mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2025-02-21 13:36:39 +00:00
Code Issues 1 Projects Releases Wiki Activity

eglglessink: GLSL: Planar YUV converters optimization

Browse source 
- Use consts for the transform's offset and cofficients values
- Use dot product instead of mult and add
- Avoid unneeded texture lookups
This commit is contained in:
Reynaldo H. Verdejo Pinochet 2012-10-10 11:50:28 -03:00 committed by Sebastian Dröge
parent 846e77871b
commit 73d865091c
1 changed files with 26 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

46
ext/eglgles/gsteglglessink.c
View file

@ -264,18 +264,21 @@ static const char *frag_PLANAR_YUV_prog = {
"precision mediump float;" "precision mediump float;"
"varying vec2 opos;" "varying vec2 opos;"
"uniform sampler2D Ytex,Utex,Vtex;" "uniform sampler2D Ytex,Utex,Vtex;"
"const vec3 offset = vec3(-0.0625, -0.5, -0.5);"
"const vec3 rcoeff = vec3(1.164, 0.000, 1.596);"
"const vec3 gcoeff = vec3(1.164,-0.391,-0.813);"
"const vec3 bcoeff = vec3(1.164, 2.018, 0.000);"
"void main(void) {" "void main(void) {"
" float r,g,b,y,u,v;" " float r,g,b;"
" vec3 yuv;"
" vec2 nxy = opos.xy;" " vec2 nxy = opos.xy;"
" y=texture2D(Ytex,nxy).r;" " yuv.x=texture2D(Ytex,nxy).r;"
" u=texture2D(Utex,nxy).r;" " yuv.y=texture2D(Utex,nxy).r;"
" v=texture2D(Vtex,nxy).r;" " yuv.z=texture2D(Vtex,nxy).r;"
" y=1.1643*(y-0.0625);" " yuv += offset;"
" u=u-0.5;" " r = dot(yuv, rcoeff);"
" v=v-0.5;" " g = dot(yuv, gcoeff);"
" r=y+1.5958*v;" " b = dot(yuv, bcoeff);"
" g=y-0.39173*u-0.81290*v;"
" b=y+2.017*u;"
" gl_FragColor=vec4(r,g,b,1.0);" " gl_FragColor=vec4(r,g,b,1.0);"
"}" "}"
}; };
@ -285,18 +288,21 @@ static const char *frag_NV12_NV21_prog = {
"precision mediump float;" "precision mediump float;"
"varying vec2 opos;" "varying vec2 opos;"
"uniform sampler2D Ytex,UVtex;" "uniform sampler2D Ytex,UVtex;"
"const vec3 offset = vec3(-0.0625, -0.5, -0.5);"
"const vec3 rcoeff = vec3(1.164, 0.000, 1.596);"
"const vec3 gcoeff = vec3(1.164,-0.391,-0.813);"
"const vec3 bcoeff = vec3(1.164, 2.018, 0.000);"
"void main(void) {" "void main(void) {"
" float r,g,b,y,u,v;" " float r,g,b;"
" vec3 yuv;"
" vec2 nxy = opos.xy;" " vec2 nxy = opos.xy;"
" y=texture2D(Ytex,nxy).r;" " yuv.x=texture2D(Ytex,nxy).r;"
" u=texture2D(UVtex,nxy).%c;" " yuv.y=texture2D(UVtex,nxy).%c;"
" v=texture2D(UVtex,nxy).%c;" " yuv.z=texture2D(UVtex,nxy).%c;"
" y=1.1643*(y-0.0625);" " yuv += offset;"
" u=u-0.5;" " r = dot(yuv, rcoeff);"
" v=v-0.5;" " g = dot(yuv, gcoeff);"
" r=y+1.5958*v;" " b = dot(yuv, bcoeff);"
" g=y-0.39173*u-0.81290*v;"
" b=y+2.017*u;"
" gl_FragColor=vec4(r,g,b,1.0);" " gl_FragColor=vec4(r,g,b,1.0);"
"}" "}"
}; };