-#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 */
-
-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);
-
-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 */
-
-/* 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 15.0f
-#define NEAR_SCROLL_SPEED 120.0f
-
-#define HORIZON_HEIGHT 100
-#define REFLECTION_HEIGHT (240 - HORIZON_HEIGHT)
-
-#define NORMALMAP_SCANLINE 372
-
-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 convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount);
-static void processNormal();
-static void initScrollTables();
-static void updateScrollTables(float dt);
-
-
-
-static unsigned short *background = 0;
-static int backgroundW = 0;
-static int backgroundH = 0;
-
-static unsigned int lastFrameTime = 0;
-static float lastFrameDuration = 0.0f;
-
-static short *displacementMap;
-
-static unsigned short *backBuffer;
-
-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 unsigned char miniFXBuffer[1024];
-
-static RLEBitmap *grobj = 0;
-static RLEBitmap *rlePropeller = 0;
-
-static struct screen scr = {
- "galaxyrise",
- init,
- destroy,
- start,
- 0,
- draw
-};
-
-struct screen *grise_screen(void)
-{
- return &scr;
-}
-
-static int init(void)
-{
- unsigned char *tmpBitmap;
- int tmpBitmapW, tmpBitmapH;
-
- /* Allocate back buffer */
- 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))) {
- 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 */
-
- /* Load reflected objects */
- 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;
- }
-
- grobj = rleEncode(0, tmpBitmap, tmpBitmapW, tmpBitmapH);
-
- img_free_pixels(tmpBitmap);
-
- initScrollTables();
-
- processNormal();
-
- return 0;
-}
-
-static void destroy(void)
-{
- free(backBuffer);
- backBuffer = 0;
-
- img_free_pixels(background);
-
- rleDestroy(grobj);
-}
-
-static void start(long trans_time)
-{
- lastFrameTime = time_msec;
-}
-
-
-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;
- int scanline = 0;
- int i = 0;
- short *dispScanline;
- int d;
- int accum = 0;
- int md, sc;
- int scrolledIndex;
-
- lastFrameDuration = (time_msec - lastFrameTime) / 1000.0f;
- lastFrameTime = time_msec;
-
- /* Update mini-effects here */
- updatePropeller(4.0f * time_msec / 1000.0f);
-
- /* First, render the horizon */
- for (scanline = 0; scanline < HORIZON_HEIGHT; scanline++) {
- memcpy(dst, src, fb_width * 2);
- src += backgroundW;
- dst += BB_SIZE;
- }
-
- /* Create scroll offsets for all scanlines of the normalmap */
- updateScrollTables(lastFrameDuration);
-
- /* Render the baked reflection one scanline below its place, so that
- * the displacement that follows will be done in a cache-friendly way
- */
- src -= PIXEL_PADDING; /* We want to also fill the PADDING pixels here */
- dst = backBuffer + (HORIZON_HEIGHT + 1) * BB_SIZE;
- for (scanline = 0; scanline < REFLECTION_HEIGHT; scanline++) {
- memcpy(dst, src, (fb_width + PIXEL_PADDING) * 2);
- 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, rlePropeller, 134 + (i-3) * 60, 200, 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 = displacementMap;
- for (scanline = 0; scanline < REFLECTION_HEIGHT; scanline++) {
-
- md = scrollModTable[scanline];
- sc = scrollTableRounded[scanline];
- accum = 0;
-
- for (i = 0; i < fb_width; i++) {
- /* Try to immitate modulo without the division */
- if (i == md) accum += md;
- scrolledIndex = i - accum + sc;
- if (scrolledIndex >= md) scrolledIndex -= md;
-
- /* Displace */
- d = dispScanline[scrolledIndex];
- *dst++ = src[i + d];
- }
- src += backgroundW;
- dst += BB_SIZE - fb_width;
- dispScanline += backgroundW;
- }
-
- /* 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);
-
- /* 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;
- dst += fb_width;
- }
-
- swap_buffers(0);
-}
-
-/* src and dst can be the same */
-static void convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount) {
- unsigned int p;
- while (pixelCount) {
- p = *src32++;
- *dst16++ = ((p << 8) & 0xF800) /* R */
- | ((p >> 5) & 0x07E0) /* G */
- | ((p >> 19) & 0x001F); /* B */
- pixelCount--;
- }
-}
-
-/* Normal map preprocessing */
-/* Scale normal with depth and unpack R component (horizontal component) */
-static void processNormal() {
- int scanline;
- 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++) {
- 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);
- } else {
- *dst = 0;
- }
- dst++;
- }
- normalmap += backgroundW;
- }
-
- if (maxDisplacement == minDisplacement) {
- printf("Warning: grise normalmap fucked up\n");
- return;
- }
-
- /* 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*/
- 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;
- for (i = 0; i < REFLECTION_HEIGHT; i++) {
- 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] = nearScrollAmount / scrollScaleTable[i];
- scrollTableRounded[i] = (int)(scrollTable[i] + 0.5f) % scrollModTable[i];
- }
-}
-
-/* -------------------------------------------------------------------------------------------------
- * RLE 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)
-
-static struct {
- int circleX[3];
- int circleY[3];
-} propellerState;
-
-static void updatePropeller(float t) {
- 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 */
- rlePropeller = rleEncode(rlePropeller, miniFXBuffer, 32, 32);
-
- /* Distribute the produced streaks so that they don't produce garbage when interpolated */
- rleDistributeStreaks(rlePropeller);
-}
projects / dosdemo / commitdiff