadertype)
# convert the source strings into a ctypes pointer-to-char array, and upload them
# this is deep, dark, dangerous black magick - don't try stuff like this at home!
strings = tuple(s.encode('ascii')
for s in strings) # Nick added, for python3
src = (c_char_p * len(strings))(*strings)
gl.glShaderSource(shader, len(strings),
cast(pointer(src), POINTER(POINTER(c_char))), None)
# compile the shader
gl.glCompileShader(shader)
# retrieve the compile status
compile_success = c_int(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, byref(compile_success))
# if compilation failed, print the log
if compile_success:
gl.glAttachShader(self.id, shader)
else:
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH,
byref(compile_success)) # retrieve the log length
buffer = create_string_buffer(
compile_success.value) # create a buffer for the log
gl.glGetShaderInfoLog(shader, compile_success, None,
buffer) # retrieve the log text
print(buffer.value) # print the log to the console
def compile_shader(shader_type, shader_source):
'''
Compile a shader and print error messages.
'''
shader_name = gl.glCreateShader(shader_type)
src_buffer = ctypes.create_string_buffer(shader_source)
buf_pointer = ctypes.cast(ctypes.pointer(ctypes.pointer(src_buffer)), ctypes.POINTER(ctypes.POINTER(ctypes.c_char)))
length = ctypes.c_int(len(shader_source) + 1)
gl.glShaderSource(shader_name, 1, buf_pointer, ctypes.byref(length))
gl.glCompileShader(shader_name)
# test if compilation is succesful and print status messages
success = gl.GLint(0)
gl.glGetShaderiv(shader_name, gl.GL_COMPILE_STATUS, ctypes.byref(success))
length = gl.GLint(0)
gl.glGetShaderiv(shader_name, gl.GL_INFO_LOG_LENGTH, ctypes.byref(length))
log_buffer = ctypes.create_string_buffer(length.value)
gl.glGetShaderInfoLog(shader_name, length, None, log_buffer)
for line in log_buffer.value[:length.value].decode('ascii').splitlines():
print('GLSL: ' + line)
assert success, 'Compiling of the shader failed.'
return shader_name
def compile_shader(source: str, shader_type: gl.GLenum) -> gl.GLuint:
"""Compile the shader code of the given type.
`shader_type` could be GL_VERTEX_SHADER, GL_FRAGMENT_SHADER, ...
Returns the shader id as a GLuint
"""
shader = gl.glCreateShader(shader_type)
source_bytes = source.encode('utf-8')
# Turn the source code string into an array of c_char_p arrays.
strings = byref(cast(c_char_p(source_bytes), POINTER(c_char)))
# Make an array with the strings lengths
lengths = pointer(c_int(len(source_bytes)))
gl.glShaderSource(shader, 1, strings, lengths)
gl.glCompileShader(shader)
result = c_int()
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, byref(result))
if result.value == gl.GL_FALSE:
msg = create_string_buffer(512)
length = c_int()
gl.glGetShaderInfoLog(shader, 512, byref(length), msg)
raise ShaderException(
f"Shader compile failure ({result.value}): {msg.value.decode('utf-8')}"
)
return shader
def check_shader(shader, filename):
"""check_shader(shader, filename)
Raises a RuntimeError if the shader hasn't compiled correctly."""
# See if the shader compiled correctly
compile_ok = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS,
c.pointer(compile_ok))
# If the compilation fails, get the error description from OpenGL
# and raise it
if not compile_ok:
log_len = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH,
c.pointer(log_len))
log_buf = c.create_string_buffer(log_len.value)
gl.glGetShaderInfoLog(shader, log_len, None, log_buf)
raise RuntimeError(
"Shader from %s could not compile: %s" % (
filename, log_buf.value))
def compile_shader(source: str, shader_type: gl.GLenum) -> gl.GLuint:
"""Compile the shader code of the given type.
`shader_type` could be GL_VERTEX_SHADER, GL_FRAGMENT_SHADER, ...
Returns the shader id as a GLuint
"""
shader = gl.glCreateShader(shader_type)
source_bytes = source.encode("utf-8")
# Turn the source code string into an array of c_char_p arrays.
strings = byref(cast(c_char_p(source_bytes), POINTER(c_char)))
# Make an array with the strings lengths
lengths = pointer(c_int(len(source_bytes)))
gl.glShaderSource(shader, 1, strings, lengths)
gl.glCompileShader(shader)
result = c_int()
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, byref(result))
if result.value == gl.GL_FALSE:
msg = create_string_buffer(512)
length = c_int()
gl.glGetShaderInfoLog(shader, 512, byref(length), msg)
raise ShaderException(
(f"Error compiling {SHADER_TYPE_NAMES[shader_type]} "
f"({result.value}): {msg.value.decode('utf-8')}\n"
f"---- [{SHADER_TYPE_NAMES[shader_type]}] ---\n") +
"\n".join(f"{str(i+1).zfill(3)}: {line} "
for i, line in enumerate(source.split("\n"))))
return shader
def compile_shader(shader_type, shader_source):
'''
Compile a shader and print error messages.
'''
shader_name = gl.glCreateShader(shader_type)
src_buffer = ctypes.create_string_buffer(shader_source)
buf_pointer = ctypes.cast(ctypes.pointer(ctypes.pointer(src_buffer)),
ctypes.POINTER(ctypes.POINTER(ctypes.c_char)))
length = ctypes.c_int(len(shader_source) + 1)
gl.glShaderSource(shader_name, 1, buf_pointer, ctypes.byref(length))
gl.glCompileShader(shader_name)
# test if compilation is succesful and print status messages
success = gl.GLint(0)
gl.glGetShaderiv(shader_name, gl.GL_COMPILE_STATUS, ctypes.byref(success))
length = gl.GLint(0)
gl.glGetShaderiv(shader_name, gl.GL_INFO_LOG_LENGTH, ctypes.byref(length))
log_buffer = ctypes.create_string_buffer(length.value)
gl.glGetShaderInfoLog(shader_name, length, None, log_buffer)
log_message = log_buffer.value[:length.value].decode('ascii').strip()
if log_message:
sys.stderr.write(log_message + '\n')
if not success:
raise ValueError('Compiling of the shader failed.')
return shader_name
def get_info_log(self):
length = self.get_info_log_length()
if length == 0:
return ''
buffer = create_string_buffer(length)
gl.glGetShaderInfoLog(self.id, length, None, buffer)
return buffer.value
def compile_shader(shader_type, shader_source):
'''
Compile a shader and print error messages.
'''
shader_name = gl.glCreateShader(shader_type)
src_buffer = ctypes.create_string_buffer(shader_source)
buf_pointer = ctypes.cast(ctypes.pointer(ctypes.pointer(src_buffer)),
ctypes.POINTER(ctypes.POINTER(ctypes.c_char)))
length = ctypes.c_int(len(shader_source) + 1)
gl.glShaderSource(shader_name, 1, buf_pointer, ctypes.byref(length))
gl.glCompileShader(shader_name)
# test if compilation is succesful and print status messages
success = gl.GLint(0)
gl.glGetShaderiv(shader_name, gl.GL_COMPILE_STATUS, ctypes.byref(success))
length = gl.GLint(0)
gl.glGetShaderiv(shader_name, gl.GL_INFO_LOG_LENGTH, ctypes.byref(length))
log_buffer = ctypes.create_string_buffer(length.value)
gl.glGetShaderInfoLog(shader_name, length, None, log_buffer)
for line in log_buffer.value[:length.value].decode('ascii').splitlines():
print('GLSL: ' + line)
assert success, 'Compiling of the shader failed.'
return shader_name
def __init__(self, shader_type, source):
if shader_type not in GLShader.shader_type_name:
raise ValueError
self._shader_type = shader_type
self._source = source
super().__init__(gl.glCreateShader(shader_type))
if isinstance(source, str):
source = source.encode()
if not isinstance(source, bytes):
raise TypeError
c_source = ctypes.create_string_buffer(source)
c_source = ctypes.cast(
ctypes.pointer(ctypes.pointer(c_source)),
ctypes.POINTER(ctypes.POINTER(gl.GLchar)),
)
gl.glShaderSource(self.gl_id, 1, c_source, None)
gl.glCompileShader(self.gl_id)
rc = gl.GLint(0)
gl.glGetShaderiv(self.gl_id, gl.GL_COMPILE_STATUS, ctypes.byref(rc))
if not rc:
gl.glGetShaderiv(self.gl_id, gl.GL_INFO_LOG_LENGTH,
ctypes.byref(rc))
buffer = ctypes.create_string_buffer(rc.value)
gl.glGetShaderInfoLog(self.gl_id, rc, None, buffer)
raise GLObjectException("{}\n{}".format(
GLShader.shader_type_name[shader_type], buffer.value.decode()))
def get_info_log(self):
length = self.get_info_log_length()
if length == 0:
return ''
buffer = create_string_buffer(length)
gl.glGetShaderInfoLog(self.id, length, None, buffer)
return buffer.value
def compile_and_attach_shader(self, shader_files, shader_type):
"""
Parameters
----------
:shader_files: a list of shader files.
:shader_type: `GL_VERTEX_SHADER` or `GL_FRAGMENT_SHADER`.
Main steps to compile and attach a shader:
1. glCreateShader:
create a shader of given type.
