def configShader(self):
"""Set uniforms in current GPU program"""
if self.bayer:
shader = gpu.getProgram()
h = gpu.getUniform(shader, "sourceSize")
glUniform4f(h, self.vid.w, self.vid.h, 1.0/self.vid.w, 1.0/self.vid.h)
h = gpu.getUniform(shader, "firstRed")
# This is the RGGB ordering that works with Elphel
glUniform2f(h, 1, 0)
def draw(self):
# First actual frame has arrived?
if not self.checkLive():
return
# App allows display?
if not self.visible:
return
# App has changed shaders?
if gpu.getProgram() != self.prog:
self.configShader()
self.prog = gpu.getProgram()
# Animated slide to new position?
self.slide()
# Just rect with texture coords
glBindTexture(GL_TEXTURE_2D, self.texID)
glEnable(GL_TEXTURE_2D)
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE)
glEnableClientState(GL_TEXTURE_COORD_ARRAY)
verts = (
self.box.x, self.box.y + self.box.h, # Upper left
self.box.x, self.box.y, # Lower left
self.box.x + self.box.w, self.box.y + self.box.h, # Upper right
self.box.x + self.box.w, self.box.y, # Lower right
)
# GStreamer has image origin at top left
texCoords = (
0, 0,
0, self.tex.h,
self.tex.w, 0,
self.tex.w, self.tex.h,
)
glVertexPointer(2, GL_FLOAT, 0, verts)
glTexCoordPointer(2, GL_FLOAT, 0, texCoords)
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4)
glDisable(GL_TEXTURE_2D)
glDisableClientState(GL_TEXTURE_COORD_ARRAY)
