[Fix]: Shader linker info log will now display correctly

[andersblomqvist]

Linker error std output

Instead of hard coding the size of the log:

// current
GLchar log[10240];
GLsizei length;
glGetProgramInfoLog(shader_program, 10239, &length, log);

we instead get the size from OpenGL:

// proposed new
GLint max_length = 0;
glGetProgramiv(shader_program, GL_INFO_LOG_LENGTH, &max_length);
std::vector<GLchar> info_log(max_length);
glGetProgramInfoLog(shader_program, max_length, &max_length, &info_log[0]);

This solves the issue where blank space would be printed instead of the actual info message. I encountered this issue when the log was quite long.

Showcase

This example shows the linker log when trying to link my nanorenderer.comp shader.

New output

File Name TextFileRead "C:/Users/ander/Documents/volume_renderer/cppvolrend/openvdb/nanorenderer.comp"
Compute info
------------
0(3496) : warning C7050: "acc.key" might be used before being initialized
0(3496) : warning C7050: "acc.leaf.address.byte_offset" might be used before being initialized
0(3496) : warning C7050: "acc.lower.address.byte_offset" might be used before being initialized
0(3496) : warning C7050: "acc.upper.address.byte_offset" might be used before being initialized
0(3496) : warning C7050: "acc.root.address.byte_offset" might be used before being initialized
0(698) : error C5025: lvalue in array access too complex
0(698) : error C1068: ... or possible array index out of bounds

Error in linking compute shader program

C:\Users\anders\Documents\volume_renderer\bin\Debug\cppvolrend.exe (process 5704) exited with code 41 (0x29).

Old output

File Name TextFileRead "C:/Users/ander/Documents/volume_renderer/cppvolrend/openvdb/nanorenderer.comp"
Error in linking compute shader program
Linker log:


C:\Users\ander\Documents\volume_renderer\bin\Debug\cppvolrend.exe (process 7708) exited with code 41 (0x29).