cvsroot/libgender/test.C

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

#include "SDL.h"

#include "SDL_opengl.h"

/* Undefine this if you want a flat cube instead of a rainbow cube */
#define SHADED_CUBE

/* Define this to be the name of the logo image to use with -logo */
#define LOGO_FILE       "icon.bmp"

static SDL_Surface *global_image = NULL;
static GLuint global_texture = 0;

#include "entity.h"

/**********************************************************************/

void
HotKey_ToggleFullScreen (void)
{
  SDL_Surface *screen;

  screen = SDL_GetVideoSurface ();
  if (SDL_WM_ToggleFullScreen (screen))
    {
      printf ("Toggled fullscreen mode - now %s\n",
              (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");
    }
  else
    {
      printf ("Unable to toggle fullscreen mode\n");
    }
}

void
HotKey_ToggleGrab (void)
{
  SDL_GrabMode mode;

  printf ("Ctrl-G: toggling input grab!\n");
  mode = SDL_WM_GrabInput (SDL_GRAB_QUERY);
  if (mode == SDL_GRAB_ON)
    {
      printf ("Grab was on\n");
    }
  else
    {
      printf ("Grab was off\n");
    }

  mode = SDL_WM_GrabInput (mode ? SDL_GRAB_OFF : SDL_GRAB_ON);
  if (mode == SDL_GRAB_ON)
    {
      printf ("Grab is now on\n");
    }
  else
    {
      printf ("Grab is now off\n");
    }
}

void
HotKey_Iconify (void)
{
  printf ("Ctrl-Z: iconifying window!\n");
  SDL_WM_IconifyWindow ();
}

int
HandleEvent (SDL_Event * event)
{
  int done;

  done = 0;
  switch (event->type)
    {
    case SDL_ACTIVEEVENT:
      /* See what happened */
      printf ("app %s ", event->active.gain ? "gained" : "lost");
      if (event->active.state & SDL_APPACTIVE)
        {
          printf ("active ");
        }
      else if (event->active.state & SDL_APPMOUSEFOCUS)
        {
          printf ("mouse ");
        }
      else if (event->active.state & SDL_APPINPUTFOCUS)
        {
          printf ("input ");
        }

      printf ("focus\n");
      break;

    case SDL_KEYDOWN:
      if (event->key.keysym.sym == SDLK_ESCAPE)
        {
          done = 1;
        }

      if ((event->key.keysym.sym == SDLK_g) &&
          (event->key.keysym.mod & KMOD_CTRL))
        {
          HotKey_ToggleGrab ();
        }

      if ((event->key.keysym.sym == SDLK_z) &&
          (event->key.keysym.mod & KMOD_CTRL))
        {
          HotKey_Iconify ();
        }

      if ((event->key.keysym.sym == SDLK_RETURN) &&
          (event->key.keysym.mod & KMOD_ALT))
        {
          HotKey_ToggleFullScreen ();
        }

      printf ("key '%s' pressed\n", SDL_GetKeyName (event->key.keysym.sym));
      break;

    case SDL_QUIT:
      done = 1;
      break;
    }

  return (done);
}

void
SDL_GL_Enter2DMode ()
{
  SDL_Surface *screen = SDL_GetVideoSurface ();

  /* Note, there may be other things you need to change,
     depending on how you have your OpenGL state set up.
   */
  glPushAttrib (GL_ENABLE_BIT);
  glDisable (GL_DEPTH_TEST);
  glDisable (GL_CULL_FACE);
  glEnable (GL_TEXTURE_2D);

  /* This allows alpha blending of 2D textures with the scene */
  glEnable (GL_BLEND);
  glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

  glViewport (0, 0, screen->w, screen->h);

  glMatrixMode (GL_PROJECTION);
  glPushMatrix ();
  glLoadIdentity ();

  glOrtho (0.0, (GLdouble) screen->w, (GLdouble) screen->h, 0.0, 0.0, 1.0);

  glMatrixMode (GL_MODELVIEW);
  glPushMatrix ();
  glLoadIdentity ();

  glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
}

void
SDL_GL_Leave2DMode ()
{
  glMatrixMode (GL_MODELVIEW);
  glPopMatrix ();

  glMatrixMode (GL_PROJECTION);
  glPopMatrix ();

  glPopAttrib ();
}

/* Quick utility function for texture creation */
static int
power_of_two (int input)
{
  int value = 1;

  while (value < input)
    {
      value <<= 1;
    }
  return value;
}

GLuint
SDL_GL_LoadTexture (SDL_Surface * surface, GLfloat * texcoord)
{
  GLuint texture;
  int w, h;
  SDL_Surface *image;
  SDL_Rect area;
  Uint32 saved_flags;
  Uint8 saved_alpha;

