--- /dev/null
+#include "demo.h"
+#include "imago2.h"
+#include "screen.h"
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <RleBitmap.h>
+
+/* APPROX. 170 FPS Minimum */
+
+static int init(void);
+static void destroy(void);
+static void start(long trans_time);
+static void stop(long trans_time);
+static void draw(void);
+
+static void updatePropeller(float t, RleBitmap *rle);
+
+static unsigned short *backBuffer;
+
+static unsigned char miniFXBuffer[1024];
+
+static long lastFrameTime = 0;
+
+static struct screen scr = {"minifx", init, destroy, start, 0, draw};
+
+struct screen *minifx_screen(void) {
+ return &scr;
+}
+
+static int init(void) {
+ /* Allocate back buffer */
+ backBuffer = (unsigned short *)calloc(FB_WIDTH * FB_HEIGHT, sizeof(unsigned short));
+
+ return 0;
+}
+
+static void destroy(void) {
+ free(backBuffer);
+ backBuffer = 0;
+}
+
+static void start(long trans_time) { lastFrameTime = time_msec; }
+
+static void draw(void) {
+ long lastFrameDuration = (time_msec - lastFrameTime) / 1000.0f;
+ lastFrameTime = time_msec;
+
+ int clearColor = 0x888888;
+ unsigned short clearColor16 = ((clearColor << 8) & 0xF800) /* R */
+ | ((clearColor >> 5) & 0x07E0) /* G */
+ | ((clearColor >> 19) & 0x001F); /* B */
+ for (int i=0; i<FB_WIDTH * FB_HEIGHT; i++) {
+ backBuffer[i] = clearColor16;
+ }
+
+ /* For now create / destroy in each frame. We will manage these later */
+ RleBitmap *rle = rleCreate(32, 32);
+
+ updatePropeller(time_msec / 1000.0f, rle);
+ int stride = FB_WIDTH;
+ /*
+ rleBlit(rle, backBuffer, FB_WIDTH, FB_HEIGHT, stride,
+ 100, 100);
+ */
+
+ rleBlitScale(rle, backBuffer, FB_WIDTH, FB_HEIGHT, stride, 50,
+ 50, 3.0, 3.0);
+
+ rleDestroy(rle);
+
+ /* Blit effect to framebuffer */
+ memcpy(fb_pixels, backBuffer, FB_WIDTH * FB_HEIGHT * sizeof(unsigned short));
+ swap_buffers(0);
+}
+
+
+#define PROPELLER_CIRCLE_RADIUS 18
+#define PROPELLER_CIRCLE_RADIUS_SQ (PROPELLER_CIRCLE_RADIUS * PROPELLER_CIRCLE_RADIUS)
+
+static struct {
+ int circleX[3];
+ int circleY[3];
+} propellerState;
+
+static void updatePropeller(float t, RleBitmap *rle) {
+
+ t *= 0.1; /* Slow-mo to see what happens */
+ int i, j;
+ int cx, cy, count = 0;
+ unsigned char *dst;
+ float x = 0.0f;
+ float y = 18.0f;
+ float nx, ny;
+ float cost, sint;
+ static float sin120 = 0.86602540378f;
+ static float cos120 = -0.5f;
+
+ /* Rotate */
+ sint = sin(t);
+ cost = cos(t);
+ nx = x * cost - y * sint;
+ ny = y * cost + x * sint;
+ x = nx;
+ y = ny;
+ propellerState.circleX[0] = (int)(x + 0.5f) + 16;
+ propellerState.circleY[0] = (int)(y + 0.5f) + 16;
+
+ /* Rotate by 120 degrees, for the second circle */
+ nx = x * cos120 - y * sin120;
+ ny = y * cos120 + x * sin120;
+ x = nx;
+ y = ny;
+ propellerState.circleX[1] = (int)(x + 0.5f) + 16;
+ propellerState.circleY[1] = (int)(y + 0.5f) + 16;
+
+ /* 3rd circle */
+ nx = x * cos120 - y * sin120;
+ ny = y * cos120 + x * sin120;
+ x = nx;
+ y = ny;
+ propellerState.circleX[2] = (int)(x + 0.5f) + 16;
+ propellerState.circleY[2] = (int)(y + 0.5f) + 16;
+
+ /* Write effect to the mini fx buffer*/
+ dst = miniFXBuffer;
+ for (j = 0; j < 32; j++) {
+ for (i = 0; i < 32; i++) {
+ count = 0;
