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