unsigned char *scans;
} RLEBitmap;
-static RLEBitmap createRLEBitmap(unsigned int w, unsigned int h);
-static destroyRLEBitmap(RLEBitmap b);
+static RLEBitmap rleCreate(unsigned int w, unsigned int h);
+static void rleDestroy(RLEBitmap b);
+static void rleBlit(unsigned short *dst, int dstW, int dstH, int dstStride,
+ RLEBitmap bitmap, int blitX, int blitY);
+static void rleBlitScale(unsigned short *dst, int dstW, int dstH, int dstStride,
+ RLEBitmap bitmap, int blitX, int blitY, float scaleX, float scaleY);
+static void rleBlitScaleInv(unsigned short *dst, int dstW, int dstH, int dstStride,
+ RLEBitmap bitmap, int blitX, int blitY, float scaleX, float scaleY);
+static RLEBitmap rleEncode(unsigned char *pixels, unsigned int w, unsigned int h);
#define BG_FILENAME "data/grise.png"
#define GROBJ_01_FILENAME "data/grobj_01.png"
/* Every backBuffer scanline is guaranteed to have that many dummy pixels before and after */
#define PIXEL_PADDING 32
+/* Make sure this is less than PIXEL_PADDING*/
+#define MAX_DISPLACEMENT 16
+
#define MIN_SCROLL PIXEL_PADDING
#define MAX_SCROLL (backgroundW - fb_width - MIN_SCROLL)
-#define FAR_SCROLL_SPEED 50.0f
-#define NEAR_SCROLL_SPEED 400.0f
+#define FAR_SCROLL_SPEED 15.0f
+#define NEAR_SCROLL_SPEED 120.0f
#define HORIZON_HEIGHT 100
#define REFLECTION_HEIGHT (240 - HORIZON_HEIGHT)
static void initScrollTables();
static void updateScrollTables(float dt);
-static RLEBitmap rleEncode(unsigned char *pixels, unsigned int w, unsigned int h);
+
static unsigned short *background = 0;
static unsigned int backgroundW = 0;
img_free_pixels(background);
- destroyRLEBitmap(grobj);
+ rleDestroy(grobj);
}
static void start(long trans_time)
src += backgroundW;
dst += BB_SIZE;
}
-
+
+ /* Blit reflections first, to be displaced */
+ for (i = 0; i < 5; i++) rleBlitScaleInv(backBuffer + PIXEL_PADDING, fb_width, fb_height, BB_SIZE, grobj, 134 + (i-3) * 60, 235, 1.0f, 1.8f);
+
/* Perform displacement */
dst = backBuffer + HORIZON_HEIGHT * BB_SIZE + PIXEL_PADDING;
src = dst + BB_SIZE; /* The pixels to be displaced are 1 scanline below */
dispScanline += backgroundW;
}
+ /* Then after displacement, blit the objects */
+ for (i = 0; i < 5; i++) rleBlit(backBuffer + PIXEL_PADDING, fb_width, fb_height, BB_SIZE, grobj, 134 + (i-3) * 60, 100);
+
/* Blit effect to framebuffer */
src = backBuffer + PIXEL_PADDING;
dst = fb_pixels;
for (scanline = 0; scanline < fb_height; scanline++) {
memcpy(dst, src, fb_width * 2);
- src += BB_SIZE;
+ src += BB_SIZE;
dst += fb_width;
}
+
+
}
/* src and dst can be the same */
for (scanline = 0; scanline < REFLECTION_HEIGHT; scanline++) {
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 = 2 * MAX_DISPLACEMENT * (*dst2 - minDisplacement) / (maxDisplacement - minDisplacement) - MAX_DISPLACEMENT;
*dst2 = (short)((float)*dst2 / scrollScaleTable[scanline] + 0.5f); /* Displacements must also scale with distance*/
dst2++;
}
#define RLE_STREAKS_PER_SCANLINE 4
/* Every streak is encoded by 2 bytes: offset and count of black pixels in the streak */
#define RLE_BYTES_PER_SCANLINE RLE_STREAKS_PER_SCANLINE * 2
+#define RLE_FILL_COLOR 0
+#define RLE_FILL_COLOR_32 ((RLE_FILL_COLOR << 16) | RLE_FILL_COLOR)
-static RLEBitmap createRLEBitmap(unsigned int w, unsigned int h) {
+static RLEBitmap rleCreate(unsigned int w, unsigned int h) {
RLEBitmap ret;
ret.w = w;
ret.h = h;
return ret;
}
-static destroyRLEBitmap(RLEBitmap b) {
+static void rleDestroy(RLEBitmap b) {
free(b.scans);
}
unsigned char *output;
/* https://www.youtube.com/watch?v=RKMR02o1I88&feature=youtu.be&t=55 */
- ret = createRLEBitmap(w, h);
+ ret = rleCreate(w, h);
for (scanline = 0; scanline < h; scanline++) {
output = ret.scans + scanline * RLE_BYTES_PER_SCANLINE;
return ret;
}
+
+static void rleBlit(unsigned short *dst, int dstW, int dstH, int dstStride,
+ RLEBitmap bitmap, int blitX, int blitY)
+{
+ int scanline = 0;
+ int streakPos = 0;
+ int streakLength = 0;
+ int streak = 0;
+ unsigned char *input = bitmap.scans;
+ unsigned short *output;
+ unsigned int *output32;
+