+
+ /* First circle */
+ cx = propellerState.circleX[0] - i;
+ cy = propellerState.circleY[0] - j;
+ if (cx * cx + cy * cy < PROPELLER_CIRCLE_RADIUS_SQ)
+ count++;
+
+ /* 2nd circle */
+ cx = propellerState.circleX[1] - i;
+ cy = propellerState.circleY[1] - j;
+ if (cx * cx + cy * cy < PROPELLER_CIRCLE_RADIUS_SQ)
+ count++;
+
+ /* 3rd circle */
+ cx = propellerState.circleX[2] - i;
+ cy = propellerState.circleY[2] - j;
+ if (cx * cx + cy * cy < PROPELLER_CIRCLE_RADIUS_SQ)
+ count++;
+
+ *dst++ = count >= 2;
+ }
+ }
+
+ /* Then, encode to rle */
+ rleEncode(rle, miniFXBuffer, 32, 32);
+
+ /* Distribute the produced streaks so that they don't produce garbage when interpolated */
+ rleDistributeStreaks(rle);
+}
+#include "demo.h"
+#include "imago2.h"
+#include "screen.h"
+#include <assert.h>
+#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <math.h>
-#include <assert.h>
-#include "imago2.h"
-#include "demo.h"
-#include "screen.h"
-/* APPROX. 170 FPS Minimum */
+#include <RleBitmap.h>
-typedef struct {
- unsigned int w, h;
- unsigned char *scans;
-} RLEBitmap;
-
-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(RLEBitmap *b, unsigned char *pixels, unsigned int w, unsigned int h);
+/* APPROX. 170 FPS Minimum */
static void updatePropeller(float t);
#define BG_FILENAME "data/grise.png"
#define GROBJ_01_FILENAME "data/grobj_01.png"
-#define BB_SIZE 512 /* Let's use a power of 2. Maybe we'll zoom/rotate the effect */
+#define BB_SIZE 512 /* Let's use a power of 2. Maybe we'll zoom/rotate the effect */
/* Every backBuffer scanline is guaranteed to have that many dummy pixels before and after */
#define PIXEL_PADDING 32
static void initScrollTables();
static void updateScrollTables(float dt);
-
-
static unsigned short *background = 0;
static int backgroundW = 0;
static int backgroundH = 0;
static unsigned char miniFXBuffer[1024];
-static RLEBitmap *grobj = 0;
-static RLEBitmap *rlePropeller = 0;
+static RleBitmap *grobj = 0;
+static RleBitmap *rlePropeller = 0;
-static struct screen scr = {
- "galaxyrise",
- init,
- destroy,
- start,
- 0,
- draw
-};
+static struct screen scr = {"galaxyrise", init, destroy, start, 0, draw};
-struct screen *grise_screen(void)
-{
+struct screen *grise_screen(void) {
return &scr;
}
-static int init(void)
-{
+static int init(void) {
unsigned char *tmpBitmap;
int tmpBitmapW, tmpBitmapH;
/* Allocate back buffer */
- backBuffer = (unsigned short*) calloc(BB_SIZE * BB_SIZE, sizeof(unsigned short));
+ backBuffer = (unsigned short *)calloc(BB_SIZE * BB_SIZE, sizeof(unsigned short));
- /* grise.png contains the background (horizon), baked reflection and normalmap for displacement */
- if (!(background = img_load_pixels(BG_FILENAME, &backgroundW, &backgroundH, IMG_FMT_RGBA32))) {
+ /* grise.png contains the background (horizon), baked reflection and normalmap for
+ * displacement */
+ if (!(background =
+ img_load_pixels(BG_FILENAME, &backgroundW, &backgroundH, IMG_FMT_RGBA32))) {
fprintf(stderr, "failed to load image " BG_FILENAME "\n");
return -1;
}
/* Convert to 16bpp */
- convert32To16((unsigned int*)background, background, backgroundW * NORMALMAP_SCANLINE); /* Normalmap will keep its 32 bit color */
