--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/android/project/jni/lesson05.c	Tue Aug 17 15:35:56 2010 +1200
@@ -0,0 +1,574 @@
+/*
+ * This code was created by Jeff Molofee '99 
+ * (ported to Linux/SDL by Ti Leggett '01)
+ *
+ * If you've found this code useful, please let me know.
+ *
+ * Visit Jeff at http://nehe.gamedev.net/
+ * 
+ * or for port-specific comments, questions, bugreports etc. 
+ * email to leggett@eecs.tulane.edu
+ */
+ 
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include <signal.h>
+
+#include <android/log.h>
+
+
+#ifdef ANDROID
+#include <GLES/gl.h>
+#else
+#include <GL/gl.h>
+#include <GL/glu.h>
+#endif
+#include "SDL.h"
+
+/* screen width, height, and bit depth */
+#define SCREEN_WIDTH  320
+#define SCREEN_HEIGHT 430
+#define SCREEN_BPP     16
+
+/* Define our booleans */
+#define TRUE  1
+#define FALSE 0
+
+/* This is our SDL surface */
+SDL_Surface *surface;
+
+int rotation = 0;
+
+
+/**************************************
+	gluperspective implementation
+**************************************/
+void gluPerspective(double fovy, double aspect, double zNear, double zFar){
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	double xmin, xmax, ymin, ymax;
+	ymax = zNear * tan(fovy * M_PI / 360.0);
+	ymin = -ymax;
+	xmin = ymin * aspect;
+	xmax = ymax * aspect;
+	glFrustumf(xmin, xmax, ymin, ymax, zNear, zFar);
+}
+
+
+/**************************************
+	  glulookat implementation
+**************************************/
+void gluLookAt(GLfloat eyex, GLfloat eyey, GLfloat eyez,
+          GLfloat centerx, GLfloat centery, GLfloat centerz,
+          GLfloat upx, GLfloat upy, GLfloat upz)
+{
+    GLfloat m[16];
+    GLfloat x[3], y[3], z[3];
+    GLfloat mag;
+    
+    /* Make rotation matrix */
+    
+    /* Z vector */
+    z[0] = eyex - centerx;
+    z[1] = eyey - centery;
+    z[2] = eyez - centerz;
+    mag = sqrt(z[0] * z[0] + z[1] * z[1] + z[2] * z[2]);
+    if (mag) {          /* mpichler, 19950515 */
+        z[0] /= mag;
+        z[1] /= mag;
+        z[2] /= mag;
+    }
+    
+    /* Y vector */
+    y[0] = upx;
+    y[1] = upy;
+    y[2] = upz;
+    
+    /* X vector = Y cross Z */
+    x[0] = y[1] * z[2] - y[2] * z[1];
+    x[1] = -y[0] * z[2] + y[2] * z[0];
+    x[2] = y[0] * z[1] - y[1] * z[0];
+    
+    /* Recompute Y = Z cross X */
+    y[0] = z[1] * x[2] - z[2] * x[1];
+    y[1] = -z[0] * x[2] + z[2] * x[0];
+    y[2] = z[0] * x[1] - z[1] * x[0];
+    
+    /* mpichler, 19950515 */
+    /* cross product gives area of parallelogram, which is < 1.0 for
+     * non-perpendicular unit-length vectors; so normalize x, y here
+     */
+    
+    mag = sqrt(x[0] * x[0] + x[1] * x[1] + x[2] * x[2]);
+    if (mag) {
+        x[0] /= mag;
+        x[1] /= mag;
+        x[2] /= mag;
+    }
+    
+    mag = sqrt(y[0] * y[0] + y[1] * y[1] + y[2] * y[2]);
+    if (mag) {
+        y[0] /= mag;
+        y[1] /= mag;
+        y[2] /= mag;
+    }
+    
+#define M(row,col)  m[col*4+row]
+    M(0, 0) = x[0];
+    M(0, 1) = x[1];
+    M(0, 2) = x[2];
+    M(0, 3) = 0.0;
+    M(1, 0) = y[0];
+    M(1, 1) = y[1];
