Python，Pyglet 在模板蒙版内绘制形状像素

Posted 2023-02-22

【中文标题】Python，Pyglet 在模板蒙版内绘制形状像素

【英文标题】：Python, Pyglet draw shape pixels inside stencil mask

【发布时间】：2017-07-31 19:58:13

【问题描述】：

我正面临着这个问题，我试图通过在互联网上找到的多种方式来解决这个问题，但我尝试的所有方法都没有任何视觉差异。我想绘制一个丢弃圆形遮罩之外的所有像素的形状，在下面的示例代码中，我使用矩形遮罩而不是圆形，只是为了展示我正在尝试做的事情。而我唯一能做的就是在蓝色形状上打一个洞。我想剪掉面具外面的所有东西，就像剪刀一样，但我想用圆形面具，并且光滑。你们能帮帮我吗？缺少哪些代码行？

import pyglet
from pyglet.gl import gl
from pyglet.gl import*
from pyglet.window import Window

Config = pyglet.gl.Config(sample_buffers=1, samples=16, double_buffer=True)
window = Window(800, 640, caption='Stencil Test Draw with mask', config=Config)
print([i for i in dir(gl) if 'invert'.lower() in i.lower()])

@window.event
def on_draw():
    window.clear()
    """ alpha blending """
    gl.glEnable(gl.GL_BLEND)
    gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)

    """ Trying to smooth stencil Circle Mask """
    glEnable(GL_SMOOTH)

    """ Draw a background """
    glColor4f(1, 1, 0, 1.0)
    pyglet.graphics.draw(4, GL_QUADS, ('v2f', [0,0, 0,500, 500,500, 500,0]))

    glEnable(GL_STENCIL_TEST)
    glEnable(GL_DEPTH_TEST)
    glColorMask(False, False, False, False)

    """ Draw Stencil Mask (I'm trying with a circle shape, but in this example I use rect) """
    pyglet.graphics.draw(4, GL_QUADS, ('v2f', [250,250, 250,300, 300,300, 300,250]))

    glColorMask(True, True, True, True)

    """ Draw rectangle pixels only inside stencil mask """
    glColor4f(0, 0, 1, 1.0)
    pyglet.graphics.draw(4, GL_QUADS, ('v2f', [200,200, 200,350, 350,350, 350,200]))

    """ Remove stencil test """
    glDisable(GL_STENCIL_TEST)

pyglet.app.run()

【参考方案1】：

我解决了这个问题：

import pyglet
from pyglet.gl import gl
from pyglet.gl import*
from pyglet.window import Window

Config = pyglet.gl.Config(sample_buffers=1, samples=16, double_buffer=True, stencil_size=8)
window = Window(800, 640, caption='Stencil Test Draw with mask', config=Config)

@window.event
def on_draw():
    window.clear()
    """ alpha blending """
    gl.glEnable(gl.GL_BLEND)
    gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)

    """ Trying to smooth stencil Circle Mask """
    glEnable(GL_SMOOTH)

    """Clear """
    glClearStencil(0)
    glEnable(GL_STENCIL_TEST)
    glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE)
    glStencilFunc(GL_NEVER, 0, 1)
    glStencilOp(GL_INVERT, GL_INVERT, GL_INVERT)

    """ Draw Stencil Mask (I'm trying with a circle shape, but in this example I use rect) """
    glColor4f(1, 0, 0, 1.0)
    pyglet.graphics.draw(4, GL_QUADS, ('v2f', [250,250, 250,300, 300,300, 300,250]))

    """ Now, we want only the framebuffer to be updated if stencil value is 1 """
    """ Draw rectangle pixels only inside stencil mask """
    glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE)
    glStencilFunc(GL_EQUAL, 1, 1)
    glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO)
    glColor4f(0.0, 1.0, 1.0, 1.0)
    pyglet.graphics.draw(4, GL_QUADS, ('v2f', [200,200, 200,350, 350,350, 350,200]))

    """ Remove stencil test """
    glDisable(GL_STENCIL_TEST)

pyglet.app.run()