  /* Use the surface width and height expanded to powers of 2 */
  w = power_of_two (surface->w);
  h = power_of_two (surface->h);
  texcoord[0] = 0.0f;           /* Min X */
  texcoord[1] = 0.0f;           /* Min Y */
  texcoord[2] = (GLfloat) surface->w / w;       /* Max X */
  texcoord[3] = (GLfloat) surface->h / h;       /* Max Y */

  image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN     /* OpenGL RGBA masks */
                                0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
#else
                                0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
#endif
    );
  if (image == NULL)
    {
      return 0;
    }

  /* Save the alpha blending attributes */
  saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
  saved_alpha = surface->format->alpha;
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    {
      SDL_SetAlpha (surface, 0, 0);
    }

  /* Copy the surface into the GL texture image */
  area.x = 0;
  area.y = 0;
  area.w = surface->w;
  area.h = surface->h;
  SDL_BlitSurface (surface, &area, image, &area);

  /* Restore the alpha blending attributes */
  if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
    {
      SDL_SetAlpha (surface, saved_flags, saved_alpha);
    }

  /* Create an OpenGL texture for the image */
  glGenTextures (1, &texture);
  glBindTexture (GL_TEXTURE_2D, texture);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexImage2D (GL_TEXTURE_2D,
                0,
                GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
  SDL_FreeSurface (image);      /* No longer needed */

  return texture;
}


void
DrawLogoTexture (void)
{
  static GLfloat texMinX, texMinY;
  static GLfloat texMaxX, texMaxY;
  static int x = 0;
  static int y = 0;
  static int w, h;
  static int delta_x = 1;
  static int delta_y = 1;
  static Uint32 last_moved = 0;

  SDL_Surface *screen = SDL_GetVideoSurface ();

  if (!global_texture)
    {
      SDL_Surface *image;
      GLfloat texcoord[4];

      /* Load the image (could use SDL_image library here) */
      image = SDL_LoadBMP (LOGO_FILE);
      if (image == NULL)
        {
          return;
        }
      w = image->w;
      h = image->h;

      /* Convert the image into an OpenGL texture */
      global_texture = SDL_GL_LoadTexture (image, texcoord);

      /* Make texture coordinates easy to understand */
      texMinX = texcoord[0];
      texMinY = texcoord[1];
      texMaxX = texcoord[2];
      texMaxY = texcoord[3];

      /* We don't need the original image anymore */
      SDL_FreeSurface (image);

      /* Make sure that the texture conversion is okay */
      if (!global_texture)
        {
          return;
        }
    }

  /* Move the image around */
  x += delta_x;
  if (x < 0)
    {
      x = 0;
      delta_x = -delta_x;
    }
  else if ((x + w) > screen->w)
    {
      x = screen->w - w;
      delta_x = -delta_x;
    }
  y += delta_y;
  if (y < 0)
    {
      y = 0;
      delta_y = -delta_y;
    }
  else if ((y + h) > screen->h)
    {
      y = screen->h - h;
      delta_y = -delta_y;
    }

  /* Show the image on the screen */
  SDL_GL_Enter2DMode ();
  glBindTexture (GL_TEXTURE_2D, global_texture);
  glBegin (GL_TRIANGLE_STRIP);
  glTexCoord2f (texMinX, texMinY);
  glVertex2i (x, y);
  glTexCoord2f (texMaxX, texMinY);
  glVertex2i (x + w, y);
  glTexCoord2f (texMinX, texMaxY);
  glVertex2i (x, y + h);
  glTexCoord2f (texMaxX, texMaxY);
  glVertex2i (x + w, y + h);
  glEnd ();
  SDL_GL_Leave2DMode ();
}

int
RunGLTest (int argc, char *argv[],
           int logo, int slowly, int bpp, float gamma, int noframe, int fsaa)
{
  int i;
  int rgb_size[3];
  int w = 640;
  int h = 480;
  int done = 0;
  int frames;
  Uint32 start_time, this_time;
  Uint32 video_flags;
  int value;

  if (SDL_Init (SDL_INIT_VIDEO) < 0)
    {
      fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
      exit (1);
    }

