def render(self, text: str) -> None:
glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TEXTURE_BIT)
glEnable(GL_TEXTURE_2D)
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE)
glEnable(GL_BLEND)
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE,
GL_ONE_MINUS_SRC_ALPHA)
pen = numpy.array([0.0, 0.0])
for i in range(len(text)):
char = text[i]
if char not in self._glyphs:
self._glyphs[char] = _Glyph(self._face, char)
self._glyphs[char].render(pen)
pen += self._glyphs[char].advance
if i + 1 < len(text):
kerning = self._face.get_kerning(
self._face.get_char_index(char),
self._face.get_char_index(text[i + 1]))
pen += numpy.array([kerning.x / 64.0, kerning.y / 64.0])
glPopAttrib()
def present_fbo(self, drawable):
self.gl_marker("Presenting FBO on screen for drawable %s" % drawable)
assert drawable
# Change state to target screen instead of our FBO
glBindFramebuffer(GL_FRAMEBUFFER, 0)
if self._has_alpha:
# transparent background:
glClearColor(0.0, 0.0, 0.0, 0.0)
else:
# plain white no alpha:
glClearColor(1.0, 1.0, 1.0, 1.0)
# Draw FBO texture on screen
self.set_rgb_paint_state()
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, self.textures[TEX_FBO])
if self._has_alpha:
# support alpha channel if present:
glEnable(GL_BLEND)
glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD)
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE,
GL_ZERO)
w, h = self.size
glBegin(GL_QUADS)
glTexCoord2i(0, h)
glVertex2i(0, 0)
glTexCoord2i(0, 0)
glVertex2i(0, h)
glTexCoord2i(w, 0)
glVertex2i(w, h)
glTexCoord2i(w, h)
glVertex2i(w, 0)
glEnd()
# Show the backbuffer on screen
if drawable.is_double_buffered():
debug("%s.present_fbo() swapping buffers now", self)
drawable.swap_buffers()
# Clear the new backbuffer to illustrate that its contents are undefined
glClear(GL_COLOR_BUFFER_BIT)
else:
glFlush()
if self._has_alpha:
glDisable(GL_BLEND)
self.gl_frame_terminator()
self.unset_rgb_paint_state()
glBindFramebuffer(GL_FRAMEBUFFER, self.offscreen_fbo)
debug("%s.present_fbo() done", self)
def present_fbo(self, drawable):
self.gl_marker("Presenting FBO on screen for drawable %s" % drawable)
assert drawable
# Change state to target screen instead of our FBO
glBindFramebuffer(GL_FRAMEBUFFER, 0)
if self._has_alpha:
# transparent background:
glClearColor(0.0, 0.0, 0.0, 0.0)
else:
# plain white no alpha:
glClearColor(1.0, 1.0, 1.0, 1.0)
# Draw FBO texture on screen
self.set_rgb_paint_state()
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, self.textures[TEX_FBO])
if self._has_alpha:
# support alpha channel if present:
glEnable(GL_BLEND)
glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD)
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ZERO)
w, h = self.size
glBegin(GL_QUADS)
glTexCoord2i(0, h)
glVertex2i(0, 0)
glTexCoord2i(0, 0)
glVertex2i(0, h)
glTexCoord2i(w, 0)
glVertex2i(w, h)
glTexCoord2i(w, h)
glVertex2i(w, 0)
glEnd()
# Show the backbuffer on screen
if drawable.is_double_buffered():
debug("%s.present_fbo() swapping buffers now", self)
drawable.swap_buffers()
# Clear the new backbuffer to illustrate that its contents are undefined
glClear(GL_COLOR_BUFFER_BIT)
else:
glFlush()
if self._has_alpha:
glDisable(GL_BLEND)
self.gl_frame_terminator()
self.unset_rgb_paint_state()
glBindFramebuffer(GL_FRAMEBUFFER, self.offscreen_fbo)
debug("%s.present_fbo() done", self)