2. glShaderSource:
load source code into the shader.
3. glCompileShader:
compile the shader.
4. glGetShaderiv:
retrieve the compiling status.
5. glGetShaderInfoLog:
print the error info if compiling failed.
6. glAttachShader:
attach the shader to our program if compiling succeeded.
"""
src = []
for src_f in shader_files:
with open(src_f, "r") as f:
src.append(f.read().encode("ascii"))
# 1. create a shader
shader = gl.glCreateShader(shader_type)
# 2. load source code into the shader
src_p = (ct.c_char_p * len(src))(*src)
gl.glShaderSource(
shader,
len(src),
ct.cast(ct.pointer(src_p), ct.POINTER(ct.POINTER(ct.c_char))),
None,
)
# 3. compile the shader
gl.glCompileShader(shader)
# 4. retrieve the compiling status
compile_status = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS,
ct.byref(compile_status))
# 5. if compiling failed then print the error log
if not compile_status:
info_length = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH,
ct.byref(info_length))
error_info = ct.create_string_buffer(info_length.value)
gl.glGetShaderInfoLog(shader, info_length, None, error_info)
print(error_info.value.decode("ascii"))
# 6. else attach the shader to our program
else:
gl.glAttachShader(self.program, shader)
gl.glDeleteShader(shader)
def print_log(shader):
length = c_int()
GL.glGetShaderiv(shader, GL.GL_INFO_LOG_LENGTH, byref(length))
if length.value > 0:
log = create_string_buffer(length.value)
GL.glGetShaderInfoLog(shader, length, byref(length), log)
print >> sys.stderr, log.value
def print_log(shader):
length = c_int()
GL.glGetShaderiv(shader, GL.GL_INFO_LOG_LENGTH, byref(length))
if length.value > 0:
log = create_string_buffer(length.value)
GL.glGetShaderInfoLog(shader, length, byref(length), log)
print >> sys.stderr, log.value
def was_compile_successful(self, shader):
status = c_int(0)
glGetShaderiv(shader, GL_COMPILE_STATUS, byref(status))
if not status:
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, byref(status))
buffer = create_string_buffer(status.value)
glGetShaderInfoLog(shader, status, None, buffer)
self.log.error(f"{buffer.value}")
return status
def compile_and_attach_shader(self, source_strings, shader_type):
'''
source_strings:
a list of one or more strings that are possibly read from some files.
shader_type:
must be one of gl.GL_VERTEX_SHADER, gl.GL_FRAGMENT_SHADER, gl.GL_GEOMETRY_SHADER
main steps to compile and attach a shader:
1. glCreateShader:
create a shader of given type
2. glShaderSource:
load source code into the shader
3. glCompileShader:
compile the shader
4. glGetShaderiv:
retrieve the compile status
5. glGetShaderInfoLog:
print the error info if compiling failed
6. glAttachShader:
attach the shader to our program if compiling successed
'''
# a preprocessing to make the code compatible with python3.
src = tuple(s.encode('ascii') for s in source_strings)
# 1. create a shader
shader = gl.glCreateShader(shader_type)
# 2. load source code into the shader
src_p = (ct.c_char_p * len(src))(*src)
gl.glShaderSource(
shader, len(src),
ct.cast(ct.pointer(src_p), ct.POINTER(ct.POINTER(ct.c_char))),
None)
# 3. compile the shader
gl.glCompileShader(shader)
# 4. retrieve the compile status
compile_status = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS,
ct.byref(compile_status))
# 5. if compiling failed then print the error log
if not compile_status:
info_length = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH,
ct.byref(info_length))
error_info = ct.create_string_buffer(info_length.value)
gl.glGetShaderInfoLog(shader, info_length, None, error_info)
print(error_info.value)
# 6. else attach the shader to our program
else:
gl.glAttachShader(self.program, shader)
def __init__(self, source="", type='vertex'):
"""
Vertex, Fragment, or Geometry shader.
Parameters
----------
source : string or list
String or list of strings. The GLSL source code for the shader.
type : {'vertex', 'fragment', 'geometry'}
Type of shader.
"""
shader_type = {'vertex': gl.GL_VERTEX_SHADER,
'fragment': gl.GL_FRAGMENT_SHADER,}
## 'geometry': gl.GL_GEOMETRY_SHADER}
if isinstance(source, basestring):
source = [source]
count = len(source)
# if we have no source code, ignore this shader
if count < 1:
raise GLSLError("No GLSL source provided.")