  /* See if we should detect the display depth */
  if (bpp == 0)
    {
      if (SDL_GetVideoInfo ()->vfmt->BitsPerPixel <= 8)
        {
          bpp = 8;
        }
      else
        {
          bpp = 16;             /* More doesn't seem to work */
        }
    }

  video_flags = SDL_OPENGL;

  for (i = 1; argv[i]; ++i)
    {
      if (strcmp (argv[1], "-fullscreen") == 0)
        {
          video_flags |= SDL_FULLSCREEN;
        }
    }

  if (noframe)
    {
      video_flags |= SDL_NOFRAME;
    }

  /* Initialize the display */
  switch (bpp)
    {
    case 8:
      rgb_size[0] = 3;
      rgb_size[1] = 3;
      rgb_size[2] = 2;
      break;
    case 15:
    case 16:
      rgb_size[0] = 5;
      rgb_size[1] = 5;
      rgb_size[2] = 5;
      break;
    default:
      rgb_size[0] = 8;
      rgb_size[1] = 8;
      rgb_size[2] = 8;
      break;
    }
  SDL_GL_SetAttribute (SDL_GL_RED_SIZE, rgb_size[0]);
  SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, rgb_size[1]);
  SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, rgb_size[2]);
  SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, 16);
  SDL_GL_SetAttribute (SDL_GL_DOUBLEBUFFER, 1);
  if (fsaa)
    {
      SDL_GL_SetAttribute (SDL_GL_MULTISAMPLEBUFFERS, 1);
      SDL_GL_SetAttribute (SDL_GL_MULTISAMPLESAMPLES, fsaa);
    }
  if (SDL_SetVideoMode (w, h, bpp, video_flags) == NULL)
    {
      fprintf (stderr, "Couldn't set GL mode: %s\n", SDL_GetError ());
      SDL_Quit ();
      exit (1);
    }

  printf ("Screen BPP: %d\n", SDL_GetVideoSurface ()->format->BitsPerPixel);
  printf ("\n");
  printf ("Vendor     : %s\n", glGetString (GL_VENDOR));
  printf ("Renderer   : %s\n", glGetString (GL_RENDERER));
  printf ("Version    : %s\n", glGetString (GL_VERSION));
  printf ("Extensions : %s\n", glGetString (GL_EXTENSIONS));
  printf ("\n");

  SDL_GL_GetAttribute (SDL_GL_RED_SIZE, &value);
  printf ("SDL_GL_RED_SIZE: requested %d, got %d\n", rgb_size[0], value);
  SDL_GL_GetAttribute (SDL_GL_GREEN_SIZE, &value);
  printf ("SDL_GL_GREEN_SIZE: requested %d, got %d\n", rgb_size[1], value);
  SDL_GL_GetAttribute (SDL_GL_BLUE_SIZE, &value);
  printf ("SDL_GL_BLUE_SIZE: requested %d, got %d\n", rgb_size[2], value);
  SDL_GL_GetAttribute (SDL_GL_DEPTH_SIZE, &value);
  printf ("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", bpp, value);
  SDL_GL_GetAttribute (SDL_GL_DOUBLEBUFFER, &value);
  printf ("SDL_GL_DOUBLEBUFFER: requested 1, got %d\n", value);
  if (fsaa)
    {
      SDL_GL_GetAttribute (SDL_GL_MULTISAMPLEBUFFERS, &value);
      printf ("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
      SDL_GL_GetAttribute (SDL_GL_MULTISAMPLESAMPLES, &value);
      printf ("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
              value);
    }

  /* Set the window manager title bar */
  SDL_WM_SetCaption ("SDL GL test", "testgl");

  /* Set the gamma for the window */
  if (gamma != 0.0)
    {
      SDL_SetGamma (gamma, gamma, gamma);
    }

  glViewport (0, 0, w, h);
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();

  glOrtho (-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);

  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity ();

  glEnable (GL_DEPTH_TEST);

  glDepthFunc (GL_LESS);

  glShadeModel (GL_SMOOTH);

