1 /*
2   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
3 
4   This software is provided 'as-is', without any express or implied
5   warranty.  In no event will the authors be held liable for any damages
6   arising from the use of this software.
7 
8   Permission is granted to anyone to use this software for any purpose,
9   including commercial applications, and to alter it and redistribute it
10   freely.
11 */
12 #include <stdlib.h>
13 #include <stdio.h>
14 #include <string.h>
15 #include <math.h>
16 
17 #include "SDL_test_common.h"
18 
19 #if defined(__IPHONEOS__) || defined(__ANDROID__)
20 #define HAVE_OPENGLES
21 #endif
22 
23 #ifdef HAVE_OPENGLES
24 
25 #include "SDL_opengles.h"
26 
27 static SDLTest_CommonState *state;
28 static SDL_GLContext *context = NULL;
29 static int depth = 16;
30 
31 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
32 static void
quit(int rc)33 quit(int rc)
34 {
35     int i;
36 
37     if (context != NULL) {
38         for (i = 0; i < state->num_windows; i++) {
39             if (context[i]) {
40                 SDL_GL_DeleteContext(context[i]);
41             }
42         }
43 
44         SDL_free(context);
45     }
46 
47     SDLTest_CommonQuit(state);
48     exit(rc);
49 }
50 
51 static void
Render()52 Render()
53 {
54     static GLubyte color[8][4] = { {255, 0, 0, 0},
55     {255, 0, 0, 255},
56     {0, 255, 0, 255},
57     {0, 255, 0, 255},
58     {0, 255, 0, 255},
59     {255, 255, 255, 255},
60     {255, 0, 255, 255},
61     {0, 0, 255, 255}
62     };
63     static GLfloat cube[8][3] = { {0.5, 0.5, -0.5},
64     {0.5f, -0.5f, -0.5f},
65     {-0.5f, -0.5f, -0.5f},
66     {-0.5f, 0.5f, -0.5f},
67     {-0.5f, 0.5f, 0.5f},
68     {0.5f, 0.5f, 0.5f},
69     {0.5f, -0.5f, 0.5f},
70     {-0.5f, -0.5f, 0.5f}
71     };
72     static GLubyte indices[36] = { 0, 3, 4,
73         4, 5, 0,
74         0, 5, 6,
75         6, 1, 0,
76         6, 7, 2,
77         2, 1, 6,
78         7, 4, 3,
79         3, 2, 7,
80         5, 4, 7,
81         7, 6, 5,
82         2, 3, 1,
83         3, 0, 1
84     };
85 
86 
87     /* Do our drawing, too. */
88     glClearColor(0.0, 0.0, 0.0, 1.0);
89     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
90 
91     /* Draw the cube */
92     glColorPointer(4, GL_UNSIGNED_BYTE, 0, color);
93     glEnableClientState(GL_COLOR_ARRAY);
94     glVertexPointer(3, GL_FLOAT, 0, cube);
95     glEnableClientState(GL_VERTEX_ARRAY);
96     glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, indices);
97 
98     glMatrixMode(GL_MODELVIEW);
99     glRotatef(5.0, 1.0, 1.0, 1.0);
100 }
101 
102 int
main(int argc,char * argv[])103 main(int argc, char *argv[])
104 {
105     int fsaa, accel;
106     int value;
107     int i, done;
108     SDL_DisplayMode mode;
109     SDL_Event event;
110     Uint32 then, now, frames;
111     int status;
112 
113     /* Enable standard application logging */
114     SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
115 
116     /* Initialize parameters */
117     fsaa = 0;
118     accel = 0;
119 
120     /* Initialize test framework */
121     state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
122     if (!state) {
123         return 1;
124     }
125     for (i = 1; i < argc;) {
126         int consumed;
127 
128         consumed = SDLTest_CommonArg(state, i);
129         if (consumed == 0) {
130             if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {
131                 ++fsaa;
132                 consumed = 1;
133             } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {
134                 ++accel;
135                 consumed = 1;
136             } else if (SDL_strcasecmp(argv[i], "--zdepth") == 0) {
137                 i++;
138                 if (!argv[i]) {
139                     consumed = -1;
140                 } else {
141                     depth = SDL_atoi(argv[i]);
142                     consumed = 1;
143                 }
144             } else {
145                 consumed = -1;
146             }
147         }
148         if (consumed < 0) {
149             static const char *options[] = { "[--fsaa]", "[--accel]", "[--zdepth %d]", NULL };
150             SDLTest_CommonLogUsage(state, argv[0], options);
151             quit(1);
152         }
153         i += consumed;
154     }
155 
156     /* Set OpenGL parameters */
157     state->window_flags |= SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_BORDERLESS;
158     state->gl_red_size = 5;
159     state->gl_green_size = 5;
160     state->gl_blue_size = 5;
161     state->gl_depth_size = depth;
162     state->gl_major_version = 1;
163     state->gl_minor_version = 1;
164     state->gl_profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
165     if (fsaa) {
166         state->gl_multisamplebuffers=1;
167         state->gl_multisamplesamples=fsaa;
168     }
169     if (accel) {
170         state->gl_accelerated=1;
171     }
172     if (!SDLTest_CommonInit(state)) {
173         quit(2);
174     }
175 
176     context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(context));
177     if (context == NULL) {
178         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!\n");
179         quit(2);
180     }
181 
182     /* Create OpenGL ES contexts */
183     for (i = 0; i < state->num_windows; i++) {
184         context[i] = SDL_GL_CreateContext(state->windows[i]);
185         if (!context[i]) {
186             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_GL_CreateContext(): %s\n", SDL_GetError());
187             quit(2);
188         }
189     }
190 
191     if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
192         SDL_GL_SetSwapInterval(1);
193     } else {
194         SDL_GL_SetSwapInterval(0);
195     }
196 
197     SDL_GetCurrentDisplayMode(0, &mode);
198     SDL_Log("Screen bpp: %d\n", SDL_BITSPERPIXEL(mode.format));
199     SDL_Log("\n");
200     SDL_Log("Vendor     : %s\n", glGetString(GL_VENDOR));
201     SDL_Log("Renderer   : %s\n", glGetString(GL_RENDERER));
202     SDL_Log("Version    : %s\n", glGetString(GL_VERSION));
203     SDL_Log("Extensions : %s\n", glGetString(GL_EXTENSIONS));
