python... pyglet... opengl... scaling

[linksterman]

hey, I was experimenting with pyglet, and was trying out their opengl, but cant figure out how to scale images...

#!/usr/bin/python

# $Id:$



'''Demonstrates one way of fixing the display resolution to a certain

size, but rendering to the full screen.



The method used in this example is:



1. Set the OpenGL viewport to the fixed resolution

2. Render the scene using any OpenGL functions (here, just a polygon)

3. Copy the framebuffer into a texture

4. Reset the OpenGL viewport to the window (full screen) size

5. Blit the texture to the framebuffer



Recent video cards could also render the scene directly to the texture

using EXT_framebuffer_object.  (This is not demonstrated in this example).

'''



from pyglet.gl import *

from pyglet import clock

from pyglet import image

from pyglet import window



# Create a fullscreen window using the user's desktop resolution.  You can

# also use this technique on ordinary resizable windows.

win = window.Window(fullscreen=True)



# Use 320x200 fixed resolution to make the effect completely obvious.  You

# can change this to a more reasonable value such as 800x600 here.

target_resolution = 1280, 800




class FixedResolutionViewport(object):

    def __init__(self, win, width, height, filtered=False):

        self.window = win

        self.width = width

        self.height = height

        self.texture = image.Texture.create_for_size(GL_TEXTURE_2D, 

            width, height, GL_RGB)

        self.texture = self.texture.get_region(0, 0, width, height)



        if not filtered:

            # By default the texture will be bilinear filtered when scaled

            # up.  If requested, turn filtering off.  This makes the image

            # aliased, but is more suitable for pixel art.

            glTexParameteri(self.texture.target, 

                GL_TEXTURE_MAG_FILTER, GL_NEAREST)

            glTexParameteri(self.texture.target, 

                GL_TEXTURE_MIN_FILTER, GL_NEAREST)

    

    def begin(self):

        glViewport(0, 0, self.width, self.height)

        self.set_fixed_projection()



    def end(self):

        buffer = image.get_buffer_manager().get_color_buffer()

        self.texture.blit_into(buffer, 0, 0, 0)



        glViewport(0, 0, self.window.width, self.window.height)

        self.set_window_projection()



        aspect_width = self.window.width / float(self.width)

        aspect_height = self.window.height / float(self.height)

        if aspect_width > aspect_height:

            scale_width = aspect_height * self.width

            scale_height = aspect_height * self.height

        else:

            scale_width = aspect_width * self.width

            scale_height = aspect_width * self.height

        x = (self.window.width - scale_width) / 2

        y = (self.window.height - scale_height) / 2

        

        glClearColor(0, 0, 0, 1)

        glClear(GL_COLOR_BUFFER_BIT)

        glLoadIdentity()

        glColor3f(1, 1, 1)

        self.texture.blit(x, y, width=scale_width, height=scale_height)

    

    def set_fixed_projection(self):

        # Override this method if you need to change the projection of the

        # fixed resolution viewport.

        glMatrixMode(GL_PROJECTION)

        glLoadIdentity()

        glOrtho(0, self.width, 0, self.height, -1, 1)

        glMatrixMode(GL_MODELVIEW)



    def set_window_projection(self):

        # This is the same as the default window projection, reprinted here

        # for clarity.

        glMatrixMode(GL_PROJECTION)

        glLoadIdentity()

        glOrtho(0, self.window.width, 0, self.window.height, -1, 1)

        glMatrixMode(GL_MODELVIEW)



rotate = 0
kitten = image.load('kitten.jpg')

def draw_scene():
    global kitten

    # Draw the scene, assuming the fixed resolution viewport and projection

    # have been set up.

    glClearColor(0, 0, 0, 0)

    glClear(GL_COLOR_BUFFER_BIT)
    f=kitten.width

    glLoadIdentity()
    glEnable(GL_TEXTURE_2D)

    w, h = target_resolution

    glTranslatef(w/2, h/2, 0)

    glRotatef(rotate, 0, 0, 1)

    #glColor3f(1, 1, 0,)

    s = min(w, h) / 4

    glRectf(s, s, s, s)
    kitten.blit(0,0)

viewport = FixedResolutionViewport(win, 

    target_width, target_height, filtered=False)

while not win.has_exit:

    dt = clock.tick()

    rotate += dt * 20



    win.dispatch_events()



    viewport.begin()

    win.clear()

    draw_scene()

    viewport.end()



    win.flip()

that is the fixed_resolutio n.py file that came with it

basically i just want to make that kitten picture rotate instead of the red box. i got the picture to rotate, but I cant figure out how to scale it down to match the box size.

i searched for about 2-3 hours tonight for opengl refrences on how to do this but came up empty handed

[linksterman]

Oops, embarrassing... I put down the wrong code :p

kitten = image.load('kitten.jpg')
texture=kitten.texture

def draw_scene():
    global kitten, texture

    # Draw the scene, assuming the fixed resolution viewport and projection

    # have been set up.

    glClearColor(0, 0, 0, 0)

    glClear(GL_COLOR_BUFFER_BIT)
    f=kitten.width

    glLoadIdentity()
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL)
    glEnable(GL_TEXTURE_2D)

    w, h = target_resolution

    glTranslatef(w/2, h/2, 0)

    #glRotatef(rotate, 0, 0, 1)

    glColor3f(1, 0, 1)

    s = min(w, h) / 4

    glRectf(-s, -s, s, s)
    glBindTexture(GL_TEXTURE_2D, texture.id)
    glBegin(GL_POLYGON)
    glVertex3f (-s, -s, 0.0);
    glVertex3f (s, -s, 0.0);
    glVertex3f (s, s, 0.0);
    glVertex3f (-s, s, 0.0);
    glEnd()

that is what I changed, and all it gives is a gray square