118 lines
2.1 KiB
Plaintext
118 lines
2.1 KiB
Plaintext
// Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
|
||
// 灰化特效
|
||
// 原理：
|
||
// r = 0.2126 * r + 0.7152 * g + 0.0722 * b
|
||
// g = 0.2126 * r + 0.7152 * g + 0.0722 * b
|
||
// b = 0.2126 * r + 0.7152 * g + 0.0722 * b
|
||
|
||
CCEffect %{
|
||
techniques:
|
||
- passes:
|
||
- vert: vs
|
||
frag: fs
|
||
blendState:
|
||
targets:
|
||
- blend: true
|
||
rasterizerState:
|
||
cullMode: none
|
||
properties:
|
||
texture: { value: white }
|
||
alphaThreshold: { value: 0.5 }
|
||
# 灰化程度
|
||
grayLevel: {
|
||
value: 1.0,
|
||
editor: {
|
||
tooltip: "灰化程度",
|
||
range: [0.0, 1.0]
|
||
}
|
||
}
|
||
}%
|
||
|
||
|
||
CCProgram vs %{
|
||
precision highp float;
|
||
|
||
#include <cc-global>
|
||
#include <cc-local>
|
||
|
||
in vec3 a_position;
|
||
in vec4 a_color;
|
||
out vec4 v_color;
|
||
|
||
#if USE_TEXTURE
|
||
in vec2 a_uv0;
|
||
out vec2 v_uv0;
|
||
#endif
|
||
|
||
void main () {
|
||
vec4 pos = vec4(a_position, 1);
|
||
|
||
#if CC_USE_MODEL
|
||
pos = cc_matViewProj * cc_matWorld * pos;
|
||
#else
|
||
pos = cc_matViewProj * pos;
|
||
#endif
|
||
|
||
#if USE_TEXTURE
|
||
v_uv0 = a_uv0;
|
||
#endif
|
||
|
||
v_color = a_color;
|
||
|
||
gl_Position = pos;
|
||
}
|
||
}%
|
||
|
||
|
||
CCProgram fs %{
|
||
precision highp float;
|
||
|
||
#include <alpha-test>
|
||
|
||
in vec4 v_color;
|
||
|
||
#if USE_TEXTURE
|
||
in vec2 v_uv0;
|
||
uniform sampler2D texture;
|
||
#endif
|
||
|
||
#if USE_GRAY
|
||
uniform GrayPhoto {
|
||
// 灰化程度
|
||
float grayLevel;
|
||
};
|
||
#endif
|
||
|
||
void main () {
|
||
vec4 o = vec4(1, 1, 1, 1);
|
||
|
||
#if USE_TEXTURE
|
||
o *= texture(texture, v_uv0);
|
||
#if CC_USE_ALPHA_ATLAS_TEXTURE
|
||
o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;
|
||
#endif
|
||
#endif
|
||
|
||
o *= v_color;
|
||
|
||
ALPHA_TEST(o);
|
||
|
||
#if USE_GRAY
|
||
vec4 srcColor = o;
|
||
|
||
float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;
|
||
vec4 grayColor = vec4(gray, gray, gray, o.a);
|
||
|
||
|
||
// o = srcColor + (grayColor - srcColor) * grayLevel;
|
||
// 实际上，在OpenGL中内置了mix混合函数，实际效果就是上面这条公式
|
||
// mix(x, y, a)函数理解：x * (1.0 - a) + y * a
|
||
// 为了看起来更像OpenGL，因此这里改为采用内置函数
|
||
|
||
o = mix(srcColor, grayColor, grayLevel);
|
||
|
||
#endif
|
||
gl_FragColor = o;
|
||
}
|
||
}%
|