Hello,
I'm trying to use a shader to have some "masking effects". So basically I
have one texture which is my image and another texture which has its
alpha-channel set to show the shape I want.
I successfully made the shader. The only problem I have is that I have a
ColorLayer underneath (like in test_shader_example.py) but it does not
show. If I comment out the second texture from the code and the shader (in
the code shown as "Try to comment out this"), I can see the ColorLayer. If
any OpenGL expert can let me know what I'm doing wrong, this would be
highly appreciated. :)
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import cocos
from cocos.director import director
from cocos import shader
import pyglet
from pyglet.gl import *
class TestLayer(cocos.layer.Layer):
def __init__(self):
super(TestLayer, self).__init__()
self.texture = pyglet.image.load("image2.png").get_texture()
self.mask = pyglet.image.load("mask.png").get_texture()
vertex_code = '''
void main()
{
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_Position = ftransform();
}
'''
frag_code = '''
uniform sampler2D texture;
uniform sampler2D mask;
void main()
{
vec4 tex = texture2D(texture, gl_TexCoord[0].xy);
vec4 masktexture = texture2D(mask, gl_TexCoord[0].xy); // Try
to comment out this
tex.a *= masktexture.a; // Try to comment out this
gl_FragColor = tex;
}
'''
self.test_shader = shader.ShaderProgram.simple_program('mask',
vertex_code, frag_code)
def draw(self):
x,y = director.get_window_size()
x = x//2
y = y//2
d = 100
glEnable(GL_TEXTURE_2D)
self.test_shader.install()
self.test_shader.usetTex('texture', 0, GL_TEXTURE_2D,
self.texture.id)
self.test_shader.usetTex('mask', 1, GL_TEXTURE_2D, self.mask.id) #
Try to comment out this
glPushMatrix()
self.transform()
glBegin(GL_TRIANGLES)
# up-right triangle
glColor4ub(255,255,255,255)
glTexCoord2f(1.0, 1.0)
glVertex2f(x+d, y+d)
glColor4ub(255,255,255,255)
glTexCoord2f(0.0, 1.0)
glVertex2f(x-d, y+d)
glColor4ub(255,255,255,255)
glTexCoord2f(1.0, 0.0)
glVertex2f(x+d, y-d)
# down-left triangle
glColor4ub(255,255,255,255)
glTexCoord2f(0.0, 1.0)
glVertex2f(x-d, y+d)
glColor4ub(255,255,255,255)
glTexCoord2f(0.0, 0.0)
glVertex2f(x-d, y-d)
glColor4ub(255,255,255,255)
glTexCoord2f(1.0, 0.0)
glVertex2f(x+d, y-d)
glEnd()
glPopMatrix()
self.test_shader.uninstall()
glDisable(GL_TEXTURE_2D)
def main():
director.init()
test_layer = TestLayer ()
main_scene = cocos.scene.Scene(cocos.layer.ColorLayer(255, 214, 173,
255),
test_layer)
director.run (main_scene)
if __name__ == '__main__':
main()
Daniel.
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