+ convert32To16((unsigned int *)background, background,
+ backgroundW * NORMALMAP_SCANLINE); /* Normalmap will keep its 32 bit color */
/* Load reflected objects */
- if (!(tmpBitmap = img_load_pixels(GROBJ_01_FILENAME, &tmpBitmapW, &tmpBitmapH, IMG_FMT_GREY8))) {
+ if (!(tmpBitmap =
+ img_load_pixels(GROBJ_01_FILENAME, &tmpBitmapW, &tmpBitmapH, IMG_FMT_GREY8))) {
fprintf(stderr, "failed to load image " GROBJ_01_FILENAME "\n");
return -1;
}
return 0;
}
-static void destroy(void)
-{
+static void destroy(void) {
free(backBuffer);
backBuffer = 0;
rleDestroy(grobj);
}
-static void start(long trans_time)
-{
- lastFrameTime = time_msec;
-}
-
+static void start(long trans_time) { lastFrameTime = time_msec; }
-static void draw(void)
-{
+static void draw(void) {
int scroll = MIN_SCROLL + (MAX_SCROLL - MIN_SCROLL) * mouse_x / FB_WIDTH;
unsigned short *dst = backBuffer + PIXEL_PADDING;
unsigned short *src = background + scroll;
}
/* Blit reflections first, to be displaced */
- for (i = 0; i < 5; i++) rleBlitScaleInv(backBuffer + PIXEL_PADDING, FB_WIDTH, FB_HEIGHT, BB_SIZE, rlePropeller, 134 + (i-3) * 60, 200, 1.0f, 1.8f);
+ for (i = 0; i < 5; i++)
+ rleBlitScaleInv(rlePropeller, backBuffer + PIXEL_PADDING, FB_WIDTH, FB_HEIGHT,
+ BB_SIZE, 134 + (i - 3) * 60, 200, 1.0f, 1.8f);
/* Perform displacement */
dst = backBuffer + HORIZON_HEIGHT * BB_SIZE + PIXEL_PADDING;
for (i = 0; i < FB_WIDTH; i++) {
/* Try to immitate modulo without the division */
- if (i == md) accum += md;
+ if (i == md)
+ accum += md;
scrolledIndex = i - accum + sc;
- if (scrolledIndex >= md) scrolledIndex -= md;
+ if (scrolledIndex >= md)
+ scrolledIndex -= md;
/* Displace */
d = dispScanline[scrolledIndex];
}
/* Then after displacement, blit the objects */
- for (i = 0; i < 5; i++) rleBlit(backBuffer + PIXEL_PADDING, FB_WIDTH, FB_HEIGHT, BB_SIZE, rlePropeller, 134 + (i-3) * 60, 100);
+ for (i = 0; i < 5; i++)
+ rleBlit(rlePropeller, backBuffer + PIXEL_PADDING, FB_WIDTH, FB_HEIGHT, BB_SIZE,
+ 134 + (i - 3) * 60, 100);
/* Blit effect to framebuffer */
src = backBuffer + PIXEL_PADDING;
unsigned int p;
while (pixelCount) {
p = *src32++;
- *dst16++ = ((p << 8) & 0xF800) /* R */
- | ((p >> 5) & 0x07E0) /* G */
- | ((p >> 19) & 0x001F); /* B */
+ *dst16++ = ((p << 8) & 0xF800) /* R */
+ | ((p >> 5) & 0x07E0) /* G */
+ | ((p >> 19) & 0x001F); /* B */
pixelCount--;
}
}
short minDisplacement = 256;
unsigned short *dst;
short *dst2;
- unsigned int *normalmap = (unsigned int*)background;
+ unsigned int *normalmap = (unsigned int *)background;
normalmap += NORMALMAP_SCANLINE * backgroundW;
- dst = (unsigned short*)normalmap;
- displacementMap = (short*)dst;
+ dst = (unsigned short *)normalmap;
+ displacementMap = (short *)dst;
dst2 = displacementMap;
for (scanline = 0; scanline < REFLECTION_HEIGHT; scanline++) {
- scrollModTable[scanline] = (int) (backgroundW / scrollScaleTable[scanline] + 0.5f);
+ scrollModTable[scanline] = (int)(backgroundW / scrollScaleTable[scanline] + 0.5f);
for (i = 0; i < backgroundW; i++) {
x = (int)(i * scrollScaleTable[scanline] + 0.5f);
if (x < backgroundW) {
*dst = (unsigned short)(normalmap[x] >> 8) & 0xFF;