+    M(1, 2) = y[2];
+    M(1, 3) = 0.0;
+    M(2, 0) = z[0];
+    M(2, 1) = z[1];
+    M(2, 2) = z[2];
+    M(2, 3) = 0.0;
+    M(3, 0) = 0.0;
+    M(3, 1) = 0.0;
+    M(3, 2) = 0.0;
+    M(3, 3) = 1.0;
+#undef M
+    glMultMatrixf(m);
+    
+    /* Translate Eye to Origin */
+    glTranslatef(-eyex, -eyey, -eyez);
+    
+}
+
+
+
+
+
+/* function to release/destroy our resources and restoring the old desktop */
+void Quit( int returnCode )
+{
+    /* clean up the window */
+    SDL_Quit( );
+
+    /* and exit appropriately */
+    exit( returnCode );
+}
+
+/* function to reset our viewport after a window resize */
+int resizeWindow( int width, int height )
+{
+    /* Height / width ration */
+    GLfloat ratio;
+ 
+    /* Protect against a divide by zero */
+   if ( height == 0 )
+	height = 1;
+
+    ratio = ( GLfloat )width / ( GLfloat )height;
+
+    /* Setup our viewport. */
+    glViewport( 0, 0, ( GLsizei )width, ( GLsizei )height );
+
+    /* change to the projection matrix and set our viewing volume. */
+    glMatrixMode( GL_PROJECTION );
+    glLoadIdentity( );
+
+    /* Set our perspective */
+    gluPerspective( 45.0f, ratio, 0.1f, 100.0f );
+
+    /* Make sure we're chaning the model view and not the projection */
+    glMatrixMode( GL_MODELVIEW );
+
+    /* Reset The View */
+    glLoadIdentity( );
+
+    return( TRUE );
+}
+
+/* function to handle key press events */
+void handleKeyPress( SDL_keysym *keysym )
+{
+    switch ( keysym->sym )
+	{
+	case SDLK_ESCAPE:
+	    /* ESC key was pressed */
+	    Quit( 0 );
+	    break;
+	case SDLK_F1:
+	    /* F1 key was pressed
+	     * this toggles fullscreen mode
+	     */
+	    SDL_WM_ToggleFullScreen( surface );
+	    break;
+    case SDLK_LEFT:
+        rotation -= 30;
+        break;
+
+    case SDLK_RIGHT:
+        rotation += 30;
+        break;
+        
+	default:
+	    break;
+	}
+
+    __android_log_print(ANDROID_LOG_INFO, "SDL","Keycode: %d, %d, %d\n", keysym->sym, SDLK_LEFT, SDLK_RIGHT);
+
+    return;
+}
+
+/* general OpenGL initialization function */
+int initGL( GLvoid )
+{
+
+    /* Enable smooth shading */
+    glShadeModel( GL_SMOOTH );
+
+    /* Set the background black */
+    glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
+
+    /* Depth buffer setup */
+    //glClearDepth( 1.0f );
+
+    /* Enables Depth Testing */
+    glEnable( GL_DEPTH_TEST );
+
+    /* The Type Of Depth Test To Do */
+    glDepthFunc( GL_LEQUAL );
+
+    /* Really Nice Perspective Calculations */
+    glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
+
+    return( TRUE );
+}
+
+/* Here goes our drawing code */
+int drawGLScene( GLvoid )
+{
+      
+	static int Frames = 0;
+	static int T0 = 0;
+	
+    glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
+
+    glClearColorx(0,0,0,255);
+    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(45, (float)SCREEN_WIDTH / SCREEN_HEIGHT, 0.5f, 150);
+
+    glMatrixMode(GL_MODELVIEW);
+
+    glLoadIdentity();
+
+	//Camera
+	gluLookAt(0,0,5, 0,0,0, 0,1,0);
+			
+	//Draw a triangle
+	//glRotatef(iRot, 0, 1, 0);
+
+	glRotatef( rotation, 0.0f, 1.0f, 0.0f );
