Interface basic renderer drawing functions

3 files changed, 143 insertions, 26 deletions

diff --git a/include/util.hpp b/include/util.hpp
new file mode 100644
index 0000000..c6a7aec
--- /dev/null
+++ b/include/util.hpp
@@ -0,0 +1,27 @@
+#include "debug.hpp"
+
+extern "C" {
+#include <SDL2/SDL_error.h>
+}
+
+namespace wsdl2 {
+    namespace util {
+        // constexpr inline bool sdl_bool(SDL_bool b) {
+        //     return b == SDL_TRUE;
+        // }
+
+        // constexpr inline SDL_bool sdl_bool(bool b) {
+        //     return (b) ? SDL_TRUE : SDL_FALSE;
+        // }
+
+        constexpr inline bool check(bool expr) {
+#ifdef DEBUG
+            if (!expr) {
+                npdebug("an internal SDL error occurred:");
+                npdebug("  ", const_cast<const char * const>(SDL_GetError()));
+            }
+#endif
+            return expr;
+        }
+    }
+}
\ No newline at end of file
diff --git a/include/video.hpp b/include/video.hpp
index 23c1c6e..dc315ed 100644
--- a/include/video.hpp
+++ b/include/video.hpp
@@ -1,7 +1,10 @@
 #pragma once
 
+#include "util.hpp"
+
 #include <string>
 #include <array>
+#include <type_traits>
 
 extern "C" {
 #include <SDL2/SDL_video.h>
@@ -9,11 +12,17 @@ extern "C" {
 }
 
 namespace wsdl2 {
-    typedef SDL_Point point;
-    typedef SDL_Rect rect;
-
+    // forward declarations
     class window;
 
+    // name aliases
+    using rect = SDL_Rect;
+    using point = SDL_Point;
+
+    struct color {
+        std::uint8_t r, g, b, a;
+    };
+
     class renderer {
     public:
         friend class window;
@@ -21,23 +30,113 @@ namespace wsdl2 {
         renderer(window& w);
         virtual ~renderer();
 
-        inline void clear() { SDL_RenderClear(safe()); }
-        inline void present() { SDL_RenderPresent(safe()); }
+        inline void clear() { SDL_RenderClear(sdl()); }
+        inline void present() { SDL_RenderPresent(sdl()); }
+
+        // set color
+
+        inline void set_color(std::uint8_t r, std::uint8_t g, std::uint8_t b, std::uint8_t a) {
+            util::check(0 == SDL_SetRenderDrawColor(sdl(), r, g, b, a));
+        }
+
+        inline void set_color(const color& c) {
+            set_color(c.r, c.g, c.b, c.a);
+        }
+
+        inline color get_color() {
+            color c;
+            util::check(0 == SDL_GetRenderDrawColor(sdl(), &c.r, &c.g, &c.b, &c.a));
+            return c;
+        }
+
+        // draw a single element
+
+        inline void draw_point(int x, int y) {
+            util::check(0 == SDL_RenderDrawPoint(sdl(), x, y));
+        }
+
+        inline void draw_point(const point& p) {
+            draw_point(p.x, p.y);
+        }
+
+        inline void draw_line(int x1, int y1, int x2, int y2) {
+            util::check(0 == SDL_RenderDrawLine(sdl(), x1, y1, x2, y2));
+        };
+
+        inline void draw_line(const point& a, const point& b) {
+            draw_line(a.x, a.y, b.x, b.y);
+        };
+
+        inline void draw_rect(int x, int y, int h, int w) {
+            draw_rect(rect {x, y, h, w});
+        }
+
+        inline void draw_rect(const rect& rect) {
+            util::check(0 == SDL_RenderDrawRect(sdl(), &rect));
+        }
+
+        inline void fill_rect(const rect& rect) {
+            util::check(0 == SDL_RenderFillRect(sdl(), &rect));
+        }
+
+        // draw multiple elements
+
+        template<template<typename> typename Container>
+        inline void draw_lines(const Container<point>& points) {
+            util::check(0 == SDL_RenderDrawLines(sdl(), points.data(), points.size()));
+        }
+
+        template<template<typename> typename Container>
+        inline void draw_points(const Container<point>& points) {
+            util::check(0 == SDL_RenderDrawLines(sdl(), points.data(), points.size()));
+        }
+
+        template<template<typename> typename Container>
+        inline void draw_rects(const Container<rect>& rects) {
+            util::check(0 == SDL_RenderDrawLines(sdl(), rects.data(), rects.size()));
+        }
+
+        template<template<typename> typename Container>
+        inline void fill_rects(const Container<rect>& rects) {
+            util::check(0 == SDL_RenderFillRects(sdl(), rects.data(), rects.size()));
+        }
+
+        // overloaded drawing function
+
+        inline void draw(const point& p) { draw_point(p); }
+        inline void draw(const rect& r)  { draw_rect(r); }
+        inline void fill(const rect& r)  { fill_rect(r); }
+
+        template<template<typename> typename Container>
+        inline void draw(const Container<point>& points) {
+            draw_points(points);
+        }
+
+        template<template<typename> typename Container>
+        inline void draw(const Container<rect>& rects) {
+            draw_rects(rects);
+        }
+
+        template<template<typename> typename Container>
+        inline void fill(const Container<rect>& rects) {
+            fill_rects(rects);
+        }
 
-        // dirty C code
-        inline SDL_Renderer* sdl() { return m_renderer; }
 
     private:
-        renderer();
+        SDL_Renderer *m_renderer;
 
-        SDL_Renderer* safe();
+        renderer();
         void create_sdl_renderer(SDL_Window *win);
 
-        SDL_Renderer *m_renderer;
+        // dirty C code
+        SDL_Renderer* sdl();
     };
 
     class window {
     public:
+        friend class renderer;
+
         window() = delete;
         window(const window& other) = delete;
 
@@ -48,24 +147,25 @@ namespace wsdl2 {
         void open();
         void close();
 
-        inline void show() { SDL_ShowWindow(m_window); }
-        inline void hide() { SDL_HideWindow(m_window); }
-        inline void raise() { SDL_RaiseWindow(m_window); }
+        inline void show() { SDL_ShowWindow(sdl()); }
+        inline void hide() { SDL_HideWindow(sdl()); }
+        inline void raise() { SDL_RaiseWindow(sdl()); }
 
         // getters
         bool is_open();
         bool is_visible();
 
         // rendering
+        renderer& get_renderer() { return m_renderer; }
         void update();
 
-        // dirty C code
-        inline SDL_Window* sdl() { return m_window; }
-
     private:
         bool m_open;
         renderer m_renderer;
         SDL_Window *m_window;
+
+        // dirty C code
+        SDL_Window* sdl();
     };
 
 
diff --git a/include/wsdl2.hpp b/include/wsdl2.hpp
index 16564ac..5761d07 100644
--- a/include/wsdl2.hpp
+++ b/include/wsdl2.hpp
@@ -7,16 +7,6 @@ extern "C" {
 namespace wsdl2 {
     bool initialize(void);
     void quit(void);
-
-    namespace util {
-        constexpr inline bool sdl_bool(SDL_bool b) {
-            return b == SDL_TRUE;
-        }
-
-        constexpr inline SDL_bool sdl_bool(bool b) {
-            return (b) ? SDL_TRUE : SDL_FALSE;
-        }
-    }
     
     // tool functions
     void delay(unsigned ms);