omar/panopainter
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

stencil in brush preview

Browse Source
This commit is contained in:
omigamedev
2017-10-22 19:58:20 +01:00
parent 856628162a
commit 2a92beca7b
6 changed files with 49 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
engine/brush.cpp
View File

@@ -107,12 +107,18 @@ bool ui::BrushMesh::create()
static const char* shader_stroke_inst_f =
SHADER_VERSION
"uniform mediump sampler2D tex;"
"uniform mediump sampler2D tex_stencil;\n"
"uniform mediump vec4 col;"
"uniform mediump vec2 resolution;\n"
"uniform mediump vec2 stencil_offset;\n"
"uniform mediump float stencil_alpha;\n"
"in mediump float alpha;"
"in mediump vec3 uv;"
"out mediump vec4 frag;"
"void main(){"
" mediump float a = (1.0 - texture(tex, uv.xy).r) * alpha;"
" mediump vec2 uv2 = gl_FragCoord.st / resolution;\n"
" mediump float stencil = 1.0 - (texture(tex_stencil, (uv2+stencil_offset)).r * 0.9) * stencil_alpha;\n"
" mediump float a = (1.0 - texture(tex, uv.xy).r) * alpha * stencil;"
" frag = vec4(col.rgb, a);"
"}";