#include "demo.h"
#include "screen.h"
+/* APPROX. 170 FPS Minimum */
+
#define BG_FILENAME "data/grise.png"
#define MIN_SCROLL 32
static short *displacementMap;
-static float scrollSpeedTable[REFLECTION_HEIGHT];
+static float scrollScaleTable[REFLECTION_HEIGHT];
static float scrollTable[REFLECTION_HEIGHT];
static int scrollTableRounded[REFLECTION_HEIGHT];
static int scrollModTable[REFLECTION_HEIGHT];
+static float nearScrollAmount = 0.0f;
static struct screen scr = {
"mike",
/* Convert to 16bpp */
convert32To16((unsigned int*)background, background, backgroundW * NORMALMAP_SCANLINE); /* Normalmap will keep its 32 bit color */
- processNormal();
-
initScrollTables();
+ processNormal();
+
return 0;
}
/* Scale normal with depth and unpack R component (horizontal component) */
static void processNormal() {
int scanline;
- unsigned int *normalmap = (unsigned int*)background;
- normalmap += NORMALMAP_SCANLINE * backgroundW;
- unsigned short *dst = normalmap;
- displacementMap = (short*)dst;
- short *dst2 = displacementMap;
- float scale;
int i;
int x;
short maxDisplacement = 0;
short minDisplacement = 256;
+ unsigned short *dst;
+ short *dst2;
+ unsigned int *normalmap = (unsigned int*)background;
+ normalmap += NORMALMAP_SCANLINE * backgroundW;
+ dst = (unsigned short*)normalmap;
+ displacementMap = (short*)dst;
+ dst2 = displacementMap;
for (scanline = 0; scanline < REFLECTION_HEIGHT; scanline++) {
- scale = 2.0f - (float)scanline / ((float)REFLECTION_HEIGHT - 1);
- scrollModTable[scanline] = (int) (backgroundW / scale + 0.5f);
+ scrollModTable[scanline] = (int) (backgroundW / scrollScaleTable[scanline] + 0.5f);
for (i = 0; i < backgroundW; i++) {
- x = (int)(i * scale + 0.5f);
+ x = (int)(i * scrollScaleTable[scanline] + 0.5f);
if (x < backgroundW) {
- *dst = (unsigned short)normalmap[x] & 0xFF;
+ *dst = (unsigned short)(normalmap[x] >> 8) & 0xFF;
if ((short)*dst > maxDisplacement) maxDisplacement = (short)(*dst);
if ((short)*dst < minDisplacement) minDisplacement = (short)(*dst);
} else {
for (i = 0; i < backgroundW; i++) {
/* Remember that MIN_SCROLL is the padding around the screen, so ti's the maximum displacement we can get (positive & negative) */
*dst2 = 2 * MIN_SCROLL * (*dst2 - minDisplacement) / (maxDisplacement - minDisplacement) - MIN_SCROLL;
+ *dst2 = (short)((float)*dst2 / scrollScaleTable[scanline] + 0.5f); /* Displacements must also scale with distance*/
dst2++;
}
}
}
+static float distanceScale(int scanline) {
+ float farScale, t;
+ farScale = (float)NEAR_SCROLL_SPEED / (float)FAR_SCROLL_SPEED;
+ t = (float)scanline / ((float)REFLECTION_HEIGHT - 1);
+ return 1.0f / (1.0f / farScale + (1.0f - 1.0f / farScale) * t);
+}
+
static void initScrollTables() {
int i = 0;
- float scrollSpeed = FAR_SCROLL_SPEED;
- float speedIncrement = (NEAR_SCROLL_SPEED - FAR_SCROLL_SPEED) / ((float) (REFLECTION_HEIGHT - 1));
for (i = 0; i < REFLECTION_HEIGHT; i++) {
- scrollSpeedTable[i] = scrollSpeed;
- scrollSpeed += speedIncrement;
+ scrollScaleTable[i] = distanceScale(i);
scrollTable[i] = 0.0f;
scrollTableRounded[i] = 0;
}
static void updateScrollTables(float dt) {
int i = 0;
+
+ nearScrollAmount += dt * NEAR_SCROLL_SPEED;
+ nearScrollAmount = (float) fmod(nearScrollAmount, 512.0f);
+
for (i = 0; i < REFLECTION_HEIGHT; i++) {
- scrollTable[i] += scrollSpeedTable[i] * dt;
+ scrollTable[i] = nearScrollAmount / scrollScaleTable[i];
scrollTableRounded[i] = (int)(scrollTable[i] + 0.5f) % scrollModTable[i];
}
-}
\ No newline at end of file
+}