Test_Project_Cocos/CocosCreator-Shader-Effect-Demo
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置灰的渐变函数采用mix函数

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caizhitao 2020-03-12 15:41:31 +08:00
parent ef47955a94
commit 79a8e3d4bf
2 changed files with 10 additions and 3 deletions
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9
assets/effects/sprite-gray.effect
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@ -103,7 +103,14 @@ CCProgram fs %{
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;
// 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;
}

4
assets/effects/sprite-gray.effect.meta
View File

@ -5,11 +5,11 @@
{
"glsl1": {
"vert": "\nprecision highp float;\nuniform mediump mat4 cc_matViewProj;\nuniform mat4 cc_matWorld;\nattribute vec3 a_position;\nattribute vec4 a_color;\nvarying vec4 v_color;\n#if USE_TEXTURE\nattribute vec2 a_uv0;\nvarying vec2 v_uv0;\n#endif\nvoid main () {\n vec4 pos = vec4(a_position, 1);\n #if CC_USE_MODEL\n pos = cc_matViewProj * cc_matWorld * pos;\n #else\n pos = cc_matViewProj * pos;\n #endif\n #if USE_TEXTURE\n v_uv0 = a_uv0;\n #endif\n v_color = a_color;\n gl_Position = pos;\n}",
"frag": "\nprecision highp float;\n#if USE_ALPHA_TEST\n uniform float alphaThreshold;\n#endif\nvoid ALPHA_TEST (in vec4 color) {\n #if USE_ALPHA_TEST\n if (color.a < alphaThreshold) discard;\n #endif\n}\nvoid ALPHA_TEST (in float alpha) {\n #if USE_ALPHA_TEST\n if (alpha < alphaThreshold) discard;\n #endif\n}\nvarying vec4 v_color;\n#if USE_TEXTURE\nvarying vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n#if USE_GRAY\nuniform float grayLevel;\n#endif\nvoid main () {\n vec4 o = vec4(1, 1, 1, 1);\n #if USE_TEXTURE\n o *= texture2D(texture, v_uv0);\n #if CC_USE_ALPHA_ATLAS_TEXTURE\n o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n #endif\n #endif\n o *= v_color;\n ALPHA_TEST(o);\n #if USE_GRAY\n vec4 srcColor = o;\n float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;\n vec4 grayColor = vec4(gray, gray, gray, o.a);\n o = srcColor + (grayColor - srcColor) * grayLevel;\n #endif\n gl_FragColor = o;\n}"
"frag": "\nprecision highp float;\n#if USE_ALPHA_TEST\n uniform float alphaThreshold;\n#endif\nvoid ALPHA_TEST (in vec4 color) {\n #if USE_ALPHA_TEST\n if (color.a < alphaThreshold) discard;\n #endif\n}\nvoid ALPHA_TEST (in float alpha) {\n #if USE_ALPHA_TEST\n if (alpha < alphaThreshold) discard;\n #endif\n}\nvarying vec4 v_color;\n#if USE_TEXTURE\nvarying vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n#if USE_GRAY\nuniform float grayLevel;\n#endif\nvoid main () {\n vec4 o = vec4(1, 1, 1, 1);\n #if USE_TEXTURE\n o *= texture2D(texture, v_uv0);\n #if CC_USE_ALPHA_ATLAS_TEXTURE\n o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n #endif\n #endif\n o *= v_color;\n ALPHA_TEST(o);\n #if USE_GRAY\n vec4 srcColor = o;\n float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;\n vec4 grayColor = vec4(gray, gray, gray, o.a);\n o = mix(srcColor, grayColor, grayLevel);\n #endif\n gl_FragColor = o;\n}"
},
"glsl3": {
"vert": "\nprecision highp float;\nuniform CCGlobal {\n highp vec4 cc_time;\n mediump vec4 cc_screenSize;\n mediump vec4 cc_screenScale;\n mediump vec4 cc_nativeSize;\n highp mat4 cc_matView;\n mediump mat4 cc_matViewInv;\n mediump mat4 cc_matProj;\n mediump mat4 cc_matProjInv;\n mediump mat4 cc_matViewProj;\n mediump mat4 cc_matViewProjInv;\n mediump vec4 cc_cameraPos;\n};\nuniform CCLocal {\n mat4 cc_matWorld;\n mat4 cc_matWorldIT;\n};\nin vec3 a_position;\nin vec4 a_color;\nout vec4 v_color;\n#if USE_TEXTURE\nin vec2 a_uv0;\nout vec2 v_uv0;\n#endif\nvoid main () {\n vec4 pos = vec4(a_position, 1);\n #if CC_USE_MODEL\n pos = cc_matViewProj * cc_matWorld * pos;\n #else\n pos = cc_matViewProj * pos;\n #endif\n #if USE_TEXTURE\n v_uv0 = a_uv0;\n #endif\n v_color = a_color;\n gl_Position = pos;\n}",
"frag": "\nprecision highp float;\n#if USE_ALPHA_TEST\n uniform ALPHA_TEST {\n float alphaThreshold;\n };\n#endif\nvoid ALPHA_TEST (in vec4 color) {\n #if USE_ALPHA_TEST\n if (color.a < alphaThreshold) discard;\n #endif\n}\nvoid ALPHA_TEST (in float alpha) {\n #if USE_ALPHA_TEST\n if (alpha < alphaThreshold) discard;\n #endif\n}\nin vec4 v_color;\n#if USE_TEXTURE\nin vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n#if USE_GRAY\nuniform GrayPhoto {\n float grayLevel;\n};\n#endif\nvoid main () {\n vec4 o = vec4(1, 1, 1, 1);\n #if USE_TEXTURE\n o *= texture(texture, v_uv0);\n #if CC_USE_ALPHA_ATLAS_TEXTURE\n o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n #endif\n #endif\n o *= v_color;\n ALPHA_TEST(o);\n #if USE_GRAY\n vec4 srcColor = o;\n float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;\n vec4 grayColor = vec4(gray, gray, gray, o.a);\n o = srcColor + (grayColor - srcColor) * grayLevel;\n #endif\n gl_FragColor = o;\n}"
"frag": "\nprecision highp float;\n#if USE_ALPHA_TEST\n uniform ALPHA_TEST {\n float alphaThreshold;\n };\n#endif\nvoid ALPHA_TEST (in vec4 color) {\n #if USE_ALPHA_TEST\n if (color.a < alphaThreshold) discard;\n #endif\n}\nvoid ALPHA_TEST (in float alpha) {\n #if USE_ALPHA_TEST\n if (alpha < alphaThreshold) discard;\n #endif\n}\nin vec4 v_color;\n#if USE_TEXTURE\nin vec2 v_uv0;\nuniform sampler2D texture;\n#endif\n#if USE_GRAY\nuniform GrayPhoto {\n float grayLevel;\n};\n#endif\nvoid main () {\n vec4 o = vec4(1, 1, 1, 1);\n #if USE_TEXTURE\n o *= texture(texture, v_uv0);\n #if CC_USE_ALPHA_ATLAS_TEXTURE\n o.a *= texture2D(texture, v_uv0 + vec2(0, 0.5)).r;\n #endif\n #endif\n o *= v_color;\n ALPHA_TEST(o);\n #if USE_GRAY\n vec4 srcColor = o;\n float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;\n vec4 grayColor = vec4(gray, gray, gray, o.a);\n o = mix(srcColor, grayColor, grayLevel);\n #endif\n gl_FragColor = o;\n}"
}
}
],