10 #define BG_FILENAME "data/grise.png"
13 #define MAX_SCROLL (backgroundW - fb_width - MIN_SCROLL)
15 #define FAR_SCROLL_SPEED 50.0f
16 #define NEAR_SCROLL_SPEED 400.0f
18 #define HORIZON_HEIGHT 100
19 #define REFLECTION_HEIGHT (240 - HORIZON_HEIGHT)
21 #define NORMALMAP_SCANLINE 372
23 static int init(void);
24 static void destroy(void);
25 static void start(long trans_time);
26 static void stop(long trans_time);
27 static void draw(void);
29 static void convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount);
30 static void processNormal();
31 static void initScrollTables();
32 static void updateScrollTables(float dt);
34 static unsigned short *background = 0;
35 static unsigned int backgroundW = 0;
36 static unsigned int backgroundH = 0;
38 static unsigned int lastFrameTime = 0;
39 static float lastFrameDuration = 0.0f;
41 static float scrollSpeedTable[REFLECTION_HEIGHT];
42 static float scrollTable[REFLECTION_HEIGHT];
43 static int scrollTableRounded[REFLECTION_HEIGHT];
44 static int scrollModTable[REFLECTION_HEIGHT];
46 static struct screen scr = {
55 struct screen *mike_screen(void)
63 if (!(background = img_load_pixels(BG_FILENAME, &backgroundW, &backgroundH, IMG_FMT_RGBA32))) {
64 fprintf(stderr, "failed to load image " BG_FILENAME "\n");
68 /* Convert to 16bpp */
69 convert32To16((unsigned int*)background, background, backgroundW * NORMALMAP_SCANLINE); /* Normalmap will keep its 32 bit color */
78 static void destroy(void)
80 //img_free_pixels(background);
83 static void start(long trans_time)
85 lastFrameTime = time_msec;
88 static void stop(long trans_time)
92 static void draw(void)
94 int scroll = MIN_SCROLL + (MAX_SCROLL - MIN_SCROLL) * mouse_x / fb_width;
95 unsigned short *dst = fb_pixels;
96 unsigned short *src = background + scroll;
100 lastFrameDuration = (time_msec - lastFrameTime) / 1000.0f;
101 lastFrameTime = time_msec;
103 for (scanline = 0; scanline < fb_height; scanline++) {
104 memcpy(dst, src, fb_width * 2);
109 updateScrollTables(lastFrameDuration);
112 dst += 100 * fb_width;
113 src = background + NORMALMAP_SCANLINE * backgroundW * 2;
114 for (scanline = 0; scanline < REFLECTION_HEIGHT; scanline++) {
115 for (i = 0; i < fb_width; i++) {
116 *dst++ = src[(i + scrollTableRounded[scanline]) % scrollModTable[scanline]];
122 /* src and dst can be the same */
123 static void convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount) {
127 *dst16++ = ((p << 8) & 0xF800) /* R */
128 | ((p >> 5) & 0x07E0) /* G */
129 | ((p >> 19) & 0x001F); /* B */
134 /* Normal map preprocessing */
135 /* Scale normal with depth and unpack R component (horizontal component) */
136 static void processNormal() {
138 unsigned int *normalmap = (unsigned int*)background;
139 normalmap += NORMALMAP_SCANLINE * backgroundW;
140 unsigned short *dst = normalmap;
145 for (scanline = 0; scanline < REFLECTION_HEIGHT; scanline++) {
146 scale = 2.0f - (float)scanline / ((float)REFLECTION_HEIGHT - 1);
147 scrollModTable[scanline] = (int) (backgroundW / scale + 0.5f);
148 for (i = 0; i < backgroundW; i++) {
149 x = (int)(i * scale + 0.5f);
150 *dst++ = x < backgroundW ? normalmap[x] & 0xFF : 0;
152 normalmap += backgroundW;
156 static void initScrollTables() {
158 float scrollSpeed = FAR_SCROLL_SPEED;
159 float speedIncrement = (NEAR_SCROLL_SPEED - FAR_SCROLL_SPEED) / ((float) (REFLECTION_HEIGHT - 1));
160 for (i = 0; i < REFLECTION_HEIGHT; i++) {
161 scrollSpeedTable[i] = scrollSpeed;
162 scrollSpeed += speedIncrement;
163 scrollTable[i] = 0.0f;
164 scrollTableRounded[i] = 0;
169 static void updateScrollTables(float dt) {
171 for (i = 0; i < REFLECTION_HEIGHT; i++) {
172 scrollTable[i] += scrollSpeedTable[i] * dt;
173 scrollTableRounded[i] = (int)(scrollTable[i] + 0.5f) % scrollModTable[i];