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
139
140
141
142
143
144
145
146
147
148
|
/* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/scummsys.h"
#if defined(USE_OPENGL_GAME) || defined(USE_OPENGL_SHADERS)
#include "engines/myst3/gfx_opengl_texture.h"
#include "graphics/opengl/context.h"
namespace Myst3 {
// From Bit Twiddling Hacks
static uint32 upperPowerOfTwo(uint32 v) {
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
OpenGLTexture::OpenGLTexture() :
internalFormat(0),
sourceFormat(0),
internalWidth(0),
internalHeight(0),
upsideDown(false) {
glGenTextures(1, &id);
}
OpenGLTexture::OpenGLTexture(const Graphics::Surface *surface) {
width = surface->w;
height = surface->h;
format = surface->format;
upsideDown = false;
// Pad the textures if non power of two support is unavailable
if (OpenGLContext.NPOTSupported) {
internalHeight = height;
internalWidth = width;
} else {
internalHeight = upperPowerOfTwo(height);
internalWidth = upperPowerOfTwo(width);
}
if (format.bytesPerPixel == 4) {
assert(surface->format == getRGBAPixelFormat());
internalFormat = GL_RGBA;
sourceFormat = GL_UNSIGNED_BYTE;
} else if (format.bytesPerPixel == 2) {
internalFormat = GL_RGB;
sourceFormat = GL_UNSIGNED_SHORT_5_6_5;
} else
error("Unknown pixel format");
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, internalWidth, internalHeight, 0, internalFormat, sourceFormat, nullptr);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// TODO: If non power of two textures are unavailable this clamping
// has no effect on the padded sides (resulting in white lines on the edges)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
update(surface);
}
OpenGLTexture::~OpenGLTexture() {
glDeleteTextures(1, &id);
}
void OpenGLTexture::update(const Graphics::Surface *surface) {
updatePartial(surface, Common::Rect(surface->w, surface->h));
}
void OpenGLTexture::updateTexture(const Graphics::Surface *surface, const Common::Rect &rect) {
assert(surface->format == format);
glBindTexture(GL_TEXTURE_2D, id);
if (OpenGLContext.unpackSubImageSupported) {
const Graphics::Surface subArea = surface->getSubArea(rect);
glPixelStorei(GL_UNPACK_ROW_LENGTH, surface->pitch / surface->format.bytesPerPixel);
glTexSubImage2D(GL_TEXTURE_2D, 0, rect.left, rect.top, subArea.w, subArea.h, internalFormat, sourceFormat, const_cast<void *>(subArea.getPixels()));
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
} else {
// GL_UNPACK_ROW_LENGTH is not supported, don't bother and do a full texture update
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, surface->w, surface->h, internalFormat, sourceFormat, const_cast<void *>(surface->getPixels()));
}
}
void OpenGLTexture::updatePartial(const Graphics::Surface *surface, const Common::Rect &rect) {
updateTexture(surface, rect);
}
void OpenGLTexture::copyFromFramebuffer(const Common::Rect &screen) {
internalFormat = GL_RGB;
width = screen.width();
height = screen.height();
upsideDown = true;
// Pad the textures if non power of two support is unavailable
if (OpenGLContext.NPOTSupported) {
internalHeight = height;
internalWidth = width;
} else {
internalHeight = upperPowerOfTwo(height);
internalWidth = upperPowerOfTwo(width);
}
glBindTexture(GL_TEXTURE_2D, id);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, internalWidth, internalHeight, 0, internalFormat, GL_UNSIGNED_BYTE, nullptr);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glCopyTexImage2D(GL_TEXTURE_2D, 0, internalFormat, screen.left, screen.top, internalWidth, internalHeight, 0);
}
} // End of namespace Myst3
#endif
|
