Repository navigation
Expand file tree
/
Copy pathOpenGL.cpp
More file actions
343 lines (273 loc) · 10 KB
/
Copy pathOpenGL.cpp
File metadata and controls
343 lines (273 loc) · 10 KB
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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
// This file was copied from the bsnes project.
// This is the license info, from ruby.hpp:
/*
ruby
version: 0.08 (2011-11-25)
license: public domain
*/
#include <SDL.h>
#include <SDL_opengl.h>
#include <yaml-cpp/yaml.h>
#include <iostream>
#include <fstream>
#include "OpenGL.h"
#include "Logger.h"
namespace OpenXcom
{
bool OpenGL::checkErrors = true;
std::string strGLError(GLenum glErr)
{
std::string err;
switch(glErr)
{
case GL_INVALID_ENUM:
err = "GL_INVALID_ENUM";
break;
case GL_INVALID_VALUE:
err = "GL_INVALID_VALUE";
break;
case GL_INVALID_OPERATION:
err = "GL_INVALID_OPERATION";
break;
case GL_STACK_OVERFLOW:
err = "GL_STACK_OVERFLOW";
break;
case GL_STACK_UNDERFLOW:
err = "GL_STACK_UNDERFLOW";
break;
case GL_OUT_OF_MEMORY:
err = "GL_OUT_OF_MEMORY";
break;
case GL_NO_ERROR:
err = "No error! How did you even reach this code?";
break;
default:
err = "Unknown error code!";
break;
}
return err;
}
#define glGetProcAddress(name) SDL_GL_GetProcAddress(name)
PFNGLCREATEPROGRAMPROC glCreateProgram = 0;
PFNGLUSEPROGRAMPROC glUseProgram = 0;
PFNGLCREATESHADERPROC glCreateShader = 0;
PFNGLDELETESHADERPROC glDeleteShader = 0;
PFNGLSHADERSOURCEPROC glShaderSource = 0;
PFNGLCOMPILESHADERPROC glCompileShader = 0;
PFNGLATTACHSHADERPROC glAttachShader = 0;
PFNGLDETACHSHADERPROC glDetachShader = 0;
PFNGLLINKPROGRAMPROC glLinkProgram = 0;
PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation = 0;
PFNGLUNIFORM1IPROC glUniform1i = 0;
PFNGLUNIFORM2FVPROC glUniform2fv = 0;
PFNGLUNIFORM4FVPROC glUniform4fv = 0;
void * (APIENTRYP glXGetCurrentDisplay)() = 0;
Uint32 (APIENTRYP glXGetCurrentDrawable)() = 0;
void (APIENTRYP glXSwapIntervalEXT)(void *display, Uint32 GLXDrawable, int interval);
Uint32 (APIENTRYP wglSwapIntervalEXT)(int interval);
void OpenGL::resize(unsigned width, unsigned height) {
if(gltexture == 0) glGenTextures(1, &gltexture);
glErrorCheck();
iwidth = SDL_max(width, iwidth );
iheight = SDL_max(height, iheight);
if(buffer_surface) delete buffer_surface;
buffer_surface = new Surface(iwidth, iheight, 0, 0, ibpp); // use OpenXcom's Surface class to get an aligned buffer with bonus SDL_Surface
buffer = (uint32_t*) buffer_surface->getSurface()->pixels;
glBindTexture(GL_TEXTURE_2D, gltexture);
glErrorCheck();
glPixelStorei(GL_UNPACK_ROW_LENGTH, iwidth);
glErrorCheck();
glTexImage2D(GL_TEXTURE_2D,
/* mip-map level = */ 0, /* internal format = */ GL_RGB16_EXT,
width, height, /* border = */ 0, /* format = */ GL_BGRA,
iformat, buffer);
glErrorCheck();
}
bool OpenGL::lock(uint32_t *&data, unsigned &pitch) {
pitch = iwidth * ibpp;
return (data = buffer);
}
void OpenGL::clear() {
memset(buffer, 0, iwidth * iheight * ibpp);
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}
void OpenGL::refresh(bool smooth, unsigned inwidth, unsigned inheight, unsigned outwidth, unsigned outheight) {
while (glGetError() != GL_NO_ERROR); // clear possible error from who knows where
