Tuesday, March 24th, 2015, 00:37 UTC | ||
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[01:30:44] | Hydr0p0nX: | ok, I think i've sort of figured out the last of the issue i'm having |
[01:46:49] | Hydr0p0nX: | I have noticed that even though I have 4 livetv storage group paths, only one of them seems to be used |
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[09:32:55] | stuarta: | for those like me that know nothing about opengl, there seems to be plenty of good background reading here https://www.opengl.org/wiki/Main_Page |
[09:34:32] | stuartm: | stuarta: seen Jonatan's fix? |
[09:35:01] | stuarta: | yes, and it looks so simple, that even i should be able to understand the basic fragment shader in it |
[09:35:14] | stuarta: | hence me doing some background reading |
[09:35:44] | stuarta: | will have to try it tonight |
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[09:44:29] | stuarta: | i think if i read the opengl wiki, i'll have a good understanding on the graphics pipeline |
[09:51:57] | stuartm: | the shader, a fragment shader, sets the alpha value of the texture to 1.0 (last value to the vector, vec4), i.e. fully opaque, while leaving the R G B colour channels (first three values in the 4 value vector) unchanged |
[09:53:09] | stuartm: | it's almost a no-op |
[09:56:37] | stuarta: | sure, what's s_texture0 (source texture??) and v_texcoord0 (location of vector?) |
[10:10:59] | stuartm: | s_texture0 is the texture sampler associated with our source texture, and v_texcoord0 is the coordinate of a point within that texture |
[10:13:58] | stuartm: | the shader is called for each pixel of the frame |
[10:14:19] | stuartm: | the sampler returns the colours (RGBA) of that pixel |
[10:16:45] | stuartm: | the alternative name for a fragment shader – pixel shader – makes it easier to remember that it works at pixel level |
[10:17:29] | stuartm: | in opengl, 'fragment' == 'pixel' |
[10:20:01] | stuarta: | thanks, that's helpful |
[10:22:25] | stuartm: | vec4.xyz, returns the first three values of the vector – since in this instance it's hold the colour info, that's R, G & B – if you wanted to return them in reverse order you could use .zyx instead |
[10:22:58] | ** stuartm should proof read more ** | |
[10:34:14] | stuarta: | hmm, the doxygen comments for OpenGLVideo::Init don't match, resulting in no documentation in the doxygen output |
[10:34:30] | stuarta: | +for that function |
[10:36:08] | stuartm: | that's why we stopped using "\fn" markup in comments |
[10:36:30] | stuarta: | and thats what it has |
[10:36:31] | stuartm: | change the signature of the method even slightly and the comment block is ignored |
[10:37:00] | stuartm: | remove it, and doxygen automatically associated the comment with the following method |
[10:37:25] | stuarta: | the \param markups stay tho? |
[10:37:56] | stuartm: | yes, in this case they wouldn't all be correct, but the documentation would at least be partially available |
[10:38:34] | stuarta: | that's something i can fix |
[10:38:54] | stuartm: | seems that there is no actual documentation of the purpose of Init – probably since that's considered self-explanatory |
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[23:09:48] | Hydr0p0nX: | i miss the days of the post office being somewhat reliable =/ |
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