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Fallback implementation for glCopyImageSubData

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OS X is missing this function so we fallback to a very slow,
GPU->CPU->GPU roundtrip. Fortunately this is needed only rarely so it
should not have a noticeable performance imapct. Le bubbling sigh!
This commit is contained in:
Kovid Goyal
2017-01-11 23:36:43 +05:30
parent 6b01b9613a
commit 063ec7dc02
2 changed files with 57 additions and 8 deletions
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18
kitty/shaders.py
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@@ -2,6 +2,7 @@
# vim:fileencoding=utf-8
# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
import sys
from ctypes import addressof, sizeof
from functools import lru_cache
from threading import Lock
@@ -23,8 +24,9 @@ from .fast_data_types import (
GL_TEXTURE_BUFFER, GL_RGB32UI, GL_FLOAT, GL_ARRAY_BUFFER, glBindBuffer,
glPixelStorei, glTexBuffer, glActiveTexture, glTexStorage3D,
glCopyImageSubData, glTexSubImage3D, ITALIC, BOLD, SpriteMap,
glEnableVertexAttribArray, glVertexAttribPointer
glEnableVertexAttribArray, glVertexAttribPointer, copy_image_sub_data
)
from .utils import safe_print
GL_VERSION = (3, 3)
VERSION = GL_VERSION[0] * 100 + GL_VERSION[1] * 10
@@ -120,8 +122,18 @@ class Sprites:
ynum = self.backend.ynum
if self.backend.z == 0:
ynum -= 1 # Only copy the previous rows
glCopyImageSubData(self.texture_id, tgt, 0, 0, 0, 0, tex, tgt, 0, 0, 0, 0,
width, ynum * self.cell_height, self.last_num_of_layers)
try:
glCopyImageSubData(self.texture_id, tgt, 0, 0, 0, 0, tex, tgt, 0, 0, 0, 0,
width, ynum * self.cell_height, self.last_num_of_layers)
except RuntimeError:
# OpenGL does not have ARB_copy_image
if not hasattr(self, 'realloc_warned'):
safe_print(
'WARNING: Your system\'s OpenGL implementation does not have glCopyImageSubData, falling back to a slower implementation',
file=sys.stderr)
self.realloc_warned = True
copy_image_sub_data(self.texture_id, tex, width, ynum * self.cell_height, self.last_num_of_layers)
glBindTexture(tgt, tex)
glDeleteTexture(self.texture_id)
self.last_num_of_layers = znum
self.last_ynum = self.backend.ynum