Method create

3rdparty/bgfx/src/renderer_gl.cpp:5052–5109

	}

	void ProgramGL::create(const ShaderGL& _vsh, const ShaderGL& _fsh)
	{
		m_id = glCreateProgram();
		BX_TRACE("Program create: GL%d: GL%d, GL%d", m_id, _vsh.m_id, _fsh.m_id);

		const uint64_t id = (uint64_t(_vsh.m_hash)<<32) | _fsh.m_hash;
		const bool cached = s_renderGL->programFetchFromCache(m_id, id);

		if (!cached)
		{
			GLint linked = 0;
			if (0 != _vsh.m_id)
			{
				GL_CHECK(glAttachShader(m_id, _vsh.m_id) );

				if (0 != _fsh.m_id)
				{
					GL_CHECK(glAttachShader(m_id, _fsh.m_id) );
				}

				GL_CHECK(glLinkProgram(m_id) );
				GL_CHECK(glGetProgramiv(m_id, GL_LINK_STATUS, &linked) );

				if (0 == linked)
				{
					char log[1024];
					GL_CHECK(glGetProgramInfoLog(m_id, sizeof(log), NULL, log) );
					BX_TRACE("%d: %s", linked, log);
				}
			}

			if (0 == linked)
			{
				BX_WARN(0 != _vsh.m_id, "Invalid vertex/compute shader.");
				GL_CHECK(glDeleteProgram(m_id) );
				m_usedCount = 0;
				m_id = 0;
				return;
			}

			s_renderGL->programCache(m_id, id);
		}

		init();

		if (!cached
		&&  s_renderGL->m_workaround.m_detachShader)
		{
			// Must be after init, otherwise init might fail to lookup shader
			// info (NVIDIA Tegra 3 OpenGL ES 2.0 14.01003).
			GL_CHECK(glDetachShader(m_id, _vsh.m_id) );

			if (0 != _fsh.m_id)
			{
				GL_CHECK(glDetachShader(m_id, _fsh.m_id) );
			}
		}
	}