# create the shader handle
shader = gl.glCreateShader(shader_type[type])
# convert the source strings into a ctypes pointer-to-char array,
# and upload them. This is deep, dark, dangerous black magick -
# don't try stuff like this at home!
src = (c_char_p * count)(*source)
gl.glShaderSource(shader, count,
cast(pointer(src), POINTER(POINTER(c_char))),
None)
# compile the shader
gl.glCompileShader(shader)
temp = c_int(0)
# retrieve the compile status
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, byref(temp))
# if compilation failed, print the log
if not temp:
# retrieve the log length
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH, byref(temp))
# create a buffer for the log
buffer = create_string_buffer(temp.value)
# retrieve the log text
gl.glGetShaderInfoLog(shader, temp, None, buffer)
# print the log to the console
raise GLSLError(buffer.value)
self.handle = shader
self.source = "\n".join(source)
def compile_and_attach_shader(self, source_strings, shader_type):
'''
source_strings:
a list of one or more strings that are possibly read from some files.
shader_type:
must be one of gl.GL_VERTEX_SHADER, gl.GL_FRAGMENT_SHADER, gl.GL_GEOMETRY_SHADER
main steps to compile and attach a shader:
1. glCreateShader:
create a shader of given type
2. glShaderSource:
load source code into the shader
3. glCompileShader:
compile the shader
4. glGetShaderiv:
retrieve the compile status
5. glGetShaderInfoLog:
print the error info if compiling failed
6. glAttachShader:
attach the shader to our program if compiling successed
'''
# a preprocessing to make the code compatible with python3.
src = tuple(s.encode('ascii') for s in source_strings)
# 1. create a shader
shader = gl.glCreateShader(shader_type)
# 2. load source code into the shader
src_p = (ct.c_char_p * len(src))(*src)
gl.glShaderSource(shader, len(src), ct.cast(ct.pointer(src_p), ct.POINTER(ct.POINTER(ct.c_char))), None)
# 3. compile the shader
gl.glCompileShader(shader)
# 4. retrieve the compile status
compile_status = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, ct.byref(compile_status))
# 5. if compiling failed then print the error log
if not compile_status:
info_length = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH, ct.byref(info_length))
error_info = ct.create_string_buffer(info_length.value)
gl.glGetShaderInfoLog(shader, info_length, None, error_info)
print(error_info.value)
# 6. else attach the shader to our program
else:
gl.glAttachShader(self.program, shader)
def compile_and_attach_shader(self, shader_file, shader_type):
"""Main steps to compile and attach a shader:
1. glCreateShader:
create a shader of given type.
2. glShaderSource:
load source code into the shader.
3. glCompileShader:
compile the shader.
4. glGetShaderiv:
retrieve the compile status.
5. glGetShaderInfoLog:
print the error info if compiling failed.
6. glAttachShader:
attach the shader to our program if compiling successed.
"""
with open(shader_file, 'r') as f:
src = f.read().encode('ascii')
# 1. create a shader
shader = gl.glCreateShader(shader_type)
# 2. load source code into the shader
src_p = ct.c_char_p(src)
gl.glShaderSource(
shader, 1,
ct.cast(ct.pointer(src_p), ct.POINTER(ct.POINTER(ct.c_char))),
None)
# 3. compile the shader
gl.glCompileShader(shader)
# 4. retrieve the compile status
compile_status = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS,
ct.byref(compile_status))
# 5. if compiling failed then print the error log
if not compile_status:
info_length = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH,
ct.byref(info_length))
error_info = ct.create_string_buffer(info_length.value)
gl.glGetShaderInfoLog(shader, info_length, None, error_info)
print(error_info.value)
# 6. else attach the shader to our program
else:
gl.glAttachShader(self.program, shader)
def _log_error(self):
log_length = gl.GLint(0)
gl.glGetShaderiv(self.name, gl.GL_INFO_LOG_LENGTH, byref(log_length))
log_buffer = create_string_buffer(log_length.value)
gl.glGetShaderInfoLog(self.name, log_length.value, None, log_buffer)
self.logger.error("Error compiling GLSL (type %s) shader!", self.kind)
self.logger.error("---Shader---")
self.logger.error("\n".join(
f"{i+1: 3d}: {line}" for i, line in enumerate(
self.source.decode("ascii").splitlines())))
self.logger.error("---Message---")
for line in log_buffer.value[:log_length.value].decode(
'ascii').splitlines():
self.logger.error('GLSL: ' + line)
self.logger.error("------")
def compile_and_attach_shader(self, shader_file, shader_type):
"""Main steps to compile and attach a shader:
1. glCreateShader:
create a shader of given type.
2. glShaderSource:
load source code into the shader.
3. glCompileShader:
compile the shader.
4. glGetShaderiv:
retrieve the compile status.
5. glGetShaderInfoLog:
print the error info if compiling failed.
6. glAttachShader:
attach the shader to our program if compiling successed.
