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Only clear screen a limited number of times

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glClear() is surprisingly slow
This commit is contained in:
Kovid Goyal 2016-11-10 23:43:01 +05:30
parent ccce454183
commit 1b252be434
1 changed files with 6 additions and 1 deletions
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7
kitty/char_grid.py
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@ -164,6 +164,7 @@ class CharGrid:
viewport=Size(self.width, self.height), clear_color=self.original_bg, viewport=Size(self.width, self.height), clear_color=self.original_bg,
cursor=self.default_cursor)) cursor=self.default_cursor))
self.sprites.ensure_state() self.sprites.ensure_state()
self.clear_count = 4
def destroy(self): def destroy(self):
self.sprites.destroy() self.sprites.destroy()
@ -194,6 +195,7 @@ class CharGrid:
self.screen.resize(sg.ynum, sg.xnum) self.screen.resize(sg.ynum, sg.xnum)
self.sprite_map = (c_uint * (sg.ynum * sg.xnum * 9))() self.sprite_map = (c_uint * (sg.ynum * sg.xnum * 9))()
self.update_cell_data(add_viewport_data=True) self.update_cell_data(add_viewport_data=True)
self.clear_count = 4
def change_colors(self, changes): def change_colors(self, changes):
dirtied = False dirtied = False
@ -209,6 +211,7 @@ class CharGrid:
dirtied = True dirtied = True
if dirtied: if dirtied:
self.render_queue.put(RenderData(clear_color=self.default_bg)) self.render_queue.put(RenderData(clear_color=self.default_bg))
self.clear_count = 4
def update_cell_data(self, changes=None, add_viewport_data=False): def update_cell_data(self, changes=None, add_viewport_data=False):
rd = RenderData(sprite_layout=self.sprites.layout) rd = RenderData(sprite_layout=self.sprites.layout)
@ -254,7 +257,9 @@ class CharGrid:
def render(self): def render(self):
' This is the only method in this class called in the UI thread (apart from __init__) ' ' This is the only method in this class called in the UI thread (apart from __init__) '
glClear(GL_COLOR_BUFFER_BIT) if self.clear_count > 0:
glClear(GL_COLOR_BUFFER_BIT)
self.clear_count -= 1
cell_data_changed = self.get_all_render_changes() cell_data_changed = self.get_all_render_changes()
with self.sprites: with self.sprites:
with self.lock: with self.lock: