1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
// To use emscripten's SDL library here, you need to define
// Module.canvas and at least one of Module.context2D, Module.contextGL.
mergeInto(Library, {
$SDL__deps: ['$Browser'],
$SDL: {
defaults: {
width: 320,
height: 240
},
surfaces: {},
makeSurface: function(width, height, flags) {
var surf = _malloc(14*QUANTUM_SIZE); // SDL_Surface has 14 fields of quantum size
var buffer = _malloc(width*height*4);
IHEAP[surf+QUANTUM_SIZE*0] = flags; // SDL_Surface.flags
IHEAP[surf+QUANTUM_SIZE*1] = 0; // SDL_Surface.format TODO
IHEAP[surf+QUANTUM_SIZE*2] = width; // SDL_Surface.w
IHEAP[surf+QUANTUM_SIZE*3] = height; // SDL_Surface.h
IHEAP[surf+QUANTUM_SIZE*4] = width*4; // SDL_Surface.pitch, assuming RGBA for now, since that is what ImageData gives us in browsers
IHEAP[surf+QUANTUM_SIZE*5] = buffer; // SDL_Surface.pixels
SDL.surfaces[surf] = {
width: width,
height: height,
canvas: Module.canvas,
context: Module.context2D,
surf: surf,
buffer: buffer
};
return surf;
},
},
SDL_Init__deps: ['$SDL'],
SDL_Init: function(what) {
return 0; // success
},
SDL_GetVideoInfo: function() {
// %struct.SDL_VideoInfo = type { i32, i32, %struct.SDL_PixelFormat*, i32, i32 } - 5 fields of quantum size
var ret = _malloc(5*QUANTUM_SIZE);
// TODO: Use macros like in library.js
IHEAP[ret] = 0; // TODO
IHEAP[ret+QUANTUM_SIZE] = 0; // TODO
IHEAP[ret+QUANTUM_SIZE*2] = 0; // TODO
IHEAP[ret+QUANTUM_SIZE*3] = SDL.defaults.width;
IHEAP[ret+QUANTUM_SIZE*4] = SDL.defaults.height;
return ret;
},
SDL_ListModes: function(format, flags) {
return -1; // -1 == all modes are ok. TODO
},
SDL_GL_SetAttribute: function(attr, value) {
// TODO
},
SDL_SetVideoMode: function(width, height, depth, flags) {
return SDL.makeSurface(width, height, flags);
},
SDL_Quit: function() {
return 1;
},
SDL_LockSurface: function(surf) {
var surfData = SDL.surfaces[surf];
surfData.image = surfData.context.getImageData(0, 0, surfData.width, surfData.height);
// Copy pixel data to somewhere accessible to 'C/C++'
var num = surfData.image.data.length;
for (var i = 0; i < num; i++) {
// TODO: Use macros like in library.js
IHEAP[surfData.buffer+i] = surfData.image.data[i];
}
// Mark in C/C++-accessible SDL structure
// SDL_Surface has the following fields: Uint32 flags, SDL_PixelFormat *format; int w, h; Uint16 pitch; void *pixels; ...
// So we have fields all of the same size, and 5 of them before us.
// TODO: Use macros like in library.js
IHEAP[surf + 5*QUANTUM_SIZE] = surfData.buffer;
},
SDL_UnlockSurface: function(surf) {
var surfData = SDL.surfaces[surf];
// Copy pixel data to image
var num = surfData.image.data.length;
for (var i = 0; i < num; i++) {
// TODO: Use macros like in library.js
surfData.image.data[i] = IHEAP[surfData.buffer+i];
}
for (var i = 0; i < num/4; i++) {
surfData.image.data[i*4+3] = 255; // opacity, as canvases blend alpha
}
// Copy to canvas
surfData.context.putImageData(surfData.image, 0, 0);
// Cleanup
surfData.image = null;
},
SDL_Flip: function(surf) {
// We actually do this in Unlock...
},
SDL_Delay: function(delay) {
// No can do... unless you were a generator...
},
SDL_WM_SetCaption: function(title, icon) {
title = Pointer_stringify(title);
icon = Pointer_stringify(icon);
},
SDL_EnableKeyRepeat: function(delay, interval) {
// TODO
},
SDL_ShowCursor: function(toggle) {
// TODO
},
SDL_GetError: function() {
return Pointer_make(intArrayFromString("SDL is cool"), null);
},
IMG_Load: function(filename) {
var format = filename.split('.').slice(-1)[0];
var data = Browser.syncLoad(filename);
var raw = Browser.decodeImage(data, format);
var surf = SDL.makeSurface(raw.width, raw.height, 0);
// XXX Extremely inefficient!
for (var i = 0; i < raw.width*raw.height*4; i++) {
IHEAP[SDL.surfaces[surf].buffer+i] = raw.data[i];
}
return surf;
}
});
|
