def __init__( self, shader, dimensions, texture1 = None, texture2 = None ):
super( ShaderGeneratedTexture, self ).__init__()
self.dimensions = dimensions
self.shader = shader
self.fbo1 = FBO_Texture( dimensions, texture1 )
self.fbo2 = FBO_Texture( dimensions, texture2 )
class ShaderGeneratedTexture( object ):
def __init__( self, shader, dimensions, texture1 = None, texture2 = None ):
super( ShaderGeneratedTexture, self ).__init__()
self.dimensions = dimensions
self.shader = shader
self.fbo1 = FBO_Texture( dimensions, texture1 )
self.fbo2 = FBO_Texture( dimensions, texture2 )
#self.fbo1, self.fbo2 = self.fbo2, self.fbo1
def bind( self ):
# switch FBOs around
self.fbo1, self.fbo2 = self.fbo2, self.fbo1
# render fbo1 to fbo2
self.fbo1.bind()
# set the viewport to be the size of the texture
glPushAttrib( GL_VIEWPORT_BIT | GL_SCISSOR_BIT )
glViewport( 0, 0, self.dimensions[ 0 ], self.dimensions[ 1 ] )
# disable glScissor or we will get flashing
glDisable( GL_SCISSOR_TEST )
# clear our buffer
glClear( GL_COLOR_BUFFER_BIT )
# set our viewport to an orthogonal viewmatrix
glMatrixMode( GL_PROJECTION )
glPushMatrix()
glLoadIdentity()
# set our modelview to identity
glMatrixMode( GL_MODELVIEW )
glPushMatrix()
glLoadIdentity()
# bind our shader
self.shader.bind()
# bind fbo2's texture to our shader
# this is the input for fbo1's shader
glActiveTexture( GL_TEXTURE0 )
glBindTexture( self.fbo2.texture.target, self.fbo2.texture.id )
# disable texture filtering
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST )
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST )
def render( self ):
# render a quad at 0,0,0
left, bottom, right, top = -1.0, -1.0, 1.0, 1.0
glBegin( GL_QUADS )
glTexCoord2f( 0.0, 0.0 )
glVertex2f( left, bottom )
glTexCoord2f( 1.0, 0.0 )
glVertex2f( right, bottom )
glTexCoord2f( 1.0, 1.0 )
glVertex2f( right, top )
glTexCoord2f( 0.0, 1.0 )
glVertex2f( left, top )
glEnd()
def unbind( self ):
glBindTexture( self.fbo2.texture.target, 0 )
self.shader.unbind()
# reset state
glPopMatrix()
glMatrixMode( GL_PROJECTION )
glPopMatrix()
glMatrixMode( GL_MODELVIEW )
glPopAttrib()
self.fbo1.unbind()
@property
def texture( self ):
return self.fbo1.texture
@property
def width( self ):
return self.dimensions[ 0 ]
@property
def height( self ):
return sef.dimensions[ 1 ]