  /* Loop until done. */
  start_time = SDL_GetTicks ();
  frames = 0;
  while (!done)
    {
      GLenum gl_error;
      char *sdl_error;
      SDL_Event event;

      /* Do our drawing, too. */
      glClearColor (0.0, 0.0, 0.0, 1.0);
      glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

      glBegin (GL_QUADS);

      glEnd ();

      SDL_GL_SwapBuffers ();

      /* Check for error conditions. */
      gl_error = glGetError ();

      if (gl_error != GL_NO_ERROR)
        {
          fprintf (stderr, "testgl: OpenGL error: %d\n", gl_error);
        }

      sdl_error = SDL_GetError ();

      if (sdl_error[0] != '\0')
        {
          fprintf (stderr, "testgl: SDL error '%s'\n", sdl_error);
          SDL_ClearError ();
        }

      /* Allow the user to see what's happening */
      SDL_Delay (20);

      /* Check if there's a pending event. */
      while (SDL_PollEvent (&event))
        {
          done = HandleEvent (&event);
        }
      ++frames;
    }

  /* Print out the frames per second */
  this_time = SDL_GetTicks ();
  if (this_time != start_time)
    {
      printf ("%2.2f FPS\n",
              ((float) frames / (this_time - start_time)) * 1000.0);
    }

  if (global_image)
    {
      SDL_FreeSurface (global_image);
      global_image = NULL;
    }
  if (global_texture)
    {
      glDeleteTextures (1, &global_texture);
      global_texture = 0;
    }

  /* Destroy our GL context, etc. */
  SDL_Quit ();
  return (0);
}

int
main (int argc, char *argv[])
{
  int i, logo;
  int numtests;
  int bpp = 0;
  int slowly;
  float gamma = 0.0;
  int noframe = 0;
  int fsaa = 0;

