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eglglessink: Documentation: GLSL Shaders

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Brief explanatory comments plus some rerdering
to group packed/planar converters.
This commit is contained in:
Reynaldo H. Verdejo Pinochet 2012-10-09 11:48:09 -03:00 committed by Sebastian Dröge
parent 731be48dac
commit 95a223a030
1 changed files with 58 additions and 45 deletions
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103
ext/eglgles/gsteglglessink.c
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@ -168,6 +168,15 @@ static PFNGLEGLIMAGETARGETTEXTURE2DOESPROC my_glEGLImageTargetTexture2DOES;
#endif #endif
/* *INDENT-OFF* */ /* *INDENT-OFF* */
/* GLESv2 GLSL Shaders
*
* OpenGL ES Standard does not mandate YUV support. This is
* why most of these shaders deal with Packed/Planar YUV->RGB
* conversion.
*/
/* Direct vertex copy */
static const char *vert_COPY_prog = { static const char *vert_COPY_prog = {
"attribute vec3 position;" "attribute vec3 position;"
"attribute vec2 texpos;" "attribute vec2 texpos;"
@ -179,6 +188,7 @@ static const char *vert_COPY_prog = {
"}" "}"
}; };
/* Direct fragments copy */
static const char *frag_COPY_prog = { static const char *frag_COPY_prog = {
"precision mediump float;" "precision mediump float;"
"varying vec2 opos;" "varying vec2 opos;"
@ -190,6 +200,7 @@ static const char *frag_COPY_prog = {
"}" "}"
}; };
/* Channel reordering for XYZ <-> ZYX conversion */
static const char *frag_REORDER_prog = { static const char *frag_REORDER_prog = {
"precision mediump float;" "precision mediump float;"
"varying vec2 opos;" "varying vec2 opos;"
@ -201,7 +212,9 @@ static const char *frag_REORDER_prog = {
"}" "}"
}; };
/* From gst-plugins-gl */ /* Packed YUV converters */
/** From gst-plugins-gl: AYUV to RGB conversion */
static const char *frag_AYUV_prog = { static const char *frag_AYUV_prog = {
"precision mediump float;" "precision mediump float;"
"varying vec2 opos;" "varying vec2 opos;"
@ -222,46 +235,7 @@ static const char *frag_AYUV_prog = {
"}" "}"
}; };
static const char *frag_PLANAR_YUV_prog = { /** YUY2/UYVY to RGB conversion */
"precision mediump float;"
"varying vec2 opos;"
"uniform sampler2D Ytex,Utex,Vtex;"
"void main(void) {"
" float r,g,b,y,u,v;"
" vec2 nxy = opos.xy;"
" y=texture2D(Ytex,nxy).r;"
" u=texture2D(Utex,nxy).r;"
" v=texture2D(Vtex,nxy).r;"
" y=1.1643*(y-0.0625);"
" u=u-0.5;"
" v=v-0.5;"
" r=y+1.5958*v;"
" g=y-0.39173*u-0.81290*v;"
" b=y+2.017*u;"
" gl_FragColor=vec4(r,g,b,1.0);"
"}"
};
static const char *frag_NV12_NV21_prog = {
"precision mediump float;"
"varying vec2 opos;"
"uniform sampler2D Ytex,UVtex;"
"void main(void) {"
" float r,g,b,y,u,v;"
" vec2 nxy = opos.xy;"
" y=texture2D(Ytex,nxy).r;"
" u=texture2D(UVtex,nxy).%c;"
" v=texture2D(UVtex,nxy).%c;"
" y=1.1643*(y-0.0625);"
" u=u-0.5;"
" v=v-0.5;"
" r=y+1.5958*v;"
" g=y-0.39173*u-0.81290*v;"
" b=y+2.017*u;"
" gl_FragColor=vec4(r,g,b,1.0);"
"}"
};
static const char *frag_YUY2_UYVY_prog = { static const char *frag_YUY2_UYVY_prog = {
"precision mediump float;" "precision mediump float;"
"varying vec2 opos;" "varying vec2 opos;"
@ -283,13 +257,52 @@ static const char *frag_YUY2_UYVY_prog = {
"}" "}"
}; };
/* Planar YUV converters */
/** YUV to RGB conversion */
static const char *frag_PLANAR_YUV_prog = {
"precision mediump float;"
"varying vec2 opos;"
"uniform sampler2D Ytex,Utex,Vtex;"
"void main(void) {"
" float r,g,b,y,u,v;"
" vec2 nxy = opos.xy;"
" y=texture2D(Ytex,nxy).r;"
" u=texture2D(Utex,nxy).r;"
" v=texture2D(Vtex,nxy).r;"
" y=1.1643*(y-0.0625);"
" u=u-0.5;"
" v=v-0.5;"
" r=y+1.5958*v;"
" g=y-0.39173*u-0.81290*v;"
" b=y+2.017*u;"
" gl_FragColor=vec4(r,g,b,1.0);"
"}"
};
/** NV12/NV21 to RGB conversion */
static const char *frag_NV12_NV21_prog = {
"precision mediump float;"
"varying vec2 opos;"
"uniform sampler2D Ytex,UVtex;"
"void main(void) {"
" float r,g,b,y,u,v;"
" vec2 nxy = opos.xy;"
" y=texture2D(Ytex,nxy).r;"
" u=texture2D(UVtex,nxy).%c;"
" v=texture2D(UVtex,nxy).%c;"
" y=1.1643*(y-0.0625);"
" u=u-0.5;"
" v=v-0.5;"
" r=y+1.5958*v;"
" g=y-0.39173*u-0.81290*v;"
" b=y+2.017*u;"
" gl_FragColor=vec4(r,g,b,1.0);"
"}"
};
/* *INDENT-ON* */ /* *INDENT-ON* */
/* Input capabilities. /* Input capabilities. */
*
* Note: OpenGL ES Standard does not mandate YUV support.
*/
static GstStaticPadTemplate gst_eglglessink_sink_template_factory = static GstStaticPadTemplate gst_eglglessink_sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink", GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK, GST_PAD_SINK,