def __init__(self):
self.models = []
self.lights = []
# render to texture scenes
self.sceneFBOS = []
# all units <self.textureCounter are reserved
self.textureCounter = 0
self.textureMatrixCounter = 0
# matrix used for projective textures will be stored at this unit
# only used when self.useProjectiveTextures=True
self.useProjectiveTextures = False
self.projectiveTextureIndex = -1
self.projectiveTextureMatrixIndex = -1
self.projectivTextureMatrix = ProjectiveTextureMatrix(self)
# set to true if you need the frustum points/centroid calculated
self.needFrustumPoints = False
# and the associated frustum
self.sceneFrustum = Frustum(0.0, 1.0)
GLApp.__init__(self)
# camera for user movement
self.sceneCamera = UserCamera(self)
# create screen textures
self.sceneTexture = Texture2D(width=self.winSize[0], height=self.winSize[1])
self.sceneTexture.create()
self.sceneDepthTexture = DepthTexture2D(width=self.winSize[0], height=self.winSize[1])
self.sceneDepthTexture.create()
# a shader that only handles the depth
self.depthShader = DepthShader()
self.visualizeDepthShader = VisualizeDepthShader()
### TESTING ###
self.lightAngle = 0.0
class ModelApp(GLApp):
"""
ModelApp splits rendering in multiple passes using fbos.
"""
def __init__(self):
self.models = []
self.lights = []
# render to texture scenes
self.sceneFBOS = []
# all units <self.textureCounter are reserved
self.textureCounter = 0
self.textureMatrixCounter = 0
# matrix used for projective textures will be stored at this unit
# only used when self.useProjectiveTextures=True
self.useProjectiveTextures = False
self.projectiveTextureIndex = -1
self.projectiveTextureMatrixIndex = -1
self.projectivTextureMatrix = ProjectiveTextureMatrix(self)
# set to true if you need the frustum points/centroid calculated
self.needFrustumPoints = False
# and the associated frustum
self.sceneFrustum = Frustum(0.0, 1.0)
GLApp.__init__(self)
# camera for user movement
self.sceneCamera = UserCamera(self)
# create screen textures
self.sceneTexture = Texture2D(width=self.winSize[0], height=self.winSize[1])
self.sceneTexture.create()
self.sceneDepthTexture = DepthTexture2D(width=self.winSize[0], height=self.winSize[1])
self.sceneDepthTexture.create()
# a shader that only handles the depth
self.depthShader = DepthShader()
self.visualizeDepthShader = VisualizeDepthShader()
### TESTING ###
self.lightAngle = 0.0
def reserveTextureUnit(self):
""" increase texture counter. """
self.textureCounter += 1
return self.textureCounter - 1
def reserveTextureMatrixUnit(self):
""" increase texture counter. """
self.textureMatrixCounter += 1
return self.textureMatrixCounter - 1
def enableProjectiveTextures(self):
"""
sets flag for enabling projective textures
and reserves one texture unit for the projection matrix.
"""
if self.projectiveTextureIndex != -1:
return
self.projectiveTextureIndex = self.reserveTextureUnit()
self.projectiveTextureMatrixIndex = self.reserveTextureMatrixUnit()
self.useProjectiveTextures = True
def _loadProjectiveTextureMatrix():
self.projectivTextureMatrix.load(self.projectiveTextureMatrixIndex)
self.signalConnect(GLApp.APP_PROJECTION_CHANGED, _loadProjectiveTextureMatrix)
self.sceneCamera.signalConnect(Camera.CAMERA_MODELVIEW_SIGNAL, _loadProjectiveTextureMatrix)
def addModel(self, model):
"""
adds a model to this application.
"""
self.models.append(model)
self.lights += model.lights
self.lights = unique(self.lights)
for s in model.segments:
if s.usesProjectiveTexture():
self.enableProjectiveTextures()
break
def prependFBO(self, sceneFBO, drawScene, sceneCamera):
"""
prepends a render to texture operation before scene rendering is done.
"""
self.sceneFBOS = [(sceneFBO, drawScene, sceneCamera)] + self.sceneFBOS
def appendFBO(self, sceneFBO, drawScene, sceneCamera):
"""
appends a render to texture operation before scene rendering is done.
"""
self.sceneFBOS.append((sceneFBO, drawScene, sceneCamera))
def setDefaultSceneFBO(self):
""" set the default fbo for offscreen scene rendering. """
drawSceneFBO = FBO()
drawSceneFBO.addColorTexture(self.sceneTexture)
drawSceneFBO.setDepthTexture(self.sceneDepthTexture)
drawSceneFBO.create()
self.appendFBO(drawSceneFBO, self.drawSceneComplete, self.sceneCamera)
def drawSceneComplete(self):
""" draws scene with color. """
map(lambda m: m.draw(self, m), self.models)
def drawSceneGeometry(self):
"""
draws the scene geometry only.
usefull for depth value rendering.
"""
map(_drawModelGeometry, self.models)
def setWindowSize(self, size):
"""
also set frustum projection.
"""
ret = GLApp.setWindowSize(self, size)
# set the frustum projection
self.sceneFrustum.setProjection(self.fov, self.aspect, self.nearClip, self.farClip)
return ret
def orthogonalPass(self, debugShadows=False):
"""
draw stuff in orthogonal projection.
mainly the scene can be post processed here
and some gui elements could be drawn.
