1 /**
2 * Copyright (c) 2006-2016 LOVE Development Team
3 *
4 * This software is provided 'as-is', without any express or implied
5 * warranty. In no event will the authors be held liable for any damages
6 * arising from the use of this software.
7 *
8 * Permission is granted to anyone to use this software for any purpose,
9 * including commercial applications, and to alter it and redistribute it
10 * freely, subject to the following restrictions:
11 *
12 * 1. The origin of this software must not be misrepresented; you must not
13 * claim that you wrote the original software. If you use this software
14 * in a product, an acknowledgment in the product documentation would be
15 * appreciated but is not required.
16 * 2. Altered source versions must be plainly marked as such, and must not be
17 * misrepresented as being the original software.
18 * 3. This notice may not be removed or altered from any source distribution.
19 **/
20
21 #include "wrap_Canvas.h"
22 #include "Graphics.h"
23
24 namespace love
25 {
26 namespace graphics
27 {
28 namespace opengl
29 {
30
luax_checkcanvas(lua_State * L,int idx)31 Canvas *luax_checkcanvas(lua_State *L, int idx)
32 {
33 return luax_checktype<Canvas>(L, idx, GRAPHICS_CANVAS_ID);
34 }
35
w_Canvas_renderTo(lua_State * L)36 int w_Canvas_renderTo(lua_State *L)
37 {
38 Canvas *canvas = luax_checkcanvas(L, 1);
39 luaL_checktype(L, 2, LUA_TFUNCTION);
40
41 auto graphics = Module::getInstance<Graphics>(Module::M_GRAPHICS);
42
43 if (graphics)
44 {
45 // Save the current Canvas so we can restore it when we're done.
46 std::vector<Canvas *> oldcanvases = graphics->getCanvas();
47
48 for (Canvas *c : oldcanvases)
49 c->retain();
50
51 luax_catchexcept(L, [&](){ graphics->setCanvas(canvas); });
52
53 lua_settop(L, 2); // make sure the function is on top of the stack
54 int status = lua_pcall(L, 0, 0, 0);
55
56 graphics->setCanvas(oldcanvases);
57
58 for (Canvas *c : oldcanvases)
59 c->release();
60
61 if (status != 0)
62 return lua_error(L);
63 }
64
65 return 0;
66 }
67
w_Canvas_newImageData(lua_State * L)68 int w_Canvas_newImageData(lua_State *L)
69 {
70 Canvas *canvas = luax_checkcanvas(L, 1);
71 love::image::Image *image = luax_getmodule<love::image::Image>(L, MODULE_IMAGE_ID);
72 int x = (int) luaL_optnumber(L, 2, 0);
73 int y = (int) luaL_optnumber(L, 3, 0);
74 int w = (int) luaL_optnumber(L, 4, canvas->getWidth());
75 int h = (int) luaL_optnumber(L, 5, canvas->getHeight());
76
77 love::image::ImageData *img = nullptr;
78 luax_catchexcept(L, [&](){ img = canvas->newImageData(image, x, y, w, h); });
79
80 luax_pushtype(L, IMAGE_IMAGE_DATA_ID, img);
81 img->release();
82 return 1;
83 }
84
w_Canvas_getFormat(lua_State * L)85 int w_Canvas_getFormat(lua_State *L)
86 {
87 Canvas *canvas = luax_checkcanvas(L, 1);
88 Canvas::Format format = canvas->getTextureFormat();
89 const char *str;
90 if (!Canvas::getConstant(format, str))
91 return luaL_error(L, "Unknown Canvas format.");
92
93 lua_pushstring(L, str);
94 return 1;
95 }
96
w_Canvas_getMSAA(lua_State * L)97 int w_Canvas_getMSAA(lua_State *L)
98 {
99 Canvas *canvas = luax_checkcanvas(L, 1);
100 lua_pushinteger(L, canvas->getMSAA());
101 return 1;
102 }
103
104 static const luaL_Reg w_Canvas_functions[] =
105 {
106 { "renderTo", w_Canvas_renderTo },
107 { "newImageData", w_Canvas_newImageData },
108 { "getFormat", w_Canvas_getFormat },
109 { "getMSAA", w_Canvas_getMSAA },
110 { 0, 0 }
111 };
112
luaopen_canvas(lua_State * L)113 extern "C" int luaopen_canvas(lua_State *L)
114 {
115 return luax_register_type(L, GRAPHICS_CANVAS_ID, "Canvas", w_Texture_functions, w_Canvas_functions, nullptr);
116 }
117
118 } // opengl
119 } // graphics
120 } // love
121