- if ((short)*dst > maxDisplacement) maxDisplacement = (short)(*dst);
- if ((short)*dst < minDisplacement) minDisplacement = (short)(*dst);
+ if ((short)*dst > maxDisplacement)
+ maxDisplacement = (short)(*dst);
+ if ((short)*dst < minDisplacement)
+ minDisplacement = (short)(*dst);
} else {
*dst = 0;
}
/* Second pass - subtract half maximum displacement to displace in both directions */
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 * MAX_DISPLACEMENT * (*dst2 - minDisplacement) / (maxDisplacement - minDisplacement) - MAX_DISPLACEMENT;
- *dst2 = (short)((float)*dst2 / scrollScaleTable[scanline] + 0.5f); /* Displacements must also scale with distance*/
+ /* Remember that MIN_SCROLL is the padding around the screen, so ti's the
+ * maximum displacement we can get (positive & negative) */
+ *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++;
}
}
}
}
-
static void updateScrollTables(float dt) {
int i = 0;
nearScrollAmount += dt * NEAR_SCROLL_SPEED;
- nearScrollAmount = (float) fmod(nearScrollAmount, 512.0f);
+ nearScrollAmount = (float)fmod(nearScrollAmount, 512.0f);
for (i = 0; i < REFLECTION_HEIGHT; i++) {
scrollTable[i] = nearScrollAmount / scrollScaleTable[i];
}
/* -------------------------------------------------------------------------------------------------
- * RLE STUFF
+ * PROPELLER STUFF
* -------------------------------------------------------------------------------------------------
*/
-/* Limit streak count per scanline so we can directly jump to specific scanline */
-#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)
-
-#define RLE_FIXED_BITS 16
-
-static int rleByteCount(int w, int h) {
- return h * RLE_BYTES_PER_SCANLINE + w;
-}
-
-static RLEBitmap *rleCreate(unsigned int w, unsigned int h) {
- RLEBitmap *ret = (RLEBitmap*)malloc(sizeof(RLEBitmap));
- ret->w = w;
- ret->h = h;
-
- /* Add some padding at the end of the buffer, with the worst case for a scanline (w/2 streaks) */
- ret->scans = (unsigned char*) calloc(rleByteCount(w, h), 1);
-
- return ret;
-}
-
-static void rleDestroy(RLEBitmap *b) {
- if (!b) return;
- free(b->scans);
- free(b);
-}
-
-static RLEBitmap *rleEncode(RLEBitmap *b, unsigned char *pixels, unsigned int w, unsigned int h) {
- int scanline;
- int i;
- int penActive = 0;
- int counter = 0;
- int accum = 0;
- unsigned char *output;
-
- /* https://www.youtube.com/watch?v=RKMR02o1I88&feature=youtu.be&t=55 */
- if (!b) b = rleCreate(w, h);
- else memset(b->scans, 0, rleByteCount(b->w, b->h)); /* The following code assumes cleared array */
-
- for (scanline = 0; scanline < h; scanline++) {
- output = b->scans + scanline * RLE_BYTES_PER_SCANLINE;
- accum = 0;
- for (i = 0; i < w; i++) {
- if (*pixels++) {
- if (penActive) {
- if (counter >= PIXEL_PADDING) {
- *output++ = (unsigned char) counter;
- counter = 0;
- *output++ = (unsigned char)accum;
- }
- counter++;
- accum++;
- } else {
- *output++ = (unsigned char)accum;
- counter = 1;
- accum++;
- penActive = 1;
- }
- } else {
- if (penActive) {
- *output++ = (unsigned char)counter;
- counter = 1;
- accum++;
- penActive = 0;
- } else {
- counter++;
- accum++;
- }
- }
- }
-
- if (penActive) {