if(shader_support && (fragmentshader || vertexshader)) {
glUseProgram(glprogram);
GLint location;
float inputSize[2] = { (float)inwidth, (float)inheight };
location = glGetUniformLocation(glprogram, "rubyInputSize");
glUniform2fv(location, 1, inputSize);
float outputSize[2] = { (float)outwidth, (float)outheight };
location = glGetUniformLocation(glprogram, "rubyOutputSize");
glUniform2fv(location, 1, outputSize);
float textureSize[2] = { (float)iwidth, (float)iheight };
location = glGetUniformLocation(glprogram, "rubyTextureSize");
glUniform2fv(location, 1, textureSize);
}
glErrorCheck();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, smooth ? GL_LINEAR : GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, smooth ? GL_LINEAR : GL_NEAREST);
glErrorCheck();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, outwidth, 0, outheight, -1.0, 1.0);
glViewport(0, 0, outwidth, outheight);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glErrorCheck();
glPixelStorei(GL_UNPACK_ROW_LENGTH, buffer_surface->getSurface()->pitch / buffer_surface->getSurface()->format->BytesPerPixel);
glErrorCheck();
glTexSubImage2D(GL_TEXTURE_2D,
/* mip-map level = */ 0, /* x = */ 0, /* y = */ 0,
iwidth, iheight, GL_BGRA, iformat, buffer);
//OpenGL projection sets 0,0 as *bottom-left* of screen.
//therefore, below vertices flip image to support top-left source.
//texture range = x1:0.0, y1:0.0, x2:1.0, y2:1.0
//vertex range = x1:0, y1:0, x2:width, y2:height
double w = double(inwidth) / double(iwidth);
double h = double(inheight) / double(iheight);
int u = outwidth;
int v = outheight;
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0, 0); glVertex3i(0, v, 0);
glTexCoord2f(w, 0); glVertex3i(u, v, 0);
glTexCoord2f(0, h); glVertex3i(0, 0, 0);
glTexCoord2f(w, h); glVertex3i(u, 0, 0);
glEnd();
glErrorCheck();
glFlush();
glErrorCheck();
if(shader_support) {
glUseProgram(0);
}
}
void OpenGL::set_shader(const char *source_yaml_filename) {
if(!shader_support) return;
if(fragmentshader) {
glDetachShader(glprogram, fragmentshader);
glDeleteShader(fragmentshader);
fragmentshader = 0;
}
if(vertexshader) {
glDetachShader(glprogram, vertexshader);
glDeleteShader(vertexshader);
vertexshader = 0;
}
if(source_yaml_filename && strlen(source_yaml_filename)) {
std::ifstream fin(source_yaml_filename);
YAML::Parser parser(fin);
YAML::Node document;
parser.GetNextDocument(document);
bool is_glsl;
std::string s;
document["language"] >> s;
is_glsl = (s == "GLSL");
document["linear"] >> linear; // some shaders want texture linear interpolation and some don't
std::string fragment_source;
std::string vertex_source;
if (const YAML::Node *pFrag = document.FindValue("fragment")) *pFrag >> fragment_source;
if (const YAML::Node *pVert = document.FindValue("vertex")) *pVert >> vertex_source;
if(is_glsl) {
if(fragment_source != "") set_fragment_shader(fragment_source.c_str());
if(vertex_source != "") set_vertex_shader(vertex_source.c_str());
}
}
glLinkProgram(glprogram);
}
void OpenGL::set_fragment_shader(const char *source) {
fragmentshader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentshader, 1, &source, 0);
glCompileShader(fragmentshader);