"""
with open(shader_file, 'r') as f:
src = f.read().encode('ascii')
# 1. create a shader
shader = gl.glCreateShader(shader_type)
# 2. load source code into the shader
src_p = ct.c_char_p(src)
gl.glShaderSource(shader, 1, ct.cast(ct.pointer(src_p), ct.POINTER(ct.POINTER(ct.c_char))), None)
# 3. compile the shader
gl.glCompileShader(shader)
# 4. retrieve the compile status
compile_status = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, ct.byref(compile_status))
# 5. if compiling failed then print the error log
if not compile_status:
info_length = gl.GLint(0)
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH, ct.byref(info_length))
error_info = ct.create_string_buffer(info_length.value)
gl.glGetShaderInfoLog(shader, info_length, None, error_info)
print(error_info.value)
# 6. else attach the shader to our program
else:
gl.glAttachShader(self.program, shader)
def compile_shader(type_, src):
shader = gl.glCreateShader(type_)
gl.glShaderSource(
shader,
1,
ctypes.cast(
ctypes.pointer(ctypes.pointer(ctypes.create_string_buffer(src))),
ctypes.POINTER(ctypes.POINTER(ctypes.c_char)),
),
ctypes.byref(ctypes.c_int(len(src) + 1)),
)
gl.glCompileShader(shader)
status = ctypes.c_int(0)
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, ctypes.byref(status))
if not status.value:
log = ctypes.create_string_buffer(4096)
gl.glGetShaderInfoLog(shader, len(log), None, log)
raise Exception('Error compiling shader: ' + log.value.decode('utf8'))
return shader
def _compile(self, source, kind):
"""Compile a shader from its source code.
:param source: Source code of the shader to be compiled.
:type source: str
:param kind: The kind of shader we are compiling.
:type kind: int
:returns: The shader id of the compiled shader.
:rtype: int
"""
shader_id = gl.glCreateShader(kind)
_src = ct.c_char_p(source.encode('utf-8'))
src = ct.cast(ct.pointer(_src), ct.POINTER(ct.POINTER(ct.c_char)))
gl.glShaderSource(shader_id, 1, src, None)
gl.glCompileShader(shader_id)
status_code = ct.c_int(0)
status_code_pointer = ct.pointer(status_code)
gl.glGetShaderiv(shader_id, gl.GL_COMPILE_STATUS, status_code_pointer)
log_size = ct.c_int(0)
log_size_pointer = ct.pointer(log_size)
gl.glGetShaderiv(shader_id, gl.GL_INFO_LOG_LENGTH, log_size_pointer)
log_message = ct.create_string_buffer(log_size.value)
gl.glGetShaderInfoLog(shader_id, log_size, None, log_message)
log_message = log_message.value.decode('utf-8')
if len(log_message) > 0:
print(source)
print(log_message)
# In Windows (OpenGL 3.3 + intel card) the log_message
# is set to "No errors" on a successful compilation
# and the code raises the Exception even though it
# shouldn't. There should be a proper fix, but getting
# rid of this line for now, will fix it.
#
# raise Exception(log_message)
return shader_id
def shader(stype, src):
handle = gl.glCreateShader(stype)
buffer = ctypes.create_string_buffer(src)
buf_pointer = ctypes.cast(ctypes.pointer(ctypes.pointer(buffer)), POINTER(POINTER(ctypes.c_char)))
length = ctypes.c_int(len(src) + 1)
gl.glShaderSource(handle, 1, buf_pointer, byref(length))
gl.glCompileShader(handle)
success = gl.GLint(0)
gl.glGetShaderiv(handle, gl.GL_COMPILE_STATUS, pointer(success))
length = gl.GLint(0)
gl.glGetShaderiv(handle, gl.GL_INFO_LOG_LENGTH, pointer(length))
buffer = ctypes.create_string_buffer(length.value)
gl.glGetShaderInfoLog(handle, length, None, buffer)
log = buffer.value[:length.value].decode('ascii')
for line in log.splitlines():
logging.debug('GLSL: ' + line)
if not success:
raise Exception('Compiling of the shader failed.')
