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implement selection mask with lasso tool

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omigamedev
2017-10-07 13:35:53 +01:00
parent 41e52b7757
commit 78ec5a079e
16 changed files with 249 additions and 49 deletions
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22
engine/app_shaders.cpp
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@@ -52,6 +52,7 @@ void App::initShaders()
SHADER_VERSION
"uniform sampler2D tex;\n"
"uniform sampler2D tex_stroke;\n"
"uniform sampler2D tex_mask;\n"
"uniform mediump float alpha;\n"
"uniform bool lock;\n"
"in mediump vec3 uv;\n"
@@ -67,19 +68,34 @@ void App::initShaders()
SHADER_VERSION
"uniform sampler2D tex;\n"
"uniform sampler2D tex_stroke;\n"
"uniform sampler2D tex_mask;\n"
"uniform mediump float alpha;\n"
"uniform bool lock;\n"
"uniform bool mask;\n"
"in mediump vec3 uv;\n"
"out mediump vec4 frag;\n"
"mediump vec4 blur(sampler2D t, mediump vec2 uv){\n"
" mediump vec4 sum = texture(t, uv);\n"
" sum += textureOffset(t, uv, ivec2(-1, -1));\n"
" sum += textureOffset(t, uv, ivec2(-1, 0));\n"
" sum += textureOffset(t, uv, ivec2(-1, 1));\n"
" sum += textureOffset(t, uv, ivec2( 0, -1));\n"
" sum += textureOffset(t, uv, ivec2( 0, 1));\n"
" sum += textureOffset(t, uv, ivec2( 1, -1));\n"
" sum += textureOffset(t, uv, ivec2( 1, 0));\n"
" sum += textureOffset(t, uv, ivec2( 1, 1));\n"
" return sum / vec4(9.0);\n"
"}\n"
"void main(){\n"
" mediump vec4 base = texture(tex, uv.xy);\n"
" mediump vec4 stroke = texture(tex_stroke, uv.xy);\n"
" stroke.a = stroke.a * alpha;\n"
" stroke.a = mask ? stroke.a * alpha * blur(tex_mask, uv.xy).r : stroke.a * alpha;\n"
" mediump float contribution = (1.0 - base.a) * stroke.a;\n"
" mediump float alpha_tot = base.a + contribution;"
" mediump vec3 rgb = mix(base.rgb, stroke.rgb, stroke.a / alpha_tot);\n"
" frag = vec4(rgb, lock ? base.a : alpha_tot);\n"
" mediump vec3 rgb = mix(base.rgb, stroke.rgb, (stroke.a / alpha_tot));\n"
" frag = vec4(rgb, (lock ? base.a : alpha_tot));\n"
"}\n";
// TEXTURE ATLAS