+
+
+	glEnableClientState (GL_VERTEX_ARRAY);
+	glEnableClientState (GL_COLOR_ARRAY);
+	
+	/* Rotate The Triangle On The Y axis ( NEW ) */
+    //glRotatef( Frames % 360, 0.0f, 1.0f, 0.0f );
+
+    /* GLES variant of drawing a triangle */
+    const GLfloat triVertices[][9] = {
+      {     /* Front Triangle */
+	 0.0f,  1.0f,  0.0f,               /* Top Of Triangle               */
+	-1.0f, -1.0f,  1.0f,               /* Left Of Triangle              */
+	 1.0f, -1.0f,  1.0f                /* Right Of Triangle             */
+      }, {  /* Right Triangle */
+	 0.0f,  1.0f,  0.0f,               /* Top Of Triangle               */
+	 1.0f, -1.0f,  1.0f,               /* Left Of Triangle              */
+	 1.0f, -1.0f, -1.0f                /* Right Of Triangle             */
+      }, {  /* Back Triangle */
+	 0.0f,  1.0f,  0.0f,               /* Top Of Triangle               */
+	 1.0f, -1.0f, -1.0f,               /* Left Of Triangle              */
+	-1.0f, -1.0f, -1.0f                /* Right Of Triangle             */
+      }, {  /* Left Triangle */
+	 0.0f,  1.0f,  0.0f,               /* Top Of Triangle               */
+	-1.0f, -1.0f, -1.0f,               /* Left Of Triangle              */
+	-1.0f, -1.0f,  1.0f                /* Right Of Triangle             */
+      }
+    };
+
+    /* unlike GL, GLES does not support RGB. We have to use RGBA instead */
+    const GLfloat triColors[][12] = {
+      {     /* Front triangle */
+        1.0f, 0.0f, 0.0f, 1.0f,            /* Red                           */
+	0.0f, 1.0f, 0.0f, 1.0f,            /* Green                         */
+	0.0f, 0.0f, 1.0f, 1.0f             /* Blue                          */
+      }, {  /* Right triangle */
+        1.0f, 0.0f, 0.0f, 1.0f,            /* Red                           */
+	0.0f, 0.0f, 1.0f, 1.0f,            /* Blue                          */
+	0.0f, 1.0f, 0.0f, 1.0f             /* Green                         */
+      }, {  /* Back triangle */
+        1.0f, 0.0f, 0.0f, 1.0f,            /* Red                           */
+	0.0f, 1.0f, 0.0f, 1.0f,            /* Green                         */
+	0.0f, 0.0f, 1.0f, 1.0f             /* Blue                          */
+      }, {  /* Left triangle */
+        1.0f, 0.0f, 0.0f, 1.0f,            /* Red                           */
+	0.0f, 0.0f, 1.0f, 1.0f,            /* Blue                          */
+	0.0f, 1.0f, 0.0f, 1.0f             /* Green                         */
+      }
+    };
+
+    glEnableClientState(GL_COLOR_ARRAY);
+
+    int tri=0;
+
+    /* Loop through all Triangles */
+    for(tri=0;tri<sizeof(triVertices)/(9*sizeof(GLfloat));tri++) 
+    {
+      glVertexPointer(3, GL_FLOAT, 0, triVertices[tri]);
+      glColorPointer(4, GL_FLOAT, 0, triColors[tri]);
+      
+      glDrawArrays(GL_TRIANGLE_STRIP, 0, 3);
+    }
+		
+    //__android_log_print(ANDROID_LOG_INFO, "SDL", "render %d", Frames++);
+
+    /* Draw it to the screen */
+    SDL_GL_SwapBuffers( );
+
+    /* Gather our frames per second */
+    Frames++;
+    {
+	GLint t = SDL_GetTicks();
+	if (t - T0 >= 5000) {
+	    GLfloat seconds = (t - T0) / 1000.0;
