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
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/scummsys.h"
#include "common/file.h"
#include "common/system.h"
#include "common/rect.h"
#include "graphics/decoders/tga.h"
#include "zvision/render_manager.h"
#include "zvision/lzss_read_stream.h"
namespace ZVision {
RenderManager::RenderManager(OSystem *system, const int width, const int height)
: _system(system),
_width(width),
_height(height),
_renderTable(width, height) {
}
void RenderManager::renderImageToScreen(const Common::String &fileName, uint32 x, uint32 y) {
Common::File file;
if (!file.open(fileName)) {
error("Could not open file %s", fileName.c_str());
return;
}
// Read the magic number
// Some files are true TGA, while others are TGZ
uint32 fileType;
fileType = file.readUint32BE();
// Check for TGZ files
if (fileType == MKTAG('T', 'G', 'Z', '\0')) {
// TGZ files have a header and then Bitmap data that is compressed with LZSS
uint32 decompressedSize = file.readSint32LE();
uint32 width = file.readSint32LE();
uint32 height = file.readSint32LE();
LzssReadStream stream(&file);
byte *buffer = new byte[decompressedSize];
stream.read(buffer, decompressedSize);
_system->copyRectToScreen(buffer, width * 2, x, y, width, height);
delete[] buffer;
} else {
// Reset the cursor
file.seek(0);
// Decode
Graphics::TGADecoder tga;
if (!tga.loadStream(file))
error("Error while reading TGA image");
file.close();
const Graphics::Surface *tgaSurface = tga.getSurface();
_system->copyRectToScreen(tgaSurface->pixels, tgaSurface->pitch, x, y, tgaSurface->w, tgaSurface->h);
tga.destroy();
}
_needsScreenUpdate = true;
}
void RenderManager::generatePanoramaLookupTable() {
float fieldOfView = _panoramaOptions.fieldOfView;
float scale = _panoramaOptions.linearScale;
_renderTable.clear();
double halfWidth = (double)_width / 2.0;
double halfHeight = (double)_height / 2.0;
double fovRadians = (fieldOfView * 3.14159265 / 180.0);
double halfHeightOverTan = halfHeight / tan(fovRadians);
double tanOverHalfHeight = tan(fovRadians) / halfHeight;
for (int32 x = 0; x < _width; x++) {
// Add an offset of 0.01 to overcome zero tan/atan issue (vertical line on half of screen)
double xPos = (double)x - halfWidth + 0.01;
double tempX = atan(xPos*tanOverHalfHeight);
double scaledX = scale * halfHeightOverTan * tempX;
double nn = cos(tempX);
double newHalfWidth = halfHeight * nn * halfHeightOverTan * tanOverHalfHeight*2.0;
int32 newX = floor(scaledX);// + half_w);
double yScale = newHalfWidth / (double)_height;
double et2 = ((double)_height - newHalfWidth) / 2.0;
for (int32 y = 0; y < _height; y++) {
double et1 = (double)y*yScale;
_renderTable(x, y).x = newX; //pixel index
int32 newY = floor(et2 + et1);
_renderTable(x, y).y = newY; //pixel index
}
}
}
} // End of namespace ZVision
|
