start qv4l2 v. 1.32.0 and push "Single Step" button. Ubuntu 26.04
```
$ qv4l2
OpenGL Error 0x500: InitializeGL.
OpenGL Error 0x502: Render settings.
.
OpenGL Error 0x502: RGB shader.
QOpenGLShader::compile(Fragment): 0(1) : error C7573: OpenGL/ES requires
precision specifier on this float type (there is no default precision)
0(1) : error C7614: OpenGL/ES doesn't allow use of reserved word gl_TexCoord
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
*** Problematic Fragment shader source code ***
#ifdef GL_KHR_blend_equation_advanced
#extension GL_ARB_fragment_coord_conventions : enable
#extension GL_KHR_blend_equation_advanced : enable
#endif
#line 1
uniform sampler2D tex;uniform float tex_h;void main(){ vec2 xy =
vec2(gl_TexCoord[0].xy); float ycoord = floor(xy.y * tex_h); vec4 color =
texture2D(tex, xy); float a = color.a; float r = color.r; float g =
color.g; float b = color.b; r = (r <= -0.081) ? -pow((r - 0.099) / -1.099,
1.0 / 0.45) : ((r < 0.081) ? r / 4.5 : pow((r + 0.099) / 1.099, 1.0 /
0.45)); g = (g <= -0.081) ? -pow((g - 0.099) / -1.099, 1.0 / 0.45) :
((g < 0.081) ? g / 4.5 : pow((g + 0.099) / 1.099, 1.0 / 0.45)); b = (b <=
-0.081) ? -pow((b - 0.099) / -1.099, 1.0 / 0.45) : ((b < 0.081) ? b /
4.5 : pow((b + 0.099) / 1.099, 1.0 / 0.45)); r = (r < -0.0031308) ? -1.055 *
pow(-r, 1.0 / 2.4) + 0.055 : ((r <= 0.0031308) ? r * 12.92 : 1.055 *
pow(r, 1.0 / 2.4) - 0.055); g = (g < -0.0031308) ? -1.055 * pow(-g, 1.0 /
2.4) + 0.055 : ((g <= 0.0031308) ? g * 12.92 : 1.055 * pow(g, 1.0 /
2.4) - 0.055); b = (b < -0.0031308) ? -1.055 * pow(-b, 1.0 / 2.4) + 0.055 :
((b <= 0.0031308) ? b * 12.92 : 1.055 * pow(b, 1.0 / 2.4) - 0.055);
gl_FragColor = vec4(r, g, b, 1.0);}
***
OpenGL Error: RGB shader compilation failed.
OpenGL Error 0x502: RGB paint.
OpenGL Error 0x502: RGB paint.
OpenGL Error 0x502: Render settings.
.
OpenGL Error 0x502: RGB shader.
QOpenGLShader::compile(Fragment): 0(1) : error C7573: OpenGL/ES requires
precision specifier on this float type (there is no default precision)
0(1) : error C7614: OpenGL/ES doesn't allow use of reserved word gl_TexCoord
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
0(1) : error C7573: OpenGL/ES requires precision specifier on this float type
(there is no default precision)
*** Problematic Fragment shader source code ***
#ifdef GL_KHR_blend_equation_advanced
#extension GL_ARB_fragment_coord_conventions : enable
#extension GL_KHR_blend_equation_advanced : enable
#endif
#line 1
uniform sampler2D tex;uniform float tex_h;void main(){ vec2 xy =
vec2(gl_TexCoord[0].xy); float ycoord = floor(xy.y * tex_h); vec4 color =
texture2D(tex, xy); float a = color.a; float r = color.r; float g =
color.g; float b = color.b; r = (r <= -0.081) ? -pow((r - 0.099) / -1.099,
1.0 / 0.45) : ((r < 0.081) ? r / 4.5 : pow((r + 0.099) / 1.099, 1.0 /
0.45)); g = (g <= -0.081) ? -pow((g - 0.099) / -1.099, 1.0 / 0.45) :
((g < 0.081) ? g / 4.5 : pow((g + 0.099) / 1.099, 1.0 / 0.45)); b = (b <=
-0.081) ? -pow((b - 0.099) / -1.099, 1.0 / 0.45) : ((b < 0.081) ? b /
4.5 : pow((b + 0.099) / 1.099, 1.0 / 0.45)); r = (r < -0.0031308) ? -1.055 *
pow(-r, 1.0 / 2.4) + 0.055 : ((r <= 0.0031308) ? r * 12.92 : 1.055 *
pow(r, 1.0 / 2.4) - 0.055); g = (g < -0.0031308) ? -1.055 * pow(-g, 1.0 /
2.4) + 0.055 : ((g <= 0.0031308) ? g * 12.92 : 1.055 * pow(g, 1.0 /
2.4) - 0.055); b = (b < -0.0031308) ? -1.055 * pow(-b, 1.0 / 2.4) + 0.055 :
((b <= 0.0031308) ? b * 12.92 : 1.055 * pow(b, 1.0 / 2.4) - 0.055);
gl_FragColor = vec4(r, g, b, 1.0);}
***
OpenGL Error: RGB shader compilation failed.
OpenGL Error 0x502: RGB paint.
OpenGL Error 0x502: RGB paint.
OpenGL Error 0x502: RGB paint.
OpenGL Error 0x502: RGB paint.
OpenGL Error 0x502: RGB paint.
```
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2133933
Title:
qv4l2 strange image on Wayland
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/v4l-utils/+bug/2133933/+subscriptions
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