def bind(self, location: int, shader: Shader):
stride = self.stride * sizeof(GLfloat)
offset = self.offset * sizeof(GLfloat)
glEnableVertexAttribArray(location)
glVertexAttribPointer(location, self.vertex_size, GL_FLOAT, GL_FALSE,
stride, offset)
glBindAttribLocation(shader.handle, location,
bytes(self.name, "utf-8"))
def bind_data(entity):
glBindVertexArray(entity.asset.vertex_array_id)
glBindBuffer(GL_ARRAY_BUFFER, entity.asset.vertex_buffer_id)
for position, name, gl_type, size, stride, offset in entity.asset.attributes:
glVertexAttribPointer(position, size, gl_type,
GL_FALSE, stride, offset)
glEnableVertexAttribArray(position)
glBindAttribLocation(entity.asset.shader.handle,
position, bytes(name, "utf-8"))
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,
entity.asset.index_buffers[entity.asset.current_index_buffer_id].id)
def __init__(self,
vertex_shader: Shader,
fragment_shader: Shader,
attributes=(),
uniforms=None):
"""
The process of creating a shader can be divided into 6 steps:
1. Create an ID.
2. Attach shaders.
3. Bind attributes.
4. Link program.
5. Validate program.
6. Bind uniforms.
Args:
vertex_shader:
fragment_shader:
attributes:
uniforms: A dictionary with the names of the uniform as the key, and the uniform (glsl value) as value.
"""
if uniforms is None:
uniforms = {}
handle = -1
attribute_location = {}
uniform_location = {}
try:
handle = glCreateProgram()
glAttachShader(handle, vertex_shader)
glAttachShader(handle, fragment_shader)
for index, name in enumerate(attributes):
glBindAttribLocation(handle, index, c_string(name))
attribute_location[name] = index
glLinkProgram(handle)
glValidateProgram(handle)
for uniform in uniforms:
uniform_location[uniform] = glGetUniformLocation(
handle, c_string(uniform))
except GLException:
debug_program(handle)
super(Program, self).__init__(handle)
self.vertex_shader = vertex_shader
self.fragment_shader = fragment_shader
self.attribute_location = attribute_location
self.uniform_location = uniform_location
self.uniforms = uniforms
if CHECK_ERROR:
debug_program(self)
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
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 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)