+	    GLfloat fps = Frames / seconds;
+	    __android_log_print(ANDROID_LOG_INFO, "SDL","%d frames in %g seconds = %g FPS\n", Frames, seconds, fps);
+	    T0 = t;
+	    Frames = 0;
+	}
+    }
+
+    rotation++;
+
+    return( TRUE );
+}
+
+
+struct
+{
+    SDL_AudioSpec spec;
+    Uint8 *sound;               /* Pointer to wave data */
+    Uint32 soundlen;            /* Length of wave data */
+    int soundpos;               /* Current play position */
+} wave;
+
+void SDLCALL
+fillerup(void *unused, Uint8 * stream, int len)
+{
+    __android_log_print(ANDROID_LOG_INFO, "SDL","FILLERUP\n");
+    
+    Uint8 *waveptr;
+    int waveleft;
+
+    /* Set up the pointers */
+    waveptr = wave.sound + wave.soundpos;
+    waveleft = wave.soundlen - wave.soundpos;
+
+    /* Go! */
+    while (waveleft <= len) {
+        SDL_memcpy(stream, waveptr, waveleft);
+        stream += waveleft;
+        len -= waveleft;
+        waveptr = wave.sound;
+        waveleft = wave.soundlen;
+        wave.soundpos = 0;
+    }
+    SDL_memcpy(stream, waveptr, len);
+    wave.soundpos += len;
+}
+
+void testAudio(){
+
+    const char *file = "/sdcard/sample.wav";
+
+    /* Load the SDL library */
+    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
+        __android_log_print(ANDROID_LOG_INFO, "SDL","Couldn't initialize SDL Audio: %s\n", SDL_GetError());
+        return;
+    }else{
+        __android_log_print(ANDROID_LOG_INFO, "SDL","Init audio ok\n");
+    }
+
+    /* Load the wave file into memory */
+    if (SDL_LoadWAV(file, &wave.spec, &wave.sound, &wave.soundlen) == NULL) {
+        __android_log_print(ANDROID_LOG_INFO, "SDL", "Couldn't load %s: %s\n", file, SDL_GetError());
+        return;
+    }
+
+    wave.spec.callback = fillerup;
+
+    __android_log_print(ANDROID_LOG_INFO, "SDL","Loaded: %d\n", wave.soundlen);
+
+
+    /* Initialize fillerup() variables */
+    if (SDL_OpenAudio(&wave.spec, NULL) < 0) {
+        __android_log_print(ANDROID_LOG_INFO, "SDL", "Couldn't open audio: %s\n", SDL_GetError());
+        SDL_FreeWAV(wave.sound);
+        return;
+    }
+
+     __android_log_print(ANDROID_LOG_INFO, "SDL","Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
+
+    /* Let the audio run */
+    SDL_PauseAudio(0);
+
+     __android_log_print(ANDROID_LOG_INFO, "SDL","Playing\n");
+    
+    while (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING){
+         //__android_log_print(ANDROID_LOG_INFO, "SDL","Still playing\n");
+        SDL_Delay(100);
+    }
+
+     __android_log_print(ANDROID_LOG_INFO, "SDL","Closing down\n");
+
+    /* Clean up on signal */
+    SDL_CloseAudio();
+    SDL_FreeWAV(wave.sound);
+}
+
+int SDL_main( int argc, char **argv )
+{
+
+	__android_log_print(ANDROID_LOG_INFO, "SDL","entry\n");
+
+    /* Flags to pass to SDL_SetVideoMode */
+    int videoFlags;
+    /* main loop variable */
+    int done = FALSE;
+    /* used to collect events */
+    SDL_Event event;
+    /* this holds some info about our display */
+    const SDL_VideoInfo *videoInfo;
+    /* whether or not the window is active */
+    int isActive = TRUE;
