def checkFramebufferStatus():
"""Utility method to check status and raise errors"""
status = glCheckFramebufferStatus( GL_FRAMEBUFFER )
if status == GL_FRAMEBUFFER_COMPLETE:
return True
from OpenGL.error import GLError
description = None
for error_constant in [
GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT,
GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT,
GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS,
GL_FRAMEBUFFER_INCOMPLETE_FORMATS,
GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER,
GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER,
GL_FRAMEBUFFER_UNSUPPORTED,
]:
if status == error_constant:
status = error_constant
description = str(status)
raise GLError(
err=status,
result=status,
baseOperation=glCheckFramebufferStatus,
description=description,
)
def compile(self):
"""Compiles the shader using the current content
value.
Shaders are required to be compiled before a
`py:class:pygly.shader.ShaderProgram` can be linked.
This is not required to be performed in order to
attach a Shader to a ShaderProgram. As long as the
Shader is compiled prior to the ShaderProgram being
linked.
"""
self._handle = GL.glCreateShader(self.type)
GL.glShaderSource(self.handle, self.source)
# compile the shader
try:
GL.glCompileShader(self.handle)
except GLError as e:
self._print_shader_errors(e.description)
raise
# retrieve the compile status
if not GL.glGetShaderiv(self.handle, GL.GL_COMPILE_STATUS):
errors = GL.glGetShaderInfoLog(self.handle)
self._print_shader_errors(errors)
raise GLError(errors)
def link(self):
"""Links the specified shader into a complete program.
It is important to set any attribute locations and
the frag data location BEFORE calling link or these calls
will not take effect.
"""
# link the program
try:
GL.glLinkProgram(self.handle)
except GLError as e:
self._print_shader_errors(e.description)
raise
# retrieve the compile status
if not GL.glGetProgramiv(self.handle, GL.GL_LINK_STATUS):
errors = GL.glGetProgramInfoLog(self.handle)
self._print_shader_errors(errors)
raise GLError(errors)
self.uniforms._on_program_linked()
self.attributes._on_program_linked()