+ dst += blitX + blitY * dstStride;
+
+ for (scanline = blitY; scanline < blitY + bitmap.h; scanline++) {
+ if (scanline < 0 || scanline >= dstH) continue;
+ for (streak = 0; streak < RLE_STREAKS_PER_SCANLINE; streak++) {
+ streakPos = *input++;
+ streakLength = *input++;
+
+ if ((streakPos + blitX) <= 0) continue;
+
+ output = dst + streakPos;
+
+ /* Check if we need to write the first pixel as 16bit */
+ if (streakLength % 2) {
+ *output++ = RLE_FILL_COLOR;
+ }
+
+ /* Then, write 2 pixels at a time */
+ streakLength >>= 1;
+ output32 = (unsigned int*) output;
+ while (streakLength--) {
+ *output32++ = RLE_FILL_COLOR_32;
+ }
+ }
+
+ dst += dstStride;
+ }
+}
+
+static void interpolateScan(unsigned char *output, unsigned char *a, unsigned char *b, float t) {
+ static int div = 1 << 23;
+ int ti, i;
+
+ t += 1.0f;
+ ti = (*((unsigned int*)&t)) & 0x7FFFFF;
+
+ for (i = 0; i < RLE_BYTES_PER_SCANLINE; i++) {
+ *output++ = ((*b++ * ti) + (*a++ * (div - ti))) >> 23;
+ }
+}
+
+static void rleBlitScale(unsigned short *dst, int dstW, int dstH, int dstStride,
+ RLEBitmap bitmap, int blitX, int blitY, float scaleX, float scaleY)
+{
+ int scanline = 0;
+ int streakPos = 0;
+ int streakLength = 0;
+ int streak = 0;
+ unsigned short *output;
+ unsigned int *output32;
+ unsigned char *input;
+ int scanlineCounter = 0;
+ static unsigned char scan[512];
+
+ int blitW = (int) (bitmap.w * scaleX + 0.5f);
+ int blitH = (int)(bitmap.h * scaleY + 0.5f);
+
+ dst += blitX + blitY * dstStride;
+
+ for (scanline = blitY; scanline < blitY + blitH; scanline++) {
+ float normalScan = scanlineCounter / scaleY;
+ unsigned char *scan0 = bitmap.scans + RLE_BYTES_PER_SCANLINE * (int)normalScan;
+ unsigned char *scan1 = scan0 + RLE_BYTES_PER_SCANLINE;
+ normalScan -= (int)normalScan;
+ interpolateScan(scan, scan0, scan1, normalScan);
+ input = scan;
+ scanlineCounter++;
+
+ if (scanline < 0 || scanline >= dstH) continue;
+ for (streak = 0; streak < RLE_STREAKS_PER_SCANLINE; streak++) {
+ streakPos = (int) ((*input++) * scaleX + 0.5f);
+ streakLength = (int)((*input++) * scaleX + 0.5f);
+
+ if ((streakPos + blitX) <= 0) continue;
+
+ output = dst + streakPos;
+
+ /* Check if we need to write the first pixel as 16bit */
+ if (streakLength % 2) {
+ *output++ = RLE_FILL_COLOR;
+ }
+
+ /* Then, write 2 pixels at a time */
+ streakLength >>= 1;
+ output32 = (unsigned int*)output;
+ while (streakLength--) {
+ *output32++ = RLE_FILL_COLOR_32;
+ }
+ }
+
+ dst += dstStride;
+ }
+}
+
+static void rleBlitScaleInv(unsigned short *dst, int dstW, int dstH, int dstStride,
+ RLEBitmap bitmap, int blitX, int blitY, float scaleX, float scaleY)
+{
+ int scanline = 0;
+ int streakPos = 0;
+ int streakLength = 0;
+ int streak = 0;
+ unsigned short *output;
+ unsigned int *output32;
+ unsigned char *input;
+ int scanlineCounter = 0;
+ static unsigned char scan[512];
+
+ int blitW = (int)(bitmap.w * scaleX + 0.5f);
+ int blitH = (int)(bitmap.h * scaleY + 0.5f);
+
+ dst += blitX + blitY * dstStride;
+
+ for (scanline = blitY; scanline > blitY - blitH; scanline--) {
+ float normalScan = scanlineCounter / scaleY;
+ unsigned char *scan0 = bitmap.scans + RLE_BYTES_PER_SCANLINE * (int)normalScan;
+ unsigned char *scan1 = scan0 + RLE_BYTES_PER_SCANLINE;
+ normalScan -= (int)normalScan;
+ interpolateScan(scan, scan0, scan1, normalScan);
+ input = scan;
+ scanlineCounter++;
+
+ if (scanline < 0 || scanline >= dstH) continue;
+ for (streak = 0; streak < RLE_STREAKS_PER_SCANLINE; streak++) {
+ streakPos = (int)((*input++) * scaleX + 0.5f);
+ streakLength = (int)((*input++) * scaleX + 0.5f);
+
+ if ((streakPos + blitX) <= 0) continue;
+
+ output = dst + streakPos;
+
+ /* Check if we need to write the first pixel as 16bit */
+ if (streakLength % 2) {
+ *output++ = RLE_FILL_COLOR;
+ }
+
+ /* Then, write 2 pixels at a time */
+ streakLength >>= 1;
+ output32 = (unsigned int*)output;
+ while (streakLength--) {
+ *output32++ = RLE_FILL_COLOR_32;
+ }
+ }
+
+ dst -= dstStride;
+ }
+}
\ No newline at end of file
projects / dosdemo / commitdiff