link programs before getting uniform locations; add Widget#draw_rect; fix GL.draw_rect; store uniforms as GLint

runtime/lib/gl_program.rb

@@ -16,6 +16,7 @@ class GLProgram
         raise NotImplementedError.new("Other arguments not yet implemented")
       end
     end
+    link
     options.each do |option, value|
       case option
       when :uniforms
@@ -26,6 +27,5 @@ class GLProgram
         raise "Unknown option #{option.inspect}"
       end
     end
-    link
   end
 end

runtime/lib/widget.rb

@@ -30,4 +30,8 @@ module Widget
 
   def render_end
   end
+
+  def draw_rect(x, y, width, height, r, g, b, a)
+    GL.draw_rect(@x + x, @y + y, width, height, r, g, b, a)
+  end
 end

src/GL.cc

@@ -46,7 +46,7 @@ void GL_Init()
 {
     ruby_module = rb_define_module("GL");
     rb_define_singleton_method(ruby_module, "draw_rect",
-                               (VALUE(*)(...))GL_draw_rect, 4);
+                               (VALUE(*)(...))GL_draw_rect, 8);
 }
 
 static void load_gl_buffers()

src/GLProgram.h

@@ -17,7 +17,7 @@ enum
 struct GLProgram
 {
     GLuint id;
-    std::unordered_map<int, GLuint> uniforms;
+    std::unordered_map<int, GLint> uniforms;
 };
 
 void GLProgram_Init();