return handle
def create_shader(self, strings, shader_type):
count = len(strings)
# if we have no source code, ignore this shader
if count < 1:
return
# create the shader handle
shader = glCreateShader(shader_type)
shaderstrings = []
for string in strings:
shaderstrings.append(bytes(string, 'ascii'))
# convert the source strings into a ctypes pointer-to-char array, and
# upload them this is deep, dark, dangerous black magic - don't try
# stuff like this at home!
src = (c_char_p * count)(*shaderstrings)
glShaderSource(shader, count, cast(
pointer(src), POINTER(POINTER(c_char))), None)
# compile the shader
glCompileShader(shader)
temp = c_int(0)
# retrieve the compile status
glGetShaderiv(shader, GL_COMPILE_STATUS, byref(temp))
# if compilation failed, print the log
if not temp:
# retrieve the log length
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, byref(temp))
# create a buffer for the log
buffer = create_string_buffer(temp.value)
# retrieve the log text
glGetShaderInfoLog(shader, temp, None, buffer)
# print the log to the console
print(buffer.value)
else:
# all is well, so attach the shader to the program
glAttachShader(self.handle, shader)
def print_error(message):
nonlocal error
error = True
status = GLint()
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, byref(status))
output = create_string_buffer(status.value)
glGetShaderInfoLog(shader, status, None, output)
shader_source = '\n'.join([
'{:<3} | '.format(row) + line
for row, line in enumerate(shader.source.splitlines(), start=1)
])
print(message,
output.value.decode('utf-8'),
'Shader source:',
shader_source,
file=sys.stderr,
sep='\n')
def createShader(self, strings, type):
count = len(strings)
# if we have no source code, ignore this shader
if count < 1:
return
# create the shader handle
shader = GL.glCreateShader(type)
# convert the source strings into a ctypes pointer-to-char array,
# and upload them. This is deep, dark, dangerous black magick -
# don't try stuff like this at home!
""" Next line added """
strings = [s.encode("ascii") for s in strings]
src = (ctypes.c_char_p * count)(*strings)
GL.glShaderSource(
shader, count,
ctypes.cast(ctypes.pointer(src),
ctypes.POINTER(ctypes.POINTER(ctypes.c_char))), None)
# compile the shader
GL.glCompileShader(shader)
temp = ctypes.c_int(0)
# retrieve the compile status
GL.glGetShaderiv(shader, GL.GL_COMPILE_STATUS, ctypes.byref(temp))
# if compilation failed, print the log
if not temp:
# retrieve the log length
GL.glGetShaderiv(shader, GL.GL_INFO_LOG_LENGTH, ctypes.byref(temp))
# create a buffer for the log
buffer = ctypes.create_string_buffer(temp.value)
# retrieve the log text
GL.glGetShaderInfoLog(shader, temp, None, buffer)
# print the log to the console
self.logError(buffer.value)
else:
# all is well, so attach the shader to the program
GL.glAttachShader(self.handle, shader)
def _build_shader(self, strings, stype):
''' Actual building of the shader '''
count = len(strings)
# if we have no source code, ignore this shader
if count < 1:
return
# create the shader handle
shader = gl.glCreateShader(stype)
# convert the source strings into a ctypes pointer-to-char array, and upload them
# this is deep, dark, dangerous black magick - don't try stuff like this at home!
src = (ctypes.c_char_p * count)(*strings)
gl.glShaderSource(shader, count,
ctypes.cast(ctypes.pointer(src),
ctypes.POINTER(ctypes.POINTER(ctypes.c_char))), None)
# compile the shader
gl.glCompileShader(shader)
temp = ctypes.c_int(0)
# retrieve the compile status
gl.glGetShaderiv(shader, gl.GL_COMPILE_STATUS, ctypes.byref(temp))
# if compilation failed, print the log
if not temp:
# retrieve the log length
gl.glGetShaderiv(shader, gl.GL_INFO_LOG_LENGTH, ctypes.byref(temp))
# create a buffer for the log
buffer = ctypes.create_string_buffer(temp.value)
# retrieve the log text
gl.glGetShaderInfoLog(shader, temp, None, buffer)
# print the log to the console
print buffer.value
else:
# all is well, so attach the shader to the program
gl.glAttachShader(self.handle, shader)
def createShader(self, strings, type):
count = len(strings)
# if we have no source code, ignore this shader
if count < 1:
return
# create the shader handle
shader = GL.glCreateShader(type)
