add GLBuffer::bind() and GLProgram::use()

src/client/GL/GLBuffer.cc

@@ -16,6 +16,7 @@ GLBuffer::~GLBuffer()
 
 bool GLBuffer::create(GLenum target, GLenum usage, const void *ptr, size_t sz)
 {
+    m_target = target;
     glGenBuffers(1, &m_id);
     if (m_id > 0)
     {

src/client/GL/GLBuffer.h

@@ -11,8 +11,10 @@ class GLBuffer
         ~GLBuffer();
         bool create(GLenum target, GLenum usage, const void *ptr, size_t sz);
         GLuint get_id() { return m_id; }
+        void bind() { glBindBuffer(m_target, m_id); }
     protected:
         GLuint m_id;
+        GLenum m_target;
 };
 
 #endif

src/client/GL/GLProgram.h

@@ -19,6 +19,7 @@ class GLProgram
         GLuint get_id() { return m_id; }
         GLint get_uniform_location(const char *name);
         void get_uniform_locations(const char **names, int num, GLint *locs);
+        void use() { glUseProgram(m_id); }
     protected:
         GLuint m_id;
         GLShader m_v_shader;