+
+    /* initialize SDL */
+    if ( SDL_Init( SDL_INIT_VIDEO ) < 0 )
+	{
+	    __android_log_print(ANDROID_LOG_INFO, "SDL", "Video initialization failed: %s\n",
+		     SDL_GetError( ) );
+	    Quit( 1 );
+	}
+
+    /* Fetch the video info */
+    videoInfo = SDL_GetVideoInfo( );
+
+    if ( !videoInfo )
+	{
+	    __android_log_print(ANDROID_LOG_INFO, "SDL", "Video query failed: %s\n",
+		     SDL_GetError( ) );
+	    Quit( 1 );
+	}
+
+    /* the flags to pass to SDL_SetVideoMode */
+    videoFlags  = SDL_OPENGL;          /* Enable OpenGL in SDL */
+    videoFlags |= SDL_GL_DOUBLEBUFFER; /* Enable double buffering */
+    videoFlags |= SDL_HWPALETTE;       /* Store the palette in hardware */
+    videoFlags |= SDL_RESIZABLE;       /* Enable window resizing */
+
+    /* This checks to see if surfaces can be stored in memory */
+    if ( videoInfo->hw_available )
+	videoFlags |= SDL_HWSURFACE;
+    else
+	videoFlags |= SDL_SWSURFACE;
+
+    /* This checks if hardware blits can be done */
+    if ( videoInfo->blit_hw )
+	videoFlags |= SDL_HWACCEL;
+
+    /* Sets up OpenGL double buffering */
+    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
+
+    /* get a SDL surface */
+    surface = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP,
+				videoFlags );
+
+    /* Verify there is a surface */
+    if ( !surface )
+	{
+	    __android_log_print(ANDROID_LOG_INFO, "SDL",  "Video mode set failed: %s\n", SDL_GetError( ) );
+	    Quit( 1 );
+	}
+
+	__android_log_print(ANDROID_LOG_INFO, "SDL","Made a video mode!\n");
+
+    /* initialize OpenGL */
+    initGL( );
+
+    /* resize the initial window */
+    resizeWindow( SCREEN_WIDTH, SCREEN_HEIGHT );
+
+
+    //testAudio();
+
+
+    /* wait for events */ 
+    while ( !done )
+	{
+	    /* handle the events in the queue */
+
+	    while ( SDL_PollEvent( &event ) )
+		{
+		    switch( event.type )
+			{
+			case SDL_ACTIVEEVENT:
+			    /* Something's happend with our focus
+			     * If we lost focus or we are iconified, we
+			     * shouldn't draw the screen
+			     */
+			    if ( event.active.gain == 0 )
+				isActive = FALSE;
+			    else
+				isActive = TRUE;
+			    break;			    
+			case SDL_VIDEORESIZE:
+			    /* handle resize event */
+			    surface = SDL_SetVideoMode( event.resize.w,
+							event.resize.h,
+							16, videoFlags );
+			    if ( !surface )
+				{
+				    __android_log_print(ANDROID_LOG_INFO, "SDL","Could not get a surface after resize: %s\n", SDL_GetError( ) );
+				    Quit( 1 );
+				}
+			    resizeWindow( event.resize.w, event.resize.h );
+			    break;
+			case SDL_KEYDOWN:
+			    /* handle key presses */
+			    handleKeyPress( &event.key.keysym );
+			    break;
+			case SDL_QUIT:
+			    /* handle quit requests */
+			    done = TRUE;
+			    __android_log_print(ANDROID_LOG_INFO, "SDL","App is shutting down\n");
+			    break;
+			default:
+			    break;
+			}
+		}
+
+	    /* draw the scene */
+	    if ( isActive )
+		drawGLScene( );
+	}
+
+    /* clean ourselves up and exit */
+    Quit( 0 );
+
+    /* Should never get here */
+    return( 0 );
+}
+
+