From 584b65041ccb4f54c4da3fd8fda7cf655d3b1da5 Mon Sep 17 00:00:00 2001
From: Raimon Zamora <jaildoctor@gmail.com>
Date: Tue, 4 Jul 2023 23:03:19 +0200
Subject: [PATCH] - [NEW] view(x,y,w,h) Creates a clipped viewport that also
 translates origin. -[NEW] view() Resets the viewport to all the window.

---
 data/game.lua |  5 +++++
 lua.cpp       | 14 ++++++++++++++
 mini.cpp      | 17 +++++++++++++++--
 mini.h        |  2 ++
 4 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/data/game.lua b/data/game.lua
index 607a15a..701e050 100644
--- a/data/game.lua
+++ b/data/game.lua
@@ -11,7 +11,12 @@ function _update()
 end
 
 function normal_update()
+    view()
+
     cls(20)
+    view(10,10,140,100)
+    cls(3)
+    prnt("HOLA",0,0)
     prnt(text,x,60)
     if btnp(keyRight) then x=x+1 end
     if btnp(keyLeft) then x=x-1 end
diff --git a/lua.cpp b/lua.cpp
index 003f2e0..4a70e1b 100644
--- a/lua.cpp
+++ b/lua.cpp
@@ -278,6 +278,19 @@ extern "C" {
         return 0;
     }
 
+    static int cpp_view(lua_State *L) {
+        if (lua_gettop(L) == 0) {
+            view();
+        } else {
+            int x = luaL_checknumber(L, 1);
+            int y = luaL_checknumber(L, 2);
+            int w = luaL_checknumber(L, 3);
+            int h = luaL_checknumber(L, 4);
+            view(x, y, w, h);
+        }
+        return 0;
+    }
+
     static int cpp_circ(lua_State *L) {
         int x = luaL_checknumber(L, 1);
         int y = luaL_checknumber(L, 2);
@@ -831,6 +844,7 @@ void push_lua_funcs() {
     lua_pushcfunction(L,cpp_print);     lua_setglobal(L, "prnt");
     lua_pushcfunction(L,cpp_clip);      lua_setglobal(L, "clip");
     lua_pushcfunction(L,cpp_camera);    lua_setglobal(L, "camera");
+    lua_pushcfunction(L,cpp_view);      lua_setglobal(L, "view");
     lua_pushcfunction(L,cpp_circ);      lua_setglobal(L, "circ");
     lua_pushcfunction(L,cpp_circfill);  lua_setglobal(L, "circfill");
     lua_pushcfunction(L,cpp_oval);      lua_setglobal(L, "oval");
diff --git a/mini.cpp b/mini.cpp
index cf477f2..195920e 100644
--- a/mini.cpp
+++ b/mini.cpp
@@ -382,8 +382,8 @@ void simple_pset(int x, int y, uint8_t color) {
 }
 
 void cls(uint8_t color) {
-    for (int y=ds::clip[1]; y<ds::clip[3];++y) {
-        for (int x=ds::clip[0]; x<ds::clip[2];++x) {
+    for (int y=ds::clip[1]+ds::cam[1]; y<ds::clip[3]+ds::cam[1];++y) {
+        for (int x=ds::clip[0]+ds::cam[0]; x<ds::clip[2]+ds::cam[0];++x) {
             simple_pset(x,y,color);
         }
     }
@@ -656,6 +656,19 @@ void camera(int x, int y) {
     ds::cam[1] = y;
 }
 
+void view(int x, int y, int w, int h) {
+    ds::cam[0] = -x;
+    ds::cam[1] = -y;
+    ds::clip[0] = x; ds::clip[1] = y; ds::clip[2] = w+x; ds::clip[3] = h+y;
+    ds::clp[0] = x; ds::clp[1] = y; ds::clp[2] = w-1; ds::clp[3] = h-1;
+}
+
+void view() {
+    ds::cam[0] = ds::cam[1] = 0;
+    ds::clip[0] = ds::clip[1] = 0; ds::clip[2] = screen_width; ds::clip[3] = screen_height;
+    ds::clp[0] = ds::clp[1] = 0; ds::clp[2] = screen_width-1; ds::clp[3] = screen_height-1;
+}
+
 void _drawcirc(int xc, int yc, int x, int y) {
     pset(xc+x, yc+y);
     pset(xc-x, yc+y);
diff --git a/mini.h b/mini.h
index dc0ee37..31cdfe5 100644
--- a/mini.h
+++ b/mini.h
@@ -168,6 +168,8 @@ void print(const char *str, int x, int y, uint8_t color);
 void clip(int x, int y, int w, int h);
 void clip();
 void camera(int x, int y);
+void view(int x, int y, int w, int h);
+void view();
 
 void circ(int x, int y, uint8_t r = 4);
 void circ(int x, int y, uint8_t r, uint8_t color);