综述

详细内容

软件比对

软件	显示大小	分辨率	帧率	windowed	框架	gpu使用率
vlc	720x480	1920x1080	25		D3D	4
-	1920x1080	1920x1080	25		D3D	8
-	1920x1080	1920x1080	25	全屏	D3D	14
ffplay	720x480	1920x1080	25		OpenGL	14
-	1920x1080	1920x1080	25		OpenGL	18

格式

索引	格式
1	grey
2	y800
3	y8
4	y16
5	rgb15
6	rgb16
7	rgb24
8	rgba
9	argb
10	bgr15
11	bgr16
12	bgr24
13	bgra
14	abgr
15	nv16
16	nv61
17	i422
18	yv16
19	yuy2
20	yuyv
21	uyvy
22	yvyu
23	vyuy
24	i420
25	iyuv
26	nv12
27	yv12
28	nv21
29	p010
30	p210
31	iyu2
32	v308
33	ayuv
34	uyva
35	v408
36	vyua
37	v210
38	y410
39	v410
40	rgb10
41	bgr10

LOD

从 opengl 3.0 开始，提供了 glGenerateMip 函数用于生成 LOD

glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

yuv -> rgb

r = 1.1643*(y-0.0625) + 1.5958*(v-0.5)
= 1.1643y + 0u + 1.15958v + (-0.87066875)
g = 1.1643(y-0.0625) - 0.39173*(u-0.5) - 0.81290*(v-0.5)
= 1.1643y + (-0.39173)u + (-0.81290)v + (0.52954625)
b = 1.1643(y-0.0625) + 2.017(u-0.5)
= 1.1643y + 2.017u + 0v + (-1.08126875)

[r,g,b]=[yuv]MT+MB
MT = {[1.1643,1.1643,1.1643],
[0,-0.39173,2.017],
[1.15958,-0.81290,0]
}
MB = [-0.87066875,0.52954625,-1.08126875]