  logo = 0;
  slowly = 0;
  numtests = 1;
  for (i = 1; argv[i]; ++i)
    {
      if (strcmp (argv[i], "-twice") == 0)
        {
          ++numtests;
        }
      if (strcmp (argv[i], "-slow") == 0)
        {
          slowly = 1;
        }
      if (strcmp (argv[i], "-bpp") == 0)
        {
          bpp = atoi (argv[++i]);
        }
      if (strcmp (argv[i], "-gamma") == 0)
        {
          gamma = (float) atof (argv[++i]);
        }
      if (strcmp (argv[i], "-noframe") == 0)
        {
          noframe = 1;
        }
      if (strcmp (argv[i], "-fsaa") == 0)
        {
          ++fsaa;
        }
      if (strncmp (argv[i], "-h", 2) == 0)
        {
          printf
            ("Usage: %s [-twice] [-logo] [-slow] [-bpp n] [-gamma n] [-noframe] [-fsaa]\n",
             argv[0]);
          exit (0);
        }
    }
  for (i = 0; i < numtests; ++i)
    {
      RunGLTest (argc, argv, logo, slowly, bpp, gamma, noframe, fsaa);
    }
  return 0;
}
Revision:	1.2
Committed:	Sat Oct 2 15:54:43 2004 UTC (22 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+5 -124 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <stdlib.h>
2			#include <stdio.h>
3			#include <string.h>
4			#include <math.h>
5
6			#include "SDL.h"
7
8			#include "SDL_opengl.h"
9
10			/* Undefine this if you want a flat cube instead of a rainbow cube */
11			#define SHADED_CUBE
12
13			/* Define this to be the name of the logo image to use with -logo */
14			#define LOGO_FILE "icon.bmp"
15
16			static SDL_Surface *global_image = NULL;
17			static GLuint global_texture = 0;
18
19	root	1.2	#include "entity.h"
20
21	root	1.1	/**********************************************************************/
22
23			void
24			HotKey_ToggleFullScreen (void)
25			{
26			SDL_Surface *screen;
27
28			screen = SDL_GetVideoSurface ();
29			if (SDL_WM_ToggleFullScreen (screen))
30			{
31			printf ("Toggled fullscreen mode - now %s\n",
32			(screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");
33			}
34			else
35			{
36			printf ("Unable to toggle fullscreen mode\n");
37			}
38			}
39
40			void
41			HotKey_ToggleGrab (void)
42			{
43			SDL_GrabMode mode;
44
45			printf ("Ctrl-G: toggling input grab!\n");
46			mode = SDL_WM_GrabInput (SDL_GRAB_QUERY);
47			if (mode == SDL_GRAB_ON)
48			{
49			printf ("Grab was on\n");
50			}
51			else
52			{
53			printf ("Grab was off\n");
54			}
55
56			mode = SDL_WM_GrabInput (mode ? SDL_GRAB_OFF : SDL_GRAB_ON);
57			if (mode == SDL_GRAB_ON)
58			{
59			printf ("Grab is now on\n");
60			}
61			else
62			{
63			printf ("Grab is now off\n");
64			}
65			}
66
67			void
68			HotKey_Iconify (void)
69			{
70			printf ("Ctrl-Z: iconifying window!\n");
71			SDL_WM_IconifyWindow ();
72			}
73
74			int
75			HandleEvent (SDL_Event * event)
76			{
77			int done;
78
79			done = 0;
80			switch (event->type)
81			{
82			case SDL_ACTIVEEVENT:
83			/* See what happened */
84			printf ("app %s ", event->active.gain ? "gained" : "lost");
85			if (event->active.state & SDL_APPACTIVE)
86			{
87			printf ("active ");
88			}
89			else if (event->active.state & SDL_APPMOUSEFOCUS)
90			{
91			printf ("mouse ");
92			}
93			else if (event->active.state & SDL_APPINPUTFOCUS)
94			{
95			printf ("input ");
96			}
97
98			printf ("focus\n");
99			break;
100
101			case SDL_KEYDOWN:
102			if (event->key.keysym.sym == SDLK_ESCAPE)
103			{
104			done = 1;
105			}
106
107			if ((event->key.keysym.sym == SDLK_g) &&
108			(event->key.keysym.mod & KMOD_CTRL))
109			{
110			HotKey_ToggleGrab ();
111			}
112
113			if ((event->key.keysym.sym == SDLK_z) &&
114			(event->key.keysym.mod & KMOD_CTRL))
115			{
116			HotKey_Iconify ();
117			}
118
119			if ((event->key.keysym.sym == SDLK_RETURN) &&
120			(event->key.keysym.mod & KMOD_ALT))
121			{
122			HotKey_ToggleFullScreen ();
123			}
124
125			printf ("key '%s' pressed\n", SDL_GetKeyName (event->key.keysym.sym));
126			break;
127
128			case SDL_QUIT:
129			done = 1;
130			break;
131			}
132
133			return (done);
134			}
135
136			void
