def _render_borders(self):
"""
renders a texture containing the borders
of all shapes.
"""
# XXX
# - read the old glBlendFunc value and restore it if neccessary.
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
self.border_program.use()
for shape_object_id, instances in self._instances.items():
self._shape_vaos[shape_object_id].bind()
for instance in instances:
border_size = instance.border['size']
if len(instance.border) > 0:
glEnable(GL_BLEND)
# XXX
# - cache the modelview matrix
modelview = ModelView()
modelview.set_scaling(instance.size[0]+2*border_size, instance.size[1]+2*border_size)
modelview.set_position(instance.position[0]-border_size, instance.position[1]-border_size)
self.border_program.uniform('mat_modelview', modelview.mat4)
self.border_program.uniform('color', instance.border['color'])
glDrawArrays(GL_TRIANGLES, 0, 6)
glDisable(GL_BLEND)
# XXX
# - cache the modelview matrix
modelview = ModelView()
modelview.set_scaling(*instance.size)
modelview.set_position(*instance.position)
self.border_program.uniform('color', [0,0,0,0])
self.border_program.uniform('mat_modelview', modelview.mat4)
glDrawArrays(GL_TRIANGLES, 0, 6)
self._shape_vaos[shape_object_id].unbind()
self.border_program.unuse()
glEnable(GL_BLEND)
def render(self):
# Render border texture
# XXX
# - only do if neccessary.
self._borderframe.use()
self._render_borders()
self._borderframe.unuse()
self.program.use()
glActiveTexture(GL_TEXTURE0);
for shape_object_id, instances in self._instances.items():
self._shape_vaos[shape_object_id].bind()
for instance in instances:
# XXX
# - define the exact behavior of mix_texture.
if instance.texture is not None:
self.program.uniform('mix_texture', 1)
self.program.uniform('tex', 0)
glBindTexture(GL_TEXTURE_2D, instance.texture.gl_texture_id)
else:
self.program.uniform('mix_texture', 0)
glBindTexture(GL_TEXTURE_2D, 0)
# XXX
# - cache the modelview matrix
modelview = ModelView()
modelview.set_scaling(*instance.size)
modelview.set_position(*instance.position)
self.program.uniform('color', instance.color)
self.program.uniform('mat_modelview', modelview.mat4)
glDrawArrays(GL_TRIANGLES, 0, 6)
self._shape_vaos[shape_object_id].unbind()
self.program.unuse()
# render borders
# XXX
# - only if neccessary
self._borderframe.render()