glAttachShader(glprogram, fragmentshader);
}
void OpenGL::set_vertex_shader(const char *source) {
vertexshader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexshader, 1, &source, 0);
glCompileShader(vertexshader);
glAttachShader(glprogram, vertexshader);
}
void OpenGL::init(int w, int h) {
//disable unused features
glDisable(GL_ALPHA_TEST);
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glDisable(GL_POLYGON_SMOOTH);
glDisable(GL_STENCIL_TEST);
//enable useful and required features
glEnable(GL_DITHER);
glEnable(GL_TEXTURE_2D);
//bind shader functions
glCreateProgram = (PFNGLCREATEPROGRAMPROC)glGetProcAddress("glCreateProgram");
glUseProgram = (PFNGLUSEPROGRAMPROC)glGetProcAddress("glUseProgram");
glCreateShader = (PFNGLCREATESHADERPROC)glGetProcAddress("glCreateShader");
glDeleteShader = (PFNGLDELETESHADERPROC)glGetProcAddress("glDeleteShader");
glShaderSource = (PFNGLSHADERSOURCEPROC)glGetProcAddress("glShaderSource");
glCompileShader = (PFNGLCOMPILESHADERPROC)glGetProcAddress("glCompileShader");
glAttachShader = (PFNGLATTACHSHADERPROC)glGetProcAddress("glAttachShader");
glDetachShader = (PFNGLDETACHSHADERPROC)glGetProcAddress("glDetachShader");
glLinkProgram = (PFNGLLINKPROGRAMPROC)glGetProcAddress("glLinkProgram");
glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)glGetProcAddress("glGetUniformLocation");
glUniform1i = (PFNGLUNIFORM1IPROC)glGetProcAddress("glUniform1i");
glUniform2fv = (PFNGLUNIFORM2FVPROC)glGetProcAddress("glUniform2fv");
glUniform4fv = (PFNGLUNIFORM4FVPROC)glGetProcAddress("glUniform4fv");
glXGetCurrentDisplay = (void* (APIENTRYP)())glGetProcAddress("glXGetCurrentDisplay");
glXGetCurrentDrawable = (Uint32 (APIENTRYP)())glGetProcAddress("glXGetCurrentDrawable");
glXSwapIntervalEXT = (void (APIENTRYP)(void*, Uint32, int))glGetProcAddress("glXSwapIntervalEXT");
wglSwapIntervalEXT = (Uint32 (APIENTRYP)(int))glGetProcAddress("wglSwapIntervalEXT");
shader_support = glCreateProgram && glUseProgram && glCreateShader
&& glDeleteShader && glShaderSource && glCompileShader && glAttachShader
&& glDetachShader && glLinkProgram && glGetUniformLocation
&& glUniform1i && glUniform2fv && glUniform4fv;
if(shader_support) glprogram = glCreateProgram();
//create surface texture
resize(w, h);
}
void OpenGL::setVSync(bool sync)
{
const int interval = sync ? 1 : 0;
if (glXGetCurrentDisplay && glXGetCurrentDrawable && glXSwapIntervalEXT)
{
void *dpy = glXGetCurrentDisplay();
Uint32 drawable = glXGetCurrentDrawable();
if (drawable) {
glXSwapIntervalEXT(dpy, drawable, interval);
// Log(LOG_INFO) << "Made an attempt to set vsync via GLX.";
}
} else if (wglSwapIntervalEXT)
{
wglSwapIntervalEXT(interval);
// Log(LOG_INFO) << "Made an attempt to set vsync via WGL.";
}
}
void OpenGL::term() {
if(gltexture) {
glDeleteTextures(1, &gltexture);
gltexture = 0;
}
if(buffer) {
delete[] buffer;
buffer = 0;
iwidth = 0;
iheight = 0;
}
}
OpenGL::OpenGL() {
gltexture = 0;
glprogram = 0;
fragmentshader = 0;
linear = 0;
vertexshader = 0;
buffer = 0;
iwidth = 0;
iheight = 0;
ibpp = 32; // this didn't seem to be set anywhere before...
iformat = GL_UNSIGNED_INT_8_8_8_8_REV; // nor this
buffer_surface = 0;
}
}