137			SDL_GL_Enter2DMode ()
138			{
139			SDL_Surface *screen = SDL_GetVideoSurface ();
140
141			/* Note, there may be other things you need to change,
142			depending on how you have your OpenGL state set up.
143			*/
144			glPushAttrib (GL_ENABLE_BIT);
145			glDisable (GL_DEPTH_TEST);
146			glDisable (GL_CULL_FACE);
147			glEnable (GL_TEXTURE_2D);
148
149			/* This allows alpha blending of 2D textures with the scene */
150			glEnable (GL_BLEND);
151			glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
152
153			glViewport (0, 0, screen->w, screen->h);
154
155			glMatrixMode (GL_PROJECTION);
156			glPushMatrix ();
157			glLoadIdentity ();
158
159			glOrtho (0.0, (GLdouble) screen->w, (GLdouble) screen->h, 0.0, 0.0, 1.0);
160
161			glMatrixMode (GL_MODELVIEW);
162			glPushMatrix ();
163			glLoadIdentity ();
164
165			glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
166			}
167
168			void
169			SDL_GL_Leave2DMode ()
170			{
171			glMatrixMode (GL_MODELVIEW);
172			glPopMatrix ();
173
174			glMatrixMode (GL_PROJECTION);
175			glPopMatrix ();
176
177			glPopAttrib ();
178			}
179
180			/* Quick utility function for texture creation */
181			static int
182			power_of_two (int input)
183			{
184			int value = 1;
185
186			while (value < input)
187			{
188			value <<= 1;
189			}
190			return value;
191			}
192
193			GLuint
194			SDL_GL_LoadTexture (SDL_Surface * surface, GLfloat * texcoord)
195			{
196			GLuint texture;
197			int w, h;
198			SDL_Surface *image;
199			SDL_Rect area;
200			Uint32 saved_flags;
201			Uint8 saved_alpha;
202
203			/* Use the surface width and height expanded to powers of 2 */
204			w = power_of_two (surface->w);
205			h = power_of_two (surface->h);
206			texcoord[0] = 0.0f; /* Min X */
207			texcoord[1] = 0.0f; /* Min Y */
208			texcoord[2] = (GLfloat) surface->w / w; /* Max X */
209			texcoord[3] = (GLfloat) surface->h / h; /* Max Y */
210
211			image = SDL_CreateRGBSurface (SDL_SWSURFACE, w, h, 32,
212			#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
213			0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
214			#else
215			0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF
216			#endif
217			);
218			if (image == NULL)
219			{
220			return 0;
221			}
222
223			/* Save the alpha blending attributes */
224			saved_flags = surface->flags & (SDL_SRCALPHA \| SDL_RLEACCELOK);
225			saved_alpha = surface->format->alpha;
226			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
227			{
228			SDL_SetAlpha (surface, 0, 0);
229			}
230
231			/* Copy the surface into the GL texture image */
232			area.x = 0;
233			area.y = 0;
234			area.w = surface->w;
235			area.h = surface->h;
236			SDL_BlitSurface (surface, &area, image, &area);
237
238			/* Restore the alpha blending attributes */
239			if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
240			{
241			SDL_SetAlpha (surface, saved_flags, saved_alpha);
242			}
243
244			/* Create an OpenGL texture for the image */
245			glGenTextures (1, &texture);
246			glBindTexture (GL_TEXTURE_2D, texture);
247			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
248			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
249			glTexImage2D (GL_TEXTURE_2D,
250			0,
251			GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
252			SDL_FreeSurface (image); /* No longer needed */
253
254			return texture;
255			}
256
257
258			void
259			DrawLogoTexture (void)
260			{
261			static GLfloat texMinX, texMinY;
262			static GLfloat texMaxX, texMaxY;
263			static int x = 0;
264			static int y = 0;
265			static int w, h;
266			static int delta_x = 1;
267			static int delta_y = 1;
268			static Uint32 last_moved = 0;
269
270			SDL_Surface *screen = SDL_GetVideoSurface ();
271
272			if (!global_texture)
273			{
274			SDL_Surface *image;
275			GLfloat texcoord[4];
276
277			/* Load the image (could use SDL_image library here) */
278			image = SDL_LoadBMP (LOGO_FILE);
279			if (image == NULL)
280			{
281			return;
282			}
283			w = image->w;
284			h = image->h;
285
