123     GLuint program = glCreateProgram();  in buildShaderProgram()  local
124     if (program == 0) {  in buildShaderProgram()
133         glDeleteProgram(program);  in buildShaderProgram()
139         glDeleteProgram(program);  in buildShaderProgram()
143     glAttachShader(program, vertexShader);  in buildShaderProgram()
144     glAttachShader(program, pixelShader);  in buildShaderProgram()
146     glBindAttribLocation(program, 0, "pos");  in buildShaderProgram()
147     glBindAttribLocation(program, 1, "tex");  in buildShaderProgram()
150     glLinkProgram(program);  in buildShaderProgram()
152     glGetProgramiv(program, GL_LINK_STATUS, &linked);  in buildShaderProgram()
156         glGetProgramiv(program, GL_INFO_LOG_LENGTH, &size);  in buildShaderProgram()
160             glGetProgramInfoLog(program, size, nullptr, infoLog);  in buildShaderProgram()
165         glDeleteProgram(program);  in buildShaderProgram()
171     return program;  in buildShaderProgram()