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Final merge of Google Summer of Code 2008 work... Bring SDL to iPhone and iPod Touch by Holmes Futrell, mentored by Sam Lantinga
author Sam Lantinga <slouken@libsdl.org>
date Sat, 04 Oct 2008 06:46:59 +0000
parents
children 82e60908fab1
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2764:4868c0df2e83 2765:f55c87ae336b
1 #include <stdlib.h>
2 #include <stdio.h>
3 #include <string.h>
4 #include <math.h>
5
6 #include "common.h"
7
8 #ifdef __IPHONEOS__
9 #define HAVE_OPENGLES
10 #endif
11
12 #ifdef HAVE_OPENGLES
13
14 #include "SDL_opengles.h"
15
16 static CommonState *state;
17 static SDL_GLContext context;
18
19 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
20 static void
21 quit(int rc)
22 {
23 if (context) {
24 /* SDL_GL_MakeCurrent(0, NULL); *//* doesn't do anything */
25 SDL_GL_DeleteContext(context);
26 }
27 CommonQuit(state);
28 exit(rc);
29 }
30
31 static void
32 Render()
33 {
34 static GLubyte color[8][4] = { {255, 0, 0, 0},
35 {255, 0, 0, 255},
36 {0, 255, 0, 255},
37 {0, 255, 0, 255},
38 {0, 255, 0, 255},
39 {255, 255, 255, 255},
40 {255, 0, 255, 255},
41 {0, 0, 255, 255}
42 };
43 static GLfloat cube[8][3] = { {0.5, 0.5, -0.5},
44 {0.5f, -0.5f, -0.5f},
45 {-0.5f, -0.5f, -0.5f},
46 {-0.5f, 0.5f, -0.5f},
47 {-0.5f, 0.5f, 0.5f},
48 {0.5f, 0.5f, 0.5f},
49 {0.5f, -0.5f, 0.5f},
50 {-0.5f, -0.5f, 0.5f}
51 };
52 static GLubyte indices[36] = { 0, 3, 4,
53 4, 5, 0,
54 0, 5, 6,
55 6, 1, 0,
56 6, 7, 2,
57 2, 1, 6,
58 7, 4, 3,
59 3, 2, 7,
60 5, 4, 7,
61 7, 6, 5,
62 2, 3, 1,
63 3, 0, 1
64 };
65
66
67 /* Do our drawing, too. */
68 glClearColor(0.0, 0.0, 0.0, 1.0);
69 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
70
71 /* Draw the cube */
72 glColorPointer(4, GL_UNSIGNED_BYTE, 0, color);
73 glEnableClientState(GL_COLOR_ARRAY);
74 glVertexPointer(3, GL_FLOAT, 0, cube);
75 glEnableClientState(GL_VERTEX_ARRAY);
76 glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, indices);
77
78 glMatrixMode(GL_MODELVIEW);
79 glRotatef(5.0, 1.0, 1.0, 1.0);
80 }
81
82 int
83 main(int argc, char *argv[])
84 {
85 int fsaa, accel;
86 int value;
87 int i, done;
88 SDL_DisplayMode mode;
89 SDL_Event event;
90 Uint32 then, now, frames;
91
92 /* Initialize parameters */
93 fsaa = 0;
94 accel = 0;
95
96 /* Initialize test framework */
97 state = CommonCreateState(argv, SDL_INIT_VIDEO);
98 if (!state) {
99 return 1;
100 }
101 for (i = 1; i < argc;) {
102 int consumed;
103
104 consumed = CommonArg(state, i);
105 if (consumed == 0) {
106 if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {
107 ++fsaa;
108 consumed = 1;
109 } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {
110 ++accel;
111 consumed = 1;
112 } else {
113 consumed = -1;
114 }
115 }
116 if (consumed < 0) {
117 fprintf(stderr, "Usage: %s %s [--fsaa] [--accel]\n", argv[0],
118 CommonUsage(state));
119 quit(1);
120 }
121 i += consumed;
122 }
123
124 /* Set OpenGL parameters */
125 state->window_flags |= SDL_WINDOW_OPENGL;
126 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
127 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
128 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
129 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
130 if (fsaa) {
131 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
132 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa);
133 }
134 if (accel) {
135 SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
136 }
137 if (!CommonInit(state)) {
138 quit(2);
139 }
140
141 /* Create OpenGL context */
142 context = SDL_GL_CreateContext(state->windows[0]);
143 if (!context) {
144 fprintf(stderr, "SDL_GL_CreateContext(): %s\n", SDL_GetError());
145 quit(2);
146 }
147
148 if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
149 SDL_GL_SetSwapInterval(1);
150 } else {
151 SDL_GL_SetSwapInterval(0);
152 }
153
154 SDL_GetCurrentDisplayMode(&mode);
155 printf("Screen BPP: %d\n", SDL_BITSPERPIXEL(mode.format));
156 printf("\n");
157 printf("Vendor : %s\n", glGetString(GL_VENDOR));
158 printf("Renderer : %s\n", glGetString(GL_RENDERER));
159 printf("Version : %s\n", glGetString(GL_VERSION));
160 printf("Extensions : %s\n", glGetString(GL_EXTENSIONS));
161 printf("\n");
162
163 SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
164 printf("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);
165 SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
166 printf("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);
167 SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
168 printf("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);
169 SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
170 printf("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", 16, value);
171 if (fsaa) {
172 SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
173 printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
174 SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);
175 printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
176 value);
177 }
178 if (accel) {
179 SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
180 printf("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
181 }
182
183 /* Set rendering settings */
184 glMatrixMode(GL_PROJECTION);
185 glLoadIdentity();
186 glOrthof(-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);
187 glMatrixMode(GL_MODELVIEW);
188 glLoadIdentity();
189 glEnable(GL_DEPTH_TEST);
190 glDepthFunc(GL_LESS);
191 glShadeModel(GL_SMOOTH);
192
193 /* Main render loop */
194 frames = 0;
195 then = SDL_GetTicks();
196 done = 0;
197 while (!done) {
198 /* Check for events */
199 ++frames;
200 while (SDL_PollEvent(&event)) {
201 CommonEvent(state, &event, &done);
202 }
203 for (i = 0; i < state->num_windows; ++i) {
204 int w, h;
205 SDL_GL_MakeCurrent(state->windows[i], context);
206 SDL_GetWindowSize(state->windows[i], &w, &h);
207 glViewport(0, 0, w, h);
208 Render();
209 SDL_GL_SwapWindow(state->windows[i]);
210 }
211 }
212
213 /* Print out some timing information */
214 now = SDL_GetTicks();
215 if (now > then) {
216 printf("%2.2f frames per second\n",
217 ((double) frames * 1000) / (now - then));
218 }
219 quit(0);
220 return 0;
221 }
222
223 #else /* HAVE_OPENGLES */
224
225 int
226 main(int argc, char *argv[])
227 {
228 printf("No OpenGL ES support on this system\n");
229 return 1;
230 }
231
232 #endif /* HAVE_OPENGLES */