create and link program, add getProgramLog()

template/test.cc

@@ -11,7 +11,7 @@ using namespace std;
 #define WIDTH   800
 #define HEIGHT  600
 
-GLuint vs, fs;
+GLuint program, vs, fs;
 
 char * loadFile(const char *fname)
 {
@@ -38,6 +38,19 @@ char *getShaderLog(GLuint id)
     return NULL;
 }
 
+char *getProgramLog(GLuint id)
+{
+    GLint log_length;
+    glGetProgramiv(id, GL_INFO_LOG_LENGTH, &log_length);
+    if (log_length > 0)
+    {
+        char *log = new char[log_length];
+        glGetProgramInfoLog(id, log_length, &log_length, log);
+        return log;
+    }
+    return NULL;
+}
+
 GLuint makeShader(GLenum shaderType, const char *fname)
 {
     GLuint id;
@@ -101,6 +114,23 @@ bool init(int width, int height)
         return false;
     }
 
+    program = glCreateProgram();
+    glAttachShader(program, vs);
+    glAttachShader(program, fs);
+    glLinkProgram(program);
+
+    GLint link_status;
+    glGetProgramiv(program, GL_LINK_STATUS, &link_status);
+    if (link_status != GL_TRUE)
+    {
+        char *log = getProgramLog(program);
+        cerr << "Program log:" << endl << log << endl;
+        delete[] log;
+        glDeleteShader(vs);
+        glDeleteShader(fs);
+        return false;
+    }
+
     return true;
 }