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API to conveniently download data from a vertex buffer

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This commit is contained in:
Kovid Goyal 2017-08-22 12:51:30 +05:30
parent 03e0b9de04
commit 36432c8616
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 14 additions and 2 deletions
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16
kitty/shaders.py
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@ -52,12 +52,14 @@ class BufferManager: # {{{
def __init__(self):
self.sizes = {}
self.types = {}
self.ctypes_types = {}
self.name_count = 0
def create(self, for_use=GL_TEXTURE_BUFFER):
buf_id = glGenBuffers(1)
self.types[buf_id] = for_use
self.sizes.pop(buf_id, None)
self.ctypes_types.pop(buf_id, None)
return buf_id
def delete(self, buf_id):
@ -65,18 +67,24 @@ class BufferManager: # {{{
glDeleteBuffer(buf_id)
self.sizes.pop(buf_id, None)
self.types.pop(buf_id)
self.ctypes_types.pop(buf_id, None)
def set_data(self, buf_id, data, usage=GL_STREAM_DRAW, verify=False):
prev_sz = self.sizes.get(buf_id, 0)
new_sz = sizeof(data)
replace_or_create_buffer(buf_id, new_sz, prev_sz, addressof(data), usage, self.types[buf_id])
self.sizes[buf_id] = new_sz
self.ctypes_types[buf_id] = type(data)
if verify:
verify_data = type(data)()
glGetBufferSubData(buf_id, new_sz, 0, addressof(verify_data))
verify_data = self.get_data(buf_id)
if list(data) != list(verify_data):
raise RuntimeError('OpenGL failed to upload to buffer')
def get_data(self, buf_id):
verify_data = self.ctypes_types[buf_id]()
glGetBufferSubData(buf_id, self.sizes[buf_id], 0, addressof(verify_data))
return verify_data
def bind(self, buf_id):
glBindBuffer(self.types[buf_id], buf_id)
@ -284,6 +292,10 @@ class ShaderProgram: # {{{
bufid = self.vertex_arrays[vao_id]
buffer_manager.set_data(bufid, data, usage=usage)
def get_vertex_data(self, vao_id):
bufid = self.vertex_arrays[vao_id]
return buffer_manager.get_data(bufid)
def __hash__(self) -> int:
return self.program_id