- *output++ = (unsigned char)counter;
- }
- penActive = 0;
- counter = 0;
- }
-
- return b;
-}
-
-static void rleDistributeStreaks(RLEBitmap *bitmap) {
- int scanline, halfW = bitmap->w >> 1;
- unsigned char *ptr, tmp;
-
- ptr = bitmap->scans;
- for (scanline = 0; scanline < bitmap->h; scanline++) {
- if (ptr[0] >= halfW) {
- tmp = ptr[0];
- ptr[0] = ptr[6];
- ptr[6] = tmp;
- tmp = ptr[1];
- ptr[1] = ptr[7];
- ptr[7] = tmp;
- }
-
- ptr += 8;
- }
-}
-
-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++) {
- if (*a == 0) {
- *output++ = *b++;
- a++;
- } else {
- if (*b == 0) {
- *output++ = *a++;
- b++;
- } else {
- *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;
- int scaleXFixed;
- static unsigned char scan[512];
-
- /*int blitW = (int)(bitmap->w * scaleX + 0.5f);*/
- int blitH = (int)(bitmap->h * scaleY + 0.5f);
-
- /* From this point on, scaleY will be inverted */
- scaleY = 1.0f / scaleY;
-
- scaleXFixed = (int)(scaleX * (float)(1 << RLE_FIXED_BITS) + 0.5f);
-
- dst += blitX + blitY * dstStride;
-
- for (scanline = blitY; scanline < blitY + blitH; scanline++) {
- float normalScan = scanlineCounter * scaleY; /* ScaleY is inverted */
- 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 = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
- streakLength = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
-
- 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;
- int scaleXFixed;
- static unsigned char scan[512];
-
- /*int blitW = (int)(bitmap->w * scaleX + 0.5f);*/
- int blitH = (int)(bitmap->h * scaleY + 0.5f);
-
- /* From this point on, scaleY will be inverted */
- scaleY = 1.0f / scaleY;
-
- scaleXFixed = (int)(scaleX * (float)(1 << RLE_FIXED_BITS) + 0.5f);
-
- dst += blitX + blitY * dstStride;
-
- for (scanline = blitY; scanline > blitY - blitH; scanline--) {
- float normalScan = scanlineCounter * scaleY; /* ScaleY is inverted */
- 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 = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
- streakLength = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
-
- 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;
- }
-}
-
-/* -------------------------------------------------------------------------------------------------
-* PROPELLER STUFF
-* -------------------------------------------------------------------------------------------------
-*/
#define PROPELLER_CIRCLE_RADIUS 18
#define PROPELLER_CIRCLE_RADIUS_SQ (PROPELLER_CIRCLE_RADIUS * PROPELLER_CIRCLE_RADIUS)
/* First circle */
cx = propellerState.circleX[0] - i;
cy = propellerState.circleY[0] - j;
- if (cx*cx + cy*cy < PROPELLER_CIRCLE_RADIUS_SQ) count++;
+ if (cx * cx + cy * cy < PROPELLER_CIRCLE_RADIUS_SQ)
+ count++;
/* 2nd circle */
cx = propellerState.circleX[1] - i;
cy = propellerState.circleY[1] - j;
- if (cx*cx + cy*cy < PROPELLER_CIRCLE_RADIUS_SQ) count++;
+ if (cx * cx + cy * cy < PROPELLER_CIRCLE_RADIUS_SQ)
+ count++;
/* 3rd circle */
cx = propellerState.circleX[2] - i;
cy = propellerState.circleY[2] - j;
- if (cx*cx + cy*cy < PROPELLER_CIRCLE_RADIUS_SQ) count++;
+ if (cx * cx + cy * cy < PROPELLER_CIRCLE_RADIUS_SQ)
+ count++;
*dst++ = count >= 2;
}
--- /dev/null
