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comparison test/testgles.c @ 2430:166821fa1591 gsoc2008_iphone

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A version of testgl2 written using OpenGL ES calls. Necessary because there's no glBegin/glEnd, etc.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 00:54:21 +0000
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2429:2c55b72ba46e 2430:166821fa1591
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 /* Do our drawing, too. */
67 glClearColor(0.0, 0.0, 0.0, 1.0);
68 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
69
70 /* Draw the cube */
71 glColorPointer(4, GL_UNSIGNED_BYTE, 0, color);
72 glEnableClientState(GL_COLOR_ARRAY);
73 glVertexPointer(3, GL_FLOAT, 0, cube);
74 glEnableClientState(GL_VERTEX_ARRAY);
75 glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, indices);
76
77 glMatrixMode(GL_MODELVIEW);
78 glRotatef(5.0, 1.0, 1.0, 1.0);
79 }
80
81 int
82 main(int argc, char *argv[])
83 {
84 int fsaa, accel;
85 int value;
86 int i, done;
87 SDL_DisplayMode mode;
88 SDL_Event event;
89 Uint32 then, now, frames;
90
91 /* Initialize parameters */
92 fsaa = 0;
93 accel = 0;
94
95 /* Initialize test framework */
96 state = CommonCreateState(argv, SDL_INIT_VIDEO);
97 if (!state) {
98 return 1;
99 }
100 for (i = 1; i < argc;) {
101 int consumed;
102
103 consumed = CommonArg(state, i);
104 if (consumed == 0) {
105 if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {
106 ++fsaa;
107 consumed = 1;
108 } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {
109 ++accel;
110 consumed = 1;
111 } else {
112 consumed = -1;
113 }
114 }
115 if (consumed < 0) {
116 fprintf(stderr, "Usage: %s %s [--fsaa] [--accel]\n", argv[0],
117 CommonUsage(state));
118 quit(1);
119 }
120 i += consumed;
121 }
122
123 /* Set OpenGL parameters */
124 state->window_flags |= SDL_WINDOW_OPENGL;
125 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
126 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
127 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
128 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
129 if (fsaa) {
130 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
131 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa);
132 }
133 if (accel) {
134 SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
135 }
136 if (!CommonInit(state)) {
137 quit(2);
138 }
139
140 /* Create OpenGL context */
141 context = SDL_GL_CreateContext(state->windows[0]);
142 if (!context) {
143 fprintf(stderr, "SDL_GL_CreateContext(): %s\n", SDL_GetError());
144 quit(2);
145 }
146
147 if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
148 SDL_GL_SetSwapInterval(1);
149 } else {
150 SDL_GL_SetSwapInterval(0);
151 }
152
153 SDL_GetCurrentDisplayMode(&mode);
154 printf("Screen BPP: %d\n", SDL_BITSPERPIXEL(mode.format));
155 printf("\n");
156 printf("Vendor : %s\n", glGetString(GL_VENDOR));
157 printf("Renderer : %s\n", glGetString(GL_RENDERER));
158 printf("Version : %s\n", glGetString(GL_VERSION));
159 printf("Extensions : %s\n", glGetString(GL_EXTENSIONS));
160 printf("\n");
161
162 SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
163 printf("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);
164 SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
165 printf("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);
166 SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
167 printf("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);
168 SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
169 printf("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", 16, value);
170 if (fsaa) {
171 SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
172 printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
173 SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);
174 printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
175 value);
176 }
177 if (accel) {
178 SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
179 printf("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
180 }
181
182 /* Set rendering settings */
183 glMatrixMode(GL_PROJECTION);
184 glLoadIdentity();
185 glOrthof(-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);
186 glMatrixMode(GL_MODELVIEW);
187 glLoadIdentity();
188 glEnable(GL_DEPTH_TEST);
189 glDepthFunc(GL_LESS);
190 glShadeModel(GL_SMOOTH);
191
192 /* Main render loop */
193 frames = 0;
194 then = SDL_GetTicks();
195 done = 0;
196 while (!done) {
197 /* Check for events */
198 ++frames;
199 while (SDL_PollEvent(&event)) {
200 CommonEvent(state, &event, &done);
201 }
202 for (i = 0; i < state->num_windows; ++i) {
203 int w, h;
204 SDL_GL_MakeCurrent(state->windows[i], context);
205 SDL_GetWindowSize(state->windows[i], &w, &h);
206 glViewport(0, 0, w, h);
207 Render();
208 SDL_GL_SwapWindow(state->windows[i]);
209 }
210 }
211
212 /* Print out some timing information */
213 now = SDL_GetTicks();
214 if (now > then) {
215 printf("%2.2f frames per second\n",
216 ((double) frames * 1000) / (now - then));
217 }
218 quit(0);
219 return 0;
220 }
221
222 #else /* HAVE_OPENGLES */
223
224 int
225 main(int argc, char *argv[])
226 {
227 printf("No OpenGL ES support on this system\n");
228 return 1;
229 }
230
231 #endif /* HAVE_OPENGLES */