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glcolorconvert: expose the YUV->RGB glsl function
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5109>
This commit is contained in:
Matthew Waters
GStreamer Marge Bot
parent
b32e2cd9dd
commit
bff5d6d725
3 changed files with 61 additions and 14 deletions
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@ -1569,6 +1569,27 @@ The glcolorconvertelement provides a GStreamer element that uses
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</parameter>
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</parameters>
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</function>
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<function name="yuv_to_rgb_shader_string" c:identifier="gst_gl_color_convert_yuv_to_rgb_shader_string" version="1.24">
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<doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c">The returned glsl function has declaration:
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`vec3 yuv_to_rgb (vec3 rgb, vec3 offset, vec3 ycoeff, vec3 ucoeff, vec3 vcoeff);`
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The Y component is placed in the 0th index of the returned value, The U component in the
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1st, and the V component in the 2nd. offset, ycoeff, ucoeff, and vcoeff are the
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specific coefficients and offset used for the conversion.</doc>
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<source-position filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h"/>
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<return-value transfer-ownership="full">
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<doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c">a glsl function that can be used to convert from
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yuv to rgb</doc>
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<type name="utf8" c:type="gchar*"/>
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</return-value>
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<parameters>
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<parameter name="context" transfer-ownership="none">
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<doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c">a #GstGLContext</doc>
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<type name="GLContext" c:type="GstGLContext*"/>
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</parameter>
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</parameters>
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</function>
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<method name="decide_allocation" c:identifier="gst_gl_color_convert_decide_allocation" version="1.8">
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<doc xml:space="preserve" filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.c">Provides an implementation of #GstBaseTransformClass.decide_allocation()</doc>
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<source-position filename="../subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcolorconvert.h"/>
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@ -158,25 +158,25 @@ struct shader_templ
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GstGLTextureTarget target;
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};
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#define glsl_func_yuv_to_rgb \
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"vec3 yuv_to_rgb (vec3 val, vec3 offset, vec3 ycoeff, vec3 ucoeff, vec3 vcoeff) {\n" \
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static const char glsl_func_yuv_to_rgb[] = \
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"vec3 yuv_to_rgb (vec3 yuv, vec3 offset, vec3 ycoeff, vec3 ucoeff, vec3 vcoeff) {\n" \
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" vec3 rgb;\n" \
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" val += offset;\n" \
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" rgb.r = dot(val, ycoeff);\n" \
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" rgb.g = dot(val, ucoeff);\n" \
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" rgb.b = dot(val, vcoeff);\n" \
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" yuv += offset;\n" \
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" rgb.r = dot(yuv, ycoeff);\n" \
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" rgb.g = dot(yuv, ucoeff);\n" \
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" rgb.b = dot(yuv, vcoeff);\n" \
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" return rgb;\n" \
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"}\n"
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"}\n";
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#define glsl_func_rgb_to_yuv \
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"vec3 rgb_to_yuv (vec3 val, vec3 offset, vec3 rcoeff, vec3 gcoeff, vec3 bcoeff) {\n" \
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static const char glsl_func_rgb_to_yuv[] = \
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"vec3 rgb_to_yuv (vec3 rgb, vec3 offset, vec3 rcoeff, vec3 gcoeff, vec3 bcoeff) {\n" \
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" vec3 yuv;\n" \
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" yuv.r = dot(val.rgb, rcoeff);\n" \
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" yuv.g = dot(val.rgb, gcoeff);\n" \
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" yuv.b = dot(val.rgb, bcoeff);\n" \
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" yuv.r = dot(rgb.rgb, rcoeff);\n" \
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" yuv.g = dot(rgb.rgb, gcoeff);\n" \
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" yuv.b = dot(rgb.rgb, bcoeff);\n" \
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" yuv += offset;\n" \
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" return yuv;\n" \
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"}\n"
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"}\n";
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static const char glsl_func_swizzle[] = "vec4 swizzle(vec4 texel, int[4] components) {\n" \
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" return vec4(texel[components[0]], texel[components[1]], texel[components[2]], texel[components[3]]);\n" \
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@ -190,7 +190,7 @@ static const char glsl_func_swizzle[] = "vec4 swizzle(vec4 texel, int[4] compone
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"vec2 swizzle2(vec3 texel, int[3] components) {\n" \
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" return vec2(texel[components[0]], texel[components[1]]);\n" \
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"}\n" \
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"vec2 swizzle2(vec4 texel, int[3] components) {\n" \
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"vec2 swizzle2(vec4 texel, int[4] components) {\n" \
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" return vec2(texel[components[0]], texel[components[1]]);\n" \
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"}\n" \
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"vec3 swizzle3(vec4 texel, int[4] components) {\n" \
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@ -3257,3 +3257,26 @@ _do_convert_draw (GstGLContext * context, GstGLColorConvert * convert)
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return ret;
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}
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/**
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* gst_gl_color_convert_yuv_to_rgb_shader_string:
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* @context: a #GstGLContext
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*
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* The returned glsl function has declaration:
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*
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* `vec3 yuv_to_rgb (vec3 rgb, vec3 offset, vec3 ycoeff, vec3 ucoeff, vec3 vcoeff);`
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*
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* The Y component is placed in the 0th index of the returned value, The U component in the
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* 1st, and the V component in the 2nd. offset, ycoeff, ucoeff, and vcoeff are the
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* specific coefficients and offset used for the conversion.
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*
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* Returns: (transfer full): a glsl function that can be used to convert from
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* yuv to rgb
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*
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* Since: 1.24
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*/
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gchar *
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gst_gl_color_convert_yuv_to_rgb_shader_string (GstGLContext * context)
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{
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return g_strdup (glsl_func_yuv_to_rgb);
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}
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@ -151,6 +151,9 @@ gboolean gst_gl_color_convert_decide_allocation (GstGLColorConvert * conver
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GST_GL_API
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GstBuffer * gst_gl_color_convert_perform (GstGLColorConvert * convert, GstBuffer * inbuf);
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GST_GL_API
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gchar * gst_gl_color_convert_yuv_to_rgb_shader_string (GstGLContext * context);
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G_END_DECLS
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#endif /* __GST_GL_COLOR_CONVERT_H__ */
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