+#include "RleBitmap.h"
+#include <malloc.h>
+#include <string.h>
+
+/* Number of numbers per scanline. Each streak has 2 numbers (start, length) */
+#define RLE_ELEMENTS_PER_SCANLINE RLE_STREAKS_PER_SCANLINE * 2
+
+/* Two RLE_TYPE elements per streak (= start,length) */
+#define RLE_BYTES_PER_SCANLINE RLE_ELEMENTS_PER_SCANLINE * sizeof(RLE_TYPE)
+
+/* RLE_TYPE count required for storing an RLE of w,h */
+static int rleWorstCaseElementCount(int w, int h) {
+ /* Allocate an extra worst case for one scanline, which is w/2 streaks = w
+ * (start,length) elements */
+ return h * RLE_ELEMENTS_PER_SCANLINE + w;
+}
+
+/* Byte count of the 'scans' buffer */
+static int rleScansByteCount(RleBitmap *rle) {
+ return rleWorstCaseElementCount(rle->w, rle->h) * sizeof(RLE_TYPE);
+}
+
+RleBitmap *rleCreate(unsigned int w, unsigned int h) {
+ RleBitmap *ret = (RleBitmap *)malloc(sizeof(RleBitmap));
+ ret->w = w;
+ ret->h = h;
+
+ /* Allocate scans */
+ ret->scans = (RLE_TYPE *)calloc(rleWorstCaseElementCount(w, h), sizeof(RLE_TYPE));
+
+ return ret;
+}
+
+void rleDestroy(RleBitmap *b) {
+ if (!b)
+ return;
+ free(b->scans);
+ free(b);
+}
+
+void rleClear(RleBitmap *rle) { memset(rle->scans, 0, rleScansByteCount(rle)); }
+
+RleBitmap *rleEncode(RleBitmap *rle, unsigned char *pixels, unsigned int pixelsW,
+ unsigned int pixelsH) {
+ int x = 0;
+ int y = 0;
+ int streakActive = 0;
+ int currentStreakLength = 0;
+ RLE_TYPE *output = 0;
+ unsigned char *currentInputPixel = pixels;
+
+ /* https://www.youtube.com/watch?v=RKMR02o1I88&feature=youtu.be&t=55 */
+ if (!rle)
+ rle = rleCreate(pixelsW, pixelsH);
+ else
+ rleClear(rle); /* The following code assumes cleared array */
+
+ for (y = 0; y < pixelsH; y++) {
+ /* Go to the beginning of the RLE scan */
+ output = rle->scans + y * RLE_ELEMENTS_PER_SCANLINE;
+
+ for (x = 0; x < pixelsW; x++) {
+ if (*currentInputPixel++) {
+ if (streakActive) {
+ if (currentStreakLength >= RLE_MAX_STREAK_LENGTH) {
+ /* Do not allow streaks of more than max length -
+ * close current streak */
+ *output++ = (RLE_TYPE)currentStreakLength;
+
+ /* Begin new streak at current x */
+ *output++ = (RLE_TYPE)x;
+ currentStreakLength = 0;
+ }
+ } else {
+ /* Begin new streak */
+ *output++ = (RLE_TYPE)x;
+ currentStreakLength = 0;
+ streakActive = 1;
+ }
+ currentStreakLength++;
+ } else {
+ if (streakActive) {
+ /* Close current streak */
+ *output++ = (RLE_TYPE)currentStreakLength;
+ currentStreakLength = 0;
+ streakActive = 0;
+ }
+ } /* End if (current pixel on) */
+ } /* End for (all x) */
+
+ /* We reached the end of the scan - close any active streak */
+ if (streakActive) {
+ *output++ = (RLE_TYPE)currentStreakLength;
+ }
+ streakActive = 0;
+ currentStreakLength = 0;
+ } /* End for (all scans */
+
+ return rle;
+}
+
+void rleDistributeStreaks(RleBitmap *rle) {
+ int scanline = 0;
+ int halfW = rle->w >> 1;
+ RLE_TYPE *ptr = 0;
+ RLE_TYPE tmp = 0;
+
+#define LAST_STREAK RLE_STREAKS_PER_SCANLINE
+
+ ptr = rle->scans;
+ for (scanline = 0; scanline < rle->h; scanline++) {
+ if (ptr[0] >= halfW) {
+ /* Exchange first with last streak */
+ tmp = ptr[0];
+ ptr[0] = ptr[LAST_STREAK * 2 - 2];