204     SDL_Log("\n");
205 
206     status = SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
207     if (!status) {
208         SDL_Log("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);
209     } else {
210         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_RED_SIZE: %s\n",
211                 SDL_GetError());
212     }
213     status = SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
214     if (!status) {
215         SDL_Log("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);
216     } else {
217         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_GREEN_SIZE: %s\n",
218                 SDL_GetError());
219     }
220     status = SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
221     if (!status) {
222         SDL_Log("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);
223     } else {
224         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_BLUE_SIZE: %s\n",
225                 SDL_GetError());
226     }
227     status = SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
228     if (!status) {
229         SDL_Log("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", depth, value);
230     } else {
231         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_DEPTH_SIZE: %s\n",
232                 SDL_GetError());
233     }
234     if (fsaa) {
235         status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
236         if (!status) {
237             SDL_Log("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
238         } else {
239             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_MULTISAMPLEBUFFERS: %s\n",
240                     SDL_GetError());
241         }
242         status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);
243         if (!status) {
244             SDL_Log("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
245                    value);
246         } else {
247             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_MULTISAMPLESAMPLES: %s\n",
248                     SDL_GetError());
249         }
250     }
251     if (accel) {
252         status = SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
253         if (!status) {
254             SDL_Log("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
255         } else {
256             SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to get SDL_GL_ACCELERATED_VISUAL: %s\n",
257                     SDL_GetError());
258         }
259     }
260 
261     /* Set rendering settings for each context */
262     for (i = 0; i < state->num_windows; ++i) {
263         float aspectAdjust;
264 
265         status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
266         if (status) {
267             SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
268 
269             /* Continue for next window */
270             continue;
271         }
272 
273         aspectAdjust = (4.0f / 3.0f) / ((float)state->window_w / state->window_h);
274         glViewport(0, 0, state->window_w, state->window_h);
275         glMatrixMode(GL_PROJECTION);
276         glLoadIdentity();
277         glOrthof(-2.0, 2.0, -2.0 * aspectAdjust, 2.0 * aspectAdjust, -20.0, 20.0);
278         glMatrixMode(GL_MODELVIEW);
279         glLoadIdentity();
280         glEnable(GL_DEPTH_TEST);
281         glDepthFunc(GL_LESS);
282         glShadeModel(GL_SMOOTH);
283     }
284 
285     /* Main render loop */
286     frames = 0;
287     then = SDL_GetTicks();
288     done = 0;
289     while (!done) {
290         /* Check for events */
291         ++frames;
292         while (SDL_PollEvent(&event)) {
293             switch (event.type) {
294             case SDL_WINDOWEVENT:
295                 switch (event.window.event) {
296                     case SDL_WINDOWEVENT_RESIZED:
297                         for (i = 0; i < state->num_windows; ++i) {
298                             if (event.window.windowID == SDL_GetWindowID(state->windows[i])) {
299                                 status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
300                                 if (status) {
301                                     SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
302                                     break;
303                                 }
304                                 /* Change view port to the new window dimensions */
305                                 glViewport(0, 0, event.window.data1, event.window.data2);
306                                 /* Update window content */
307                                 Render();
308                                 SDL_GL_SwapWindow(state->windows[i]);
309                                 break;
310                             }
311                         }
312                         break;
313                 }
314             }
315             SDLTest_CommonEvent(state, &event, &done);
316         }
317         for (i = 0; i < state->num_windows; ++i) {
318             if (state->windows[i] == NULL)
319                 continue;
320             status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
321             if (status) {
322                 SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
323 
324                 /* Continue for next window */
325                 continue;
326             }
327             Render();
328             SDL_GL_SwapWindow(state->windows[i]);
329         }
330     }
331 
332     /* Print out some timing information */
333     now = SDL_GetTicks();
334     if (now > then) {
335         SDL_Log("%2.2f frames per second\n",
336                ((double) frames * 1000) / (now - then));
337     }
338 #if !defined(__ANDROID__)
339     quit(0);
340 #endif
341     return 0;
342 }
343 
344 #else /* HAVE_OPENGLES */
345 
346 int
main(int argc,char * argv[])347 main(int argc, char *argv[])
348 {
349     SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "No OpenGL ES support on this system\n");
350     return 1;
351 }
352 
353 #endif /* HAVE_OPENGLES */
354 
355 /* vi: set ts=4 sw=4 expandtab: */
356