286			/* Convert the image into an OpenGL texture */
287			global_texture = SDL_GL_LoadTexture (image, texcoord);
288
289			/* Make texture coordinates easy to understand */
290			texMinX = texcoord[0];
291			texMinY = texcoord[1];
292			texMaxX = texcoord[2];
293			texMaxY = texcoord[3];
294
295			/* We don't need the original image anymore */
296			SDL_FreeSurface (image);
297
298			/* Make sure that the texture conversion is okay */
299			if (!global_texture)
300			{
301			return;
302			}
303			}
304
305			/* Move the image around */
306			x += delta_x;
307			if (x < 0)
308			{
309			x = 0;
310			delta_x = -delta_x;
311			}
312			else if ((x + w) > screen->w)
313			{
314			x = screen->w - w;
315			delta_x = -delta_x;
316			}
317			y += delta_y;
318			if (y < 0)
319			{
320			y = 0;
321			delta_y = -delta_y;
322			}
323			else if ((y + h) > screen->h)
324			{
325			y = screen->h - h;
326			delta_y = -delta_y;
327			}
328
329			/* Show the image on the screen */
330			SDL_GL_Enter2DMode ();
331			glBindTexture (GL_TEXTURE_2D, global_texture);
332			glBegin (GL_TRIANGLE_STRIP);
333			glTexCoord2f (texMinX, texMinY);
334			glVertex2i (x, y);
335			glTexCoord2f (texMaxX, texMinY);
336			glVertex2i (x + w, y);
337			glTexCoord2f (texMinX, texMaxY);
338			glVertex2i (x, y + h);
339			glTexCoord2f (texMaxX, texMaxY);
340			glVertex2i (x + w, y + h);
341			glEnd ();
342			SDL_GL_Leave2DMode ();
343			}
344
345			int
346			RunGLTest (int argc, char *argv[],
347			int logo, int slowly, int bpp, float gamma, int noframe, int fsaa)
348			{
349			int i;
350			int rgb_size[3];
351			int w = 640;
352			int h = 480;
353			int done = 0;
354			int frames;
355			Uint32 start_time, this_time;
356	root	1.2	Uint32 video_flags;
357	root	1.1	int value;
358
359			if (SDL_Init (SDL_INIT_VIDEO) < 0)
360			{
361			fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
362			exit (1);
363			}
364
365			/* See if we should detect the display depth */
366			if (bpp == 0)
367			{
368			if (SDL_GetVideoInfo ()->vfmt->BitsPerPixel <= 8)
369			{
370			bpp = 8;
371			}
372			else
373			{
374			bpp = 16; /* More doesn't seem to work */
375			}
376			}
377
378	root	1.2	video_flags = SDL_OPENGL;
379
380	root	1.1	for (i = 1; argv[i]; ++i)
381			{
382			if (strcmp (argv[1], "-fullscreen") == 0)
383			{
384			video_flags \|= SDL_FULLSCREEN;
385			}
386			}
387
388			if (noframe)
389			{
390			video_flags \|= SDL_NOFRAME;
391			}
392
393			/* Initialize the display */
394			switch (bpp)
395			{
396			case 8:
397			rgb_size[0] = 3;
398			rgb_size[1] = 3;
399			rgb_size[2] = 2;
400			break;
401			case 15:
402			case 16:
403			rgb_size[0] = 5;
404			rgb_size[1] = 5;
405			rgb_size[2] = 5;
406			break;
407			default:
408			rgb_size[0] = 8;
409			rgb_size[1] = 8;
410			rgb_size[2] = 8;
411			break;
412			}
413			SDL_GL_SetAttribute (SDL_GL_RED_SIZE, rgb_size[0]);
414			SDL_GL_SetAttribute (SDL_GL_GREEN_SIZE, rgb_size[1]);
415			SDL_GL_SetAttribute (SDL_GL_BLUE_SIZE, rgb_size[2]);
416			SDL_GL_SetAttribute (SDL_GL_DEPTH_SIZE, 16);
417			SDL_GL_SetAttribute (SDL_GL_DOUBLEBUFFER, 1);
418			if (fsaa)
419			{
420			SDL_GL_SetAttribute (SDL_GL_MULTISAMPLEBUFFERS, 1);
421			SDL_GL_SetAttribute (SDL_GL_MULTISAMPLESAMPLES, fsaa);
422			}
423			if (SDL_SetVideoMode (w, h, bpp, video_flags) == NULL)
424			{
425			fprintf (stderr, "Couldn't set GL mode: %s\n", SDL_GetError ());
426			SDL_Quit ();
427			exit (1);
428			}
429
430			printf ("Screen BPP: %d\n", SDL_GetVideoSurface ()->format->BitsPerPixel);
431			printf ("\n");
432			printf ("Vendor : %s\n", glGetString (GL_VENDOR));
433			printf ("Renderer : %s\n", glGetString (GL_RENDERER));
434			printf ("Version : %s\n", glGetString (GL_VERSION));
435			printf ("Extensions : %s\n", glGetString (GL_EXTENSIONS));
436			printf ("\n");
437
438			SDL_GL_GetAttribute (SDL_GL_RED_SIZE, &value);
439			printf ("SDL_GL_RED_SIZE: requested %d, got %d\n", rgb_size[0], value);
440			SDL_GL_GetAttribute (SDL_GL_GREEN_SIZE, &value);
