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add noise parameter to the brush settings

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omigamedev
2017-11-12 17:02:24 +00:00
parent 5dccd61160
commit e280629cf2
8 changed files with 14 additions and 2 deletions
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3
engine/app_shaders.cpp
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@@ -258,6 +258,7 @@ void App::initShaders()
"uniform mediump vec4 col;\n"
"uniform mediump vec2 resolution;\n"
"uniform mediump float alpha;\n"
"uniform mediump float noise;\n"
"uniform mediump vec2 stencil_offset;\n"
"uniform mediump float stencil_alpha;\n"
"uniform mediump float wet;\n"
@@ -268,6 +269,7 @@ void App::initShaders()
#else
"out mediump vec4 frag;\n"
#endif
"mediump float rand(vec2 co) { return fract(sin(dot(co.xy, vec2(12.9898, 78.233))) * 43758.5453); }\n"
"void main(){\n"
" mediump vec2 uv2 = gl_FragCoord.st / resolution;\n"
" mediump float stencil = 1.0 - (texture(tex_stencil, (uv2+stencil_offset) * 2.0).r * 0.9) * stencil_alpha;\n"
@@ -278,6 +280,7 @@ void App::initShaders()
#else
" mediump vec4 bg = texture(tex_bg, uv2);\n"
#endif
" fg.a *= 1.0-rand(uv2+uv)*noise;\n"
" if (fg.a == 0.0) discard;\n"
" mediump float contribution = (1.0 - bg.a) * fg.a * stencil;\n"
" mediump float alpha_tot = bg.a + contribution;"