+ ptr[LAST_STREAK * 2 - 2] = tmp;
+ tmp = ptr[1];
+ ptr[1] = ptr[LAST_STREAK * 2 - 1];
+ ptr[LAST_STREAK * 2 - 1] = tmp;
+ }
+
+ ptr += 8;
+ }
+}
+
+void rleBlit(RleBitmap *rle, unsigned short *dst, int dstW, int dstH, int dstStride, int blitX,
+ int blitY) {
+ int scanline = 0;
+ int streakPos = 0;
+ int streakLength = 0;
+ int streak = 0;
+ RLE_TYPE *input = rle->scans;
+ unsigned short *output;
+ unsigned int *output32;
+
+ dst += blitX + blitY * dstStride;
+
+ for (scanline = blitY; scanline < blitY + rle->h; scanline++) {
+ if (scanline < 0 || scanline >= dstH)
+ continue;
+ for (streak = 0; streak < RLE_STREAKS_PER_SCANLINE; streak++) {
+ streakPos = (int)*input++;
+ streakLength = (int)*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;
+ }
+}
+
+/* This is madness. We could at least check that we are not interpolating from 0 -> something
+ * (length). This could remove the need for 'distributeScans' */
+void interpolateScan(RLE_TYPE *output, RLE_TYPE *a, RLE_TYPE *b, float t) {
+ static int div = 1 << 23;
+ int ti, i;
+
+ t += 1.0f;
+ ti = (*((unsigned int *)&t)) & 0x7FFFFF;
+
+ for (i = 0; i < RLE_ELEMENTS_PER_SCANLINE; i++) {
+ if (*a == 0) {
+ *output++ = *b++;
+ a++;
+ } else {
+ if (*b == 0) {
+ *output++ = *a++;
+ b++;
+ } else {
+ *output++ = ((*b++ * ti) + (*a++ * (div - ti))) >> 23;
+ }
+ }
+ }
+}
+
+void rleBlitScale(RleBitmap *rle, unsigned short *dst, int dstW, int dstH, int dstStride, 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;
+ int scaleXFixed;
+ static unsigned char scan[512];
+
+ /*int blitW = (int)(rle->w * scaleX + 0.5f);*/
+ int blitH = (int)(rle->h * scaleY + 0.5f);
+
+ /* From this point on, scaleY will be inverted */
+ scaleY = 1.0f / scaleY;
+
+ scaleXFixed = (int)(scaleX * (float)(1 << RLE_FIXED_BITS) + 0.5f);
+
+ dst += blitX + blitY * dstStride;
+
+ for (scanline = blitY; scanline < blitY + blitH; scanline++) {
+ float normalScan = scanlineCounter * scaleY; /* ScaleY is inverted */
+ unsigned char *scan0 = rle->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 = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
+ streakLength = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
+
+ 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;
+ }
+}
+
+void rleBlitScaleInv(RleBitmap *rle, unsigned short *dst, int dstW, int dstH, int dstStride,
+ 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;
+ int scaleXFixed;
+ static unsigned char scan[512];
+
+ /*int blitW = (int)(rle->w * scaleX + 0.5f);*/
+ int blitH = (int)(rle->h * scaleY + 0.5f);
+
+ /* From this point on, scaleY will be inverted */
+ scaleY = 1.0f / scaleY;
+
+ scaleXFixed = (int)(scaleX * (float)(1 << RLE_FIXED_BITS) + 0.5f);
+
+ dst += blitX + blitY * dstStride;
+
+ for (scanline = blitY; scanline > blitY - blitH; scanline--) {
+ float normalScan = scanlineCounter * scaleY; /* ScaleY is inverted */
+ unsigned char *scan0 = rle->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 = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
+ streakLength = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
+
+ 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;
+ }
+}
projects / dosdemo / commitdiff