441			printf ("SDL_GL_GREEN_SIZE: requested %d, got %d\n", rgb_size[1], value);
442			SDL_GL_GetAttribute (SDL_GL_BLUE_SIZE, &value);
443			printf ("SDL_GL_BLUE_SIZE: requested %d, got %d\n", rgb_size[2], value);
444			SDL_GL_GetAttribute (SDL_GL_DEPTH_SIZE, &value);
445			printf ("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", bpp, value);
446			SDL_GL_GetAttribute (SDL_GL_DOUBLEBUFFER, &value);
447			printf ("SDL_GL_DOUBLEBUFFER: requested 1, got %d\n", value);
448			if (fsaa)
449			{
450			SDL_GL_GetAttribute (SDL_GL_MULTISAMPLEBUFFERS, &value);
451			printf ("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
452			SDL_GL_GetAttribute (SDL_GL_MULTISAMPLESAMPLES, &value);
453			printf ("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
454			value);
455			}
456
457			/* Set the window manager title bar */
458			SDL_WM_SetCaption ("SDL GL test", "testgl");
459
460			/* Set the gamma for the window */
461			if (gamma != 0.0)
462			{
463			SDL_SetGamma (gamma, gamma, gamma);
464			}
465
466			glViewport (0, 0, w, h);
467			glMatrixMode (GL_PROJECTION);
468			glLoadIdentity ();
469
470			glOrtho (-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);
471
472			glMatrixMode (GL_MODELVIEW);
473			glLoadIdentity ();
474
475			glEnable (GL_DEPTH_TEST);
476
477			glDepthFunc (GL_LESS);
478
479			glShadeModel (GL_SMOOTH);
480
481			/* Loop until done. */
482			start_time = SDL_GetTicks ();
483			frames = 0;
484			while (!done)
485			{
486			GLenum gl_error;
487			char *sdl_error;
488			SDL_Event event;
489
490			/* Do our drawing, too. */
491			glClearColor (0.0, 0.0, 0.0, 1.0);
492			glClear (GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
493
494			glBegin (GL_QUADS);
495
496			glEnd ();
497
498			SDL_GL_SwapBuffers ();
499
500			/* Check for error conditions. */
501			gl_error = glGetError ();
502
503			if (gl_error != GL_NO_ERROR)
504			{
505			fprintf (stderr, "testgl: OpenGL error: %d\n", gl_error);
506			}
507
508			sdl_error = SDL_GetError ();
509
510			if (sdl_error[0] != '\0')
511			{
512			fprintf (stderr, "testgl: SDL error '%s'\n", sdl_error);
513			SDL_ClearError ();
514			}
515
516			/* Allow the user to see what's happening */
517			SDL_Delay (20);
518
519			/* Check if there's a pending event. */
520			while (SDL_PollEvent (&event))
521			{
522			done = HandleEvent (&event);
523			}
524			++frames;
525			}
526
527			/* Print out the frames per second */
528			this_time = SDL_GetTicks ();
529			if (this_time != start_time)
530			{
531			printf ("%2.2f FPS\n",
532			((float) frames / (this_time - start_time)) * 1000.0);
533			}
534
535			if (global_image)
536			{
537			SDL_FreeSurface (global_image);
538			global_image = NULL;
539			}
540			if (global_texture)
541			{
542			glDeleteTextures (1, &global_texture);
543			global_texture = 0;
544			}
545
546			/* Destroy our GL context, etc. */
547			SDL_Quit ();
548			return (0);
549			}
550
551			int
552			main (int argc, char *argv[])
553			{
554			int i, logo;
555			int numtests;
556			int bpp = 0;
557			int slowly;
558			float gamma = 0.0;
559			int noframe = 0;
560			int fsaa = 0;
561
562			logo = 0;
563			slowly = 0;
564			numtests = 1;
565			for (i = 1; argv[i]; ++i)
566			{
567			if (strcmp (argv[i], "-twice") == 0)
568			{
569			++numtests;
570			}
571			if (strcmp (argv[i], "-slow") == 0)
572			{
573			slowly = 1;
574			}
575			if (strcmp (argv[i], "-bpp") == 0)
576			{
577			bpp = atoi (argv[++i]);
578			}
579			if (strcmp (argv[i], "-gamma") == 0)
580			{
581			gamma = (float) atof (argv[++i]);
582			}
583			if (strcmp (argv[i], "-noframe") == 0)
584			{
585			noframe = 1;
586			}
587			if (strcmp (argv[i], "-fsaa") == 0)
588			{
589			++fsaa;
590			}
591			if (strncmp (argv[i], "-h", 2) == 0)
592			{
593			printf
594			("Usage: %s [-twice] [-logo] [-slow] [-bpp n] [-gamma n] [-noframe] [-fsaa]\n",
595			argv[0]);
596			exit (0);
597			}
598			}
599			for (i = 0; i < numtests; ++i)
600			{
601			RunGLTest (argc, argv, logo, slowly, bpp, gamma, noframe, fsaa);
602			}
603			return 0;
604			}