# convert the source strings into a ctypes pointer-to-char array,
# and upload them. This is deep, dark, dangerous black magick -
# don't try stuff like this at home!
""" Next line added """
strings = [s.encode("ascii") for s in strings]
src = (ctypes.c_char_p * count)(*strings)
GL.glShaderSource(shader, count,
ctypes.cast(ctypes.pointer(src),
ctypes.POINTER(ctypes.POINTER(ctypes.c_char))), None)
# compile the shader
GL.glCompileShader(shader)
temp = ctypes.c_int(0)
# retrieve the compile status
GL.glGetShaderiv(shader, GL.GL_COMPILE_STATUS, ctypes.byref(temp))
# if compilation failed, print the log
if not temp:
# retrieve the log length
GL.glGetShaderiv(shader, GL.GL_INFO_LOG_LENGTH, ctypes.byref(temp))
# create a buffer for the log
buffer = ctypes.create_string_buffer(temp.value)
# retrieve the log text
GL.glGetShaderInfoLog(shader, temp, None, buffer)
# print the log to the console
self.logError(buffer.value)
else:
# all is well, so attach the shader to the program
GL.glAttachShader(self.handle, shader);
def create_shader(self, strings, t):
count = len(strings)
# if we have no source code, ignore this shader
if count < 1:
return
# create the shader handle
shader = glCreateShader(t)
# convert the source strings into a ctypes pointer-to-char array, and upload them
string_buffers = [
self.process_and_convert_to_string_buffer(s) for s in strings]
# noinspection PyTypeChecker, PyCallingNonCallable
src = (c_char_p * count)(*map(addressof, string_buffers))
glShaderSource(shader, count, cast(
pointer(src), POINTER(POINTER(c_char))), None)
# compile the shader
glCompileShader(shader)
temp = c_int(0)
# retrieve the compile status
glGetShaderiv(shader, GL_COMPILE_STATUS, byref(temp))
# if compilation failed, print the log
if not temp:
# retrieve the log length
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, byref(temp))
# create a buffer for the log
buffer = create_string_buffer(temp.value)
# retrieve the log text
glGetShaderInfoLog(shader, temp, None, buffer)
# print the log to the console
self.log.error(f"{buffer.value}")
else:
# all is well, so attach the shader to the program
glAttachShader(self.handle, shader)
def create(cls, vertex_source, fragment_source, attributes, uniforms):
number_of_string = 1
# Create vertex shader.
vertex_handle = glCreateShader(GL_VERTEX_SHADER)
glShaderSource(vertex_handle, number_of_string,
c_pointer_to_char_pointers(vertex_source), None)
glCompileShader(vertex_handle)
# Create fragment shader.
fragment_handle = glCreateShader(GL_FRAGMENT_SHADER)
glShaderSource(fragment_handle, number_of_string,
c_pointer_to_char_pointers(fragment_source), None)
glCompileShader(fragment_handle)
# Create attributes.
attribute_mapping = []
for attribute in attributes:
attribute_mapping.append(c_string(attribute))
try:
# Create program.
program_handle = glCreateProgram()
glAttachShader(program_handle, vertex_handle)
glAttachShader(program_handle, fragment_handle)
for index, name in enumerate(attribute_mapping):
glBindAttribLocation(program_handle, index, name)
glLinkProgram(program_handle)
glValidateProgram(program_handle)
glUseProgram(program_handle)
except GLException as error:
# Print vertex shader errors.
status = GLint()
glGetShaderiv(vertex_handle, GL_INFO_LOG_LENGTH, byref(status))
output = create_string_buffer(status.value)
glGetShaderInfoLog(vertex_handle, status, None, output)
print(output.value.decode('utf-8'))
# Print fragment shader errors.
status = GLint()
glGetShaderiv(fragment_handle, GL_INFO_LOG_LENGTH, byref(status))
output = create_string_buffer(status.value)
glGetShaderInfoLog(fragment_handle, status, None, output)
print(output.value.decode('utf-8'))
# Print program errors.
status = GLint()
glGetProgramiv(program_handle, GL_INFO_LOG_LENGTH, byref(
status)) # Getting the number of char in info log to 'status'
output = create_string_buffer(status.value) # status.value)
glGetProgramInfoLog(program_handle, status, None, output)
print(output.value.decode('utf-8'))
raise error
# Get uniform location.
uniform_mapping = {}
for uniform in uniforms:
name = c_string(uniform)
location = glGetUniformLocation(
program_handle, cast(pointer(name), POINTER(c_char)))
uniform_mapping[uniform] = location
return cls(program_handle, uniform_mapping)
def __init__(self, shaders, attributes, uniforms):
# Create vertex shader.
vertex_shader = shaders[0]
vertex_handle = glCreateShader(GL_VERTEX_SHADER)
glShaderSource(vertex_handle, 1, c_string_array(vertex_shader), None)
glCompileShader(vertex_handle)
# Create fragment shader.
fragment_shader = shaders[1]
fragment_handle = glCreateShader(GL_FRAGMENT_SHADER)
glShaderSource(fragment_handle, 1, c_string_array(fragment_shader),
None)
glCompileShader(fragment_handle)
try:
# Create program.
program_handle = glCreateProgram()
# Attach shaders
glAttachShader(program_handle, vertex_handle)
glAttachShader(program_handle, fragment_handle)
# Bind attributes.
for index, name in enumerate(attributes):
glBindAttribLocation(program_handle, index, c_string(name))
# Link, validate and use.
glLinkProgram(program_handle)
glValidateProgram(program_handle)
glUseProgram(program_handle)
except GLException:
# Print errors.
status = GLint()
glGetShaderiv(vertex_handle, GL_INFO_LOG_LENGTH, byref(status))
output = create_string_buffer(status.value)
glGetShaderInfoLog(vertex_handle, status, None, output)
print(output.value.decode('utf-8'))
status = GLint()
glGetShaderiv(fragment_handle, GL_INFO_LOG_LENGTH, byref(status))
output = create_string_buffer(status.value)
glGetShaderInfoLog(fragment_handle, status, None, output)
print(output.value.decode('utf-8'))
status = GLint()
glGetProgramiv(program_handle, GL_INFO_LOG_LENGTH, byref(
status)) # Getting the number of char in info log to 'status'
output = create_string_buffer(status.value) # status.value)
glGetProgramInfoLog(program_handle, status, None, output)
print(output.value.decode('utf-8'))
# Query uniform data.
active_uniforms = GLint()
glGetProgramiv(program_handle, GL_ACTIVE_UNIFORMS, active_uniforms)
buffer_size = GLsizei(255)
data_type = GLenum(0)
string_buffer = create_string_buffer(buffer_size.value)
name = c_char_p(addressof(string_buffer))
uniform_mapping = {}
for index in range(active_uniforms.value):
glGetActiveUniform(program_handle, index, buffer_size, None, None,
byref(data_type), name)
if name.value in uniforms:
location = glGetUniformLocation(
program_handle, cast(pointer(name), POINTER(GLchar)))
uniform = Uniform(name.value, location, data_type.value)
uniform_mapping[name.value] = uniform
self.id = GLuint(program_handle)
self.uniforms = uniform_mapping
self.attributes = attributes
def __init__(self, shaders, attributes, uniforms):
vertex_shader = shaders[0]
fragment_shader = shaders[1]
vertex_handle = glCreateShader(GL_VERTEX_SHADER)
glShaderSource(
vertex_handle, 1,
cast(pointer(pointer(create_string_buffer(vertex_shader))),
POINTER(POINTER(GLchar))), None)
glCompileShader(vertex_handle)
fragment_handle = glCreateShader(GL_FRAGMENT_SHADER)
glShaderSource(
fragment_handle, 1,
cast(pointer(pointer(create_string_buffer(fragment_shader))),
POINTER(POINTER(GLchar))), None)
glCompileShader(fragment_handle)
# Create attributes.
attribute_mapping = []
for attribute in attributes:
attribute_mapping.append(create_string_buffer(attribute))
try:
# Create program.
program_handle = glCreateProgram()
glAttachShader(program_handle, vertex_handle)
glAttachShader(program_handle, fragment_handle)
for index, name in enumerate(attributes): # CHANGED
glBindAttribLocation(program_handle, index, name)
glLinkProgram(program_handle)
glValidateProgram(program_handle)
glUseProgram(program_handle)
except GLException:
# Print errors.
status = GLint()
glGetShaderiv(vertex_handle, GL_INFO_LOG_LENGTH, byref(status))
output = create_string_buffer(status.value)
glGetShaderInfoLog(vertex_handle, status, None, output)
print(output.value.decode('utf-8'))
status = GLint()
glGetShaderiv(fragment_handle, GL_INFO_LOG_LENGTH, byref(status))
output = create_string_buffer(status.value)
glGetShaderInfoLog(fragment_handle, status, None, output)
print(output.value.decode('utf-8'))
status = GLint()
glGetProgramiv(program_handle, GL_INFO_LOG_LENGTH, byref(
status)) # Getting the number of char in info log to 'status'
output = create_string_buffer(status.value) # status.value)
glGetProgramInfoLog(program_handle, status, None, output)
print(output.value.decode('utf-8'))
# # Get uniform location.
# uniform_mapping = {}
# for uniform in uniforms:
# name = create_string_buffer(uniform)
# location = glGetUniformLocation(program_handle, cast(pointer(name), POINTER(GLchar)))
# uniform_mapping[uniform] = location
active_shaders = GLint()
glGetProgramiv(program_handle, GL_ACTIVE_UNIFORMS, active_shaders)
buffer_size = GLsizei(255)
data_type = GLenum(0)
string_buffer = create_string_buffer(buffer_size.value)
name = c_char_p(addressof(string_buffer))
uniform_mapping = {}
for index in range(active_shaders.value):
glGetActiveUniform(program_handle, index, buffer_size, None, None,
byref(data_type), name)
if name.value in uniforms:
location = glGetUniformLocation(
program_handle, cast(pointer(name), POINTER(GLchar)))
uniform = Uniform(name.value, location, data_type.value)
uniform_mapping[name.value] = uniform
super().__init__(program_handle)
self.uniforms = uniform_mapping
self.attributes = attribute_mapping