"""
### DRAW THE SCENE ###
# TODO: post shader magic !
glUseProgram(0)
# enable the scene texture
# Note that texture unit 0 should be active now.
glEnable(GL_TEXTURE_2D)
glBindTexture(GL_TEXTURE_2D, self.sceneTexture.glID)
# make sure texture matrix is set to identity
glMatrixMode(GL_TEXTURE)
glLoadIdentity()
glMatrixMode(GL_MODELVIEW)
glBegin(GL_QUADS)
glTexCoord2f(0.0, 0.0)
glVertex3f(0.0, 0.0, -1.0)
glTexCoord2f(1.0, 0.0)
glVertex3f(self.winSize[0], 0.0, -1.0)
glTexCoord2f(1.0, 1.0)
glVertex3f(self.winSize[0], self.winSize[1], -1.0)
glTexCoord2f(0.0, 1.0)
glVertex3f(0.0, self.winSize[1], -1.0)
glEnd()
### DEBUG DRAWINGS ###
# debug shadow maps
if debugShadows:
# draw the shadow maps
self.visualizeDepthShader.enable()
layerLoc = glGetUniformLocation(self.visualizeDepthShader.program, "layer")
drawShadowMaps(self.lights, layerLoc)
# reset viewport and reset to ffp
glViewport(0, 0, self.winSize[0], self.winSize[1])
glUseProgram(0)
glBindTexture(GL_TEXTURE_2D, 0)
glDisable(GL_TEXTURE_2D)
GLApp.orthogonalPass(self)
def processEvent(self, event):
""" processes one event. """
# pass some events to the scene camera
if event.type == MOUSEMOTION:
self.sceneCamera.motion(*event.pos)
elif event.type == MOUSEBUTTONUP or event.type == MOUSEBUTTONDOWN:
self.sceneCamera.mouseEvent(event.button, event.type, event.pos[0], event.pos[1])
def animationStep(self):
####### TESTING ##########
self.lightAngle += 0.005
if self.lightAngle >= 2.0 * pi:
self.lightAngle -= 2.0 * pi
lightRadius = 4.0
self.lights[0].lightPosition = array(
[lightRadius * sin(self.lightAngle), lightRadius, lightRadius * cos(self.lightAngle), 0.0], float32
)
self.lights[0].signalQueueEmit(Light.LIGHT_POSITION_SIGNAL)
####### TESTING ##########
def processFrame(self, timePassedSecs):
""" draws a scene """
# update the model view matrix
self.sceneCamera.updateKeys()
self.sceneCamera.update()
# process queued GLObject events
GLObject.signalsEmit()
# enable some default scene states
glEnable(GL_DEPTH_TEST)
######## SHADOW MAP RENDERING START ########
# offset the geometry slightly to prevent z-fighting
# note that this introduces some light-leakage artifacts
glEnable(GL_POLYGON_OFFSET_FILL)
glPolygonOffset(1.1, 4096.0)
# cull front faces for shadow rendering,
# this moves z-fighting to backfaces.
glCullFace(GL_FRONT)
# enable depth rendering shader.
# FIXME: support segment geometry shader!
# geometry shader could change the shadow shape!
self.depthShader.enable()
map(_updateLightShadowMap, self.lights)
glBindFramebuffer(GL_FRAMEBUFFER, 0)
glDisable(GL_POLYGON_OFFSET_FILL)
######## SHADOW MAP RENDERING STOP ########
#### TODO: FOG: integrate FOG ####
glEnable(GL_FOG)
glFogi(GL_FOG_MODE, GL_EXP2)
# approximate the atmosphere's filtering effect as a linear function
sunDir = array([4.0, 4.0, 4.0, 0.0], float32) # TODO: FOG: what is the sun dir ?
skyColor = array([0.8, sunDir[1] * 0.1 + 0.7, sunDir[1] * 0.4 + 0.5, 1.0], float32)
glClearColor(*skyColor)
glFogf(GL_FOG_DENSITY, 0.4)
glFogf(GL_FOG_START, 16.0)
glFogf(GL_FOG_END, self.farClip)
glFogfv(GL_FOG_COLOR, skyColor)
# fill projection matrix
glMatrixMode(GL_PROJECTION)
glLoadMatrixf(self.projectionMatrix)
glMatrixMode(GL_MODELVIEW)
# draw stuff in 3d projection
lastCam = None
glPushAttrib(GL_COLOR_BUFFER_BIT)
for (fbo, draw, cam) in self.sceneFBOS:
# render to fbo
fbo.enable()
if cam != lastCam:
cam.enable()
lastCam = cam
draw()
# disable render to texture
FBO.disable()
glPopAttrib()
glViewport(0, 0, self.winSize[0], self.winSize[1])
#### TODO: FOG: integrate FOG ####
glDisable(GL_FOG)
# change to orthogonal projection
glMatrixMode(GL_PROJECTION)
glLoadMatrixf(self.orthoMatrix)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
# no depth test needed in orthogonal rendering
glDisable(GL_DEPTH_TEST)
# draw orthogonal to the screen
self.orthogonalPass()
