unsigned char *scans;
} RLEBitmap;
-static RLEBitmap rleCreate(unsigned int w, unsigned int h);
-static void rleDestroy(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);
+ 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);
+ 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);
+ RLEBitmap *bitmap, int blitX, int blitY, float scaleX, float scaleY);
+static RLEBitmap *rleEncode(RLEBitmap *b, unsigned char *pixels, unsigned int w, unsigned int h);
+
+static void updatePropeller(float t);
#define BG_FILENAME "data/grise.png"
#define GROBJ_01_FILENAME "data/grobj_01.png"
static int scrollModTable[REFLECTION_HEIGHT];
static float nearScrollAmount = 0.0f;
-static RLEBitmap grobj;
+static char miniFXBuffer[1024];
+
+static RLEBitmap *grobj = 0;
+static RLEBitmap *rlePropeller = 0;
static struct screen scr = {
"galaxyrise",
return -1;
}
- grobj = rleEncode(tmpBitmap, tmpBitmapW, tmpBitmapH);
+ grobj = rleEncode(0, tmpBitmap, tmpBitmapW, tmpBitmapH);
img_free_pixels(tmpBitmap);
}
-struct {
- int circleX[3];
- int circleY[3];
-} wheelState;
-
-static void updateWheel(float t) {
- 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;
- wheelState.circleX[0] = (int)(x + 0.5f) + 16;
- wheelState.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;
- wheelState.circleX[1] = (int)(x + 0.5f) + 16;
- wheelState.circleY[1] = (int)(y + 0.5f) + 16;
-
- /* 3rd circle */
- nx = x * cos120 - y * sin120;
- ny = y * cos120 + x * sin120;
- x = nx;
- y = ny;
- wheelState.circleX[2] = (int)(x + 0.5f) + 16;
- wheelState.circleY[2] = (int)(y + 0.5f) + 16;
-}
-
-#define WHEEL_CIRCLE_RADIUS 18
-#define WHEEL_CIRCLE_RADIUS_SQ (WHEEL_CIRCLE_RADIUS * WHEEL_CIRCLE_RADIUS)
-
-static unsigned short wheel(int x, int y) {
- int cx, cy, count=0;
-
- /* First circle */
- cx = wheelState.circleX[0] - x;
- cy = wheelState.circleY[0] - y;
- if (cx*cx + cy*cy < WHEEL_CIRCLE_RADIUS_SQ) count++;
-
- /* 2nd circle */
- cx = wheelState.circleX[1] - x;
- cy = wheelState.circleY[1] - y;
- if (cx*cx + cy*cy < WHEEL_CIRCLE_RADIUS_SQ) count++;
-
- /* 3rd circle */
- cx = wheelState.circleX[2] - x;
- cy = wheelState.circleY[2] - y;
- if (cx*cx + cy*cy < WHEEL_CIRCLE_RADIUS_SQ) count++;
- if (count >= 2) return 0xFFFF;
-
- return 0x000F;
-}
static void draw(void)
{
lastFrameTime = time_msec;
/* Update mini-effects here */
- updateWheel(time_msec / 1000.0f);
+ updatePropeller(4.0f * time_msec / 1000.0f);
/* First, render the horizon */
for (scanline = 0; scanline < HORIZON_HEIGHT; scanline++) {
}
/* 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);
+ 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);
/* Perform displacement */
dst = backBuffer + HORIZON_HEIGHT * BB_SIZE + PIXEL_PADDING;
}
/* 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);
-
- for (scanline = 0; scanline < 32; scanline++) {
- for (i = 0; i < 32; i++) {
- backBuffer[PIXEL_PADDING + scanline * BB_SIZE + i] = wheel(i, scanline);
- }
- }
-
+ for (i = 0; i < 5; i++) rleBlit(backBuffer + PIXEL_PADDING, fb_width, fb_height, BB_SIZE, rlePropeller, 134 + (i-3) * 60, 100);
+
/* Blit effect to framebuffer */
src = backBuffer + PIXEL_PADDING;
dst = vmem_back;
#define RLE_FIXED_BITS 16
-static RLEBitmap rleCreate(unsigned int w, unsigned int h) {
- RLEBitmap ret;
- ret.w = w;
- ret.h = h;
+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(h * RLE_BYTES_PER_SCANLINE + w, 1);
+ ret->scans = (unsigned char*) calloc(rleByteCount(w, h), 1);
return ret;
}
-static void rleDestroy(RLEBitmap b) {
- free(b.scans);
+static void rleDestroy(RLEBitmap *b) {
+ if (!b) return;
+ free(b->scans);
+ free(b);
}
-static RLEBitmap rleEncode(unsigned char *pixels, unsigned int w, unsigned int h) {
+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;
- RLEBitmap ret;
unsigned char *output;
/* https://www.youtube.com/watch?v=RKMR02o1I88&feature=youtu.be&t=55 */
- ret = rleCreate(w, h);
+ 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 = ret.scans + scanline * RLE_BYTES_PER_SCANLINE;
+ output = b->scans + scanline * RLE_BYTES_PER_SCANLINE;
accum = 0;
for (i = 0; i < w; i++) {
if (*pixels++) {
counter = 0;
}
- return ret;
+ 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)
+ RLEBitmap *bitmap, int blitX, int blitY)
{
int scanline = 0;
int streakPos = 0;
int streakLength = 0;
int streak = 0;
- unsigned char *input = bitmap.scans;
+ unsigned char *input = bitmap->scans;
unsigned short *output;
unsigned int *output32;
dst += blitX + blitY * dstStride;
- for (scanline = blitY; scanline < blitY + bitmap.h; scanline++) {
+ 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++;
}
static void rleBlitScale(unsigned short *dst, int dstW, int dstH, int dstStride,
- RLEBitmap bitmap, int blitX, int blitY, float scaleX, float scaleY)
+ RLEBitmap *bitmap, int blitX, int blitY, float scaleX, float scaleY)
{
int scanline = 0;
int streakPos = 0;
int scanlineCounter = 0;
static unsigned char scan[512];
- int blitW = (int) (bitmap.w * scaleX + 0.5f);
- int blitH = (int)(bitmap.h * scaleY + 0.5f);
+ 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;
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 *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);
static void rleBlitScaleInv(unsigned short *dst, int dstW, int dstH, int dstStride,
- RLEBitmap bitmap, int blitX, int blitY, float scaleX, float scaleY)
+ RLEBitmap *bitmap, int blitX, int blitY, float scaleX, float scaleY)
{
int scanline = 0;
int streakPos = 0;
int scanlineCounter = 0;
static unsigned char scan[512];
- int blitW = (int)(bitmap.w * scaleX + 0.5f);
- int blitH = (int)(bitmap.h * scaleY + 0.5f);
+ 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;
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 *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);
dst -= dstStride;
}
}
+
+/* -------------------------------------------------------------------------------------------------
+* PROPELLER STUFF
+* -------------------------------------------------------------------------------------------------
+*/
+
+#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) {
+ int i, j;
+ int cx, cy, count = 0;
+ 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 */
+ rlePropeller = rleEncode(rlePropeller, miniFXBuffer, 32, 32);
+
+ /* Distribute the produced streaks so that they don't produce garbage when interpolated */
+ rleDistributeStreaks(rlePropeller);
+}
projects / dosdemo / commitdiff