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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/* ResidualVM - A 3D game interpreter
*
* ResidualVM 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 "graphics/opengl/context.h"
#include "common/debug.h"
#include "common/str.h"
#include "common/textconsole.h"
#include "common/tokenizer.h"
#include "graphics/opengl/system_headers.h"
#ifdef USE_OPENGL
namespace Common {
DECLARE_SINGLETON(OpenGL::Context);
}
namespace OpenGL {
Context::Context() {
reset();
}
void Context::reset() {
maxTextureSize = 0;
NPOTSupported = false;
shadersSupported = false;
framebufferObjectSupported = false;
packedDepthStencilSupported = false;
unpackSubImageSupported = false;
framebufferObjectMultisampleSupported = false;
multisampleMaxSamples = -1;
}
void Context::initialize(ContextType contextType) {
// Initialize default state.
reset();
type = contextType;
// Obtain maximum texture size.
glGetIntegerv(GL_MAX_TEXTURE_SIZE, (GLint *)&maxTextureSize);
debug(5, "OpenGL maximum texture size: %d", maxTextureSize);
const char *extString = (const char *)glGetString(GL_EXTENSIONS);
bool ARBShaderObjects = false;
bool ARBShadingLanguage100 = false;
bool ARBVertexShader = false;
bool ARBFragmentShader = false;
bool EXTFramebufferMultisample = false;
bool EXTFramebufferBlit = false;
Common::StringTokenizer tokenizer(extString, " ");
while (!tokenizer.empty()) {
Common::String token = tokenizer.nextToken();
if (token == "GL_ARB_texture_non_power_of_two" || token == "GL_OES_texture_npot") {
NPOTSupported = true;
} else if (token == "GL_ARB_shader_objects") {
ARBShaderObjects = true;
} else if (token == "GL_ARB_shading_language_100") {
ARBShadingLanguage100 = true;
} else if (token == "GL_ARB_vertex_shader") {
ARBVertexShader = true;
} else if (token == "GL_ARB_fragment_shader") {
ARBFragmentShader = true;
} else if (token == "GL_EXT_framebuffer_object") {
framebufferObjectSupported = true;
} else if (token == "GL_EXT_packed_depth_stencil" || token == "GL_OES_packed_depth_stencil") {
packedDepthStencilSupported = true;
} else if (token == "GL_EXT_unpack_subimage") {
unpackSubImageSupported = true;
} else if (token == "GL_EXT_framebuffer_multisample") {
EXTFramebufferMultisample = true;
} else if (token == "GL_EXT_framebuffer_blit") {
EXTFramebufferBlit = true;
}
}
int glslVersion = getGLSLVersion();
debug(5, "OpenGL GLSL version: %d", glslVersion);
if (type == kContextGLES2) {
// GLES2 always has (limited) NPOT support.
NPOTSupported = true;
// GLES2 always has shader support.
shadersSupported = true;
// GLES2 always has FBO support.
framebufferObjectSupported = true;
// ResidualVM does not support multisample FBOs with GLES2 for now
framebufferObjectMultisampleSupported = false;
multisampleMaxSamples = -1;
} else {
shadersSupported = ARBShaderObjects && ARBShadingLanguage100 && ARBVertexShader && ARBFragmentShader && glslVersion >= 120;
// Desktop GL always has unpack sub-image support
unpackSubImageSupported = true;
framebufferObjectMultisampleSupported = EXTFramebufferMultisample && EXTFramebufferBlit;
if (framebufferObjectMultisampleSupported) {
glGetIntegerv(GL_MAX_SAMPLES, (GLint *)&multisampleMaxSamples);
}
}
// Log context type.
switch (type) {
case kContextGL:
debug(5, "OpenGL: GL context initialized");
break;
case kContextGLES2:
debug(5, "OpenGL: GLES2 context initialized");
break;
}
// Log features supported by GL context.
debug(5, "OpenGL: NPOT texture support: %d", NPOTSupported);
debug(5, "OpenGL: Shader support: %d", shadersSupported);
debug(5, "OpenGL: FBO support: %d", framebufferObjectSupported);
debug(5, "OpenGL: Packed depth stencil support: %d", packedDepthStencilSupported);
debug(5, "OpenGL: Unpack subimage support: %d", unpackSubImageSupported);
}
int Context::getGLSLVersion() const {
const char *glslVersionString = (const char *)glGetString(GL_SHADING_LANGUAGE_VERSION);
if (!glslVersionString) {
warning("Could not get GLSL version");
return 0;
}
const char *glslVersionFormat;
if (type == kContextGL) {
glslVersionFormat = "%d.%d";
} else {
glslVersionFormat = "OpenGL ES GLSL ES %d.%d";
}
int glslMajorVersion, glslMinorVersion;
if (sscanf(glslVersionString, glslVersionFormat, &glslMajorVersion, &glslMinorVersion) != 2) {
warning("Could not parse GLSL version '%s'", glslVersionString);
return 0;
}
return glslMajorVersion * 100 + glslMinorVersion;
}
} // End of namespace OpenGL
#endif
|
