#cython: profile=False
# Copyright 2004-2011 Tom Rothamel <pytom@bishoujo.us>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from gl cimport *
from renpy.display.glenviron import *

class CopyRtt(Rtt):
    """
    This class uses texture copying to implement Render-to-texture.
    """

    def init(self):
        return
        
    def deinit(self):
        return

    def render(self, texture, x, y, w, h, draw_func):
        """
        This function is called to trigger a rendering to a texture.
        `x`, `y`, `w`, and `h` specify the location and dimensions of
        the sub-image to render to the texture. `draw_func` is called
        to render the texture.
        """

        glViewport(0, 0, w, h)

        glMatrixMode(GL_PROJECTION)
        glLoadIdentity()
        glOrtho(x, x + w, y, y + h, -1, 1)
        glMatrixMode(GL_MODELVIEW)

        draw_func(x, y, w, h)

        glBindTexture(GL_TEXTURE_2D, texture)

        glCopyTexSubImage2D(
            GL_TEXTURE_2D,
            0,
            0,
            0,
            0,
            0,
            w,
            h)        

    def end(self):
        """
        This is called when a Render-to-texture session ends.
        """

    def get_size_limit(self, dimension):
        return dimension
    
