#define PIXEL_PADDING 32
/* Make sure this is less than PIXEL_PADDING*/
-#define MAX_DISPLACEMENT 16
+#define MAX_DISPLACEMENT 16
#define MIN_SCROLL PIXEL_PADDING
#define MAX_SCROLL (backgroundW - fb_width - MIN_SCROLL)
int tmpBitmapW, tmpBitmapH;
/* Allocate back buffer */
- backBuffer = (unsigned short*) malloc(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))) {
{
}
+
+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)
{
int scroll = MIN_SCROLL + (MAX_SCROLL - MIN_SCROLL) * mouse_x / fb_width;
lastFrameDuration = (time_msec - lastFrameTime) / 1000.0f;
lastFrameTime = time_msec;
+ /* Update mini-effects here */
+ updateWheel(time_msec / 1000.0f);
+
/* First, render the horizon */
for (scanline = 0; scanline < HORIZON_HEIGHT; scanline++) {
memcpy(dst, src, fb_width * 2);
/* 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);
+ }
+ }
+
/* Blit effect to framebuffer */
src = backBuffer + PIXEL_PADDING;
- dst = fb_pixels;
+ dst = vmem_back;
for (scanline = 0; scanline < fb_height; scanline++) {
memcpy(dst, src, fb_width * 2);
src += BB_SIZE;
dst += fb_width;
}
- swap_buffers(fb_pixels);
+ swap_buffers(0);
}
/* src and dst can be the same */
#define RLE_FILL_COLOR 0
#define RLE_FILL_COLOR_32 ((RLE_FILL_COLOR << 16) | RLE_FILL_COLOR)
+#define RLE_FIXED_BITS 16
+
static RLEBitmap rleCreate(unsigned int w, unsigned int h) {
RLEBitmap ret;
ret.w = w;
ti = (*((unsigned int*)&t)) & 0x7FFFFF;
for (i = 0; i < RLE_BYTES_PER_SCANLINE; i++) {
- *output++ = ((*b++ * ti) + (*a++ * (div - ti))) >> 23;
+ if (*a == 0) {
+ *output++ = *b++;
+ a++;
+ } else {
+ if (*b == 0) {
+ *output++ = *a++;
+ b++;
+ } else {
+ *output++ = ((*b++ * ti) + (*a++ * (div - ti))) >> 23;
+ }
+ }
}
}
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;
+
+ int 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;
+ 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;
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);
+ streakPos = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
+ streakLength = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
if ((streakPos + blitX) <= 0) continue;
}
}
+
+
static void rleBlitScaleInv(unsigned short *dst, int dstW, int dstH, int dstStride,
RLEBitmap bitmap, int blitX, int blitY, float scaleX, float scaleY)
{
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;
+
+ int 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;
+ 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;
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);
+ streakPos = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
+ streakLength = (*input++ * scaleXFixed) >> RLE_FIXED_BITS;
if ((streakPos + blitX) <= 0) continue;
dst -= dstStride;
}
- }
+ }