From: Michael Georgoulopoulos Date: Sun, 18 Sep 2016 21:47:27 +0000 (+0300) Subject: Use pointers instead of structs to handle rleBitmap objects X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=commitdiff_plain;h=7fc67193bb83e0bf6fc1583d6aa50e5ea987ab5a Use pointers instead of structs to handle rleBitmap objects --- diff --git a/src/grise.c b/src/grise.c index ed15de0..f354181 100644 --- a/src/grise.c +++ b/src/grise.c @@ -14,15 +14,17 @@ typedef struct { 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" @@ -76,7 +78,9 @@ static int scrollTableRounded[REFLECTION_HEIGHT]; static int scrollModTable[REFLECTION_HEIGHT]; static float nearScrollAmount = 0.0f; -static RLEBitmap grobj; +static char miniFXBuffer[1024]; + +static RLEBitmap *grobj = 0; static struct screen scr = { "galaxyrise", @@ -116,7 +120,7 @@ static int init(void) return -1; } - grobj = rleEncode(tmpBitmap, tmpBitmapW, tmpBitmapH); + grobj = rleEncode(0, tmpBitmap, tmpBitmapW, tmpBitmapH); img_free_pixels(tmpBitmap); @@ -151,71 +155,7 @@ static void stop(long trans_time) } -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) { @@ -231,7 +171,7 @@ static void draw(void) lastFrameTime = time_msec; /* Update mini-effects here */ - updateWheel(time_msec / 1000.0f); + updatePropeller(time_msec / 1000.0f); /* First, render the horizon */ for (scanline = 0; scanline < HORIZON_HEIGHT; scanline++) { @@ -276,7 +216,7 @@ static void draw(void) for (scanline = 0; scanline < 32; scanline++) { for (i = 0; i < 32; i++) { - backBuffer[PIXEL_PADDING + scanline * BB_SIZE + i] = wheel(i, scanline); + backBuffer[PIXEL_PADDING + scanline * BB_SIZE + i] = miniFXBuffer[i + 32 * scanline] ? 0xFFFF : 0x0000; } } @@ -394,35 +334,36 @@ static void updateScrollTables(float dt) { #define RLE_FIXED_BITS 16 -static RLEBitmap rleCreate(unsigned int w, unsigned int h) { - RLEBitmap ret; - ret.w = w; - ret.h = h; +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(h * RLE_BYTES_PER_SCANLINE + w, 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); 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++) { @@ -460,23 +401,23 @@ static RLEBitmap rleEncode(unsigned char *pixels, unsigned int w, unsigned int h counter = 0; } - return ret; + return 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) { 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++; @@ -526,7 +467,7 @@ static void interpolateScan(unsigned char *output, unsigned char *a, unsigned ch } 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; @@ -538,8 +479,8 @@ static void rleBlitScale(unsigned short *dst, int dstW, int dstH, int dstStride, 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; @@ -550,7 +491,7 @@ static void rleBlitScale(unsigned short *dst, int dstW, int dstH, int 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 *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); @@ -586,7 +527,7 @@ static void rleBlitScale(unsigned short *dst, int dstW, int dstH, int dstStride, 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; @@ -598,8 +539,8 @@ static void rleBlitScaleInv(unsigned short *dst, int dstW, int dstH, int dstStri 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; @@ -610,7 +551,7 @@ static void rleBlitScaleInv(unsigned short *dst, int dstW, int dstH, int dstStri 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); @@ -642,3 +583,79 @@ static void rleBlitScaleInv(unsigned short *dst, int dstW, int dstH, int dstStri 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; + } + } +}