Agrego transparencia a las bolsas que desparecen.
Félix Arreola Rodríguez
parent
2db613871d
commit
e0ab125eda
39
src/beans.c
39
src/beans.c
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@ -379,6 +379,7 @@ void setup (void);
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SDL_Surface * set_video_mode(unsigned flags);
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void setup_and_color_penguin (void);
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void add_bag (int tipo);
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void delete_bag (BeanBag *p);
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/* Variables globales */
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SDL_Surface * screen;
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@ -526,11 +527,11 @@ int game_loop (void) {
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Uint32 last_time, now_time;
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SDL_Rect rect;
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int penguinx, handposx;
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BeanBag *thisbag;
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BeanBag *thisbag, *nextbag;
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int bags = 0;
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int penguin_frame = 0;
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int i;
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int i, j;
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/* Predibujar todo */
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/*SDL_FillRect (screen, NULL, 0);
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@ -598,9 +599,17 @@ int game_loop (void) {
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/* Procesar las bolsas */
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thisbag = first_bag;
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while (thisbag != NULL) {
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nextbag = thisbag->next;
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thisbag->frame++;
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thisbag = thisbag->next;
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j = thisbag->frame - thisbag->throw_length;
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if (j >= 35) {
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/* Eliminar esta bolsa */
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delete_bag (thisbag);
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}
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thisbag = nextbag;
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}
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SDL_BlitSurface (images[IMG_BACKGROUND], NULL, screen, NULL);
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@ -655,12 +664,17 @@ int game_loop (void) {
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i = IMG_BAG_4;
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rect.x = thisbag->bag_points[thisbag->throw_length][1];
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rect.y = thisbag->bag_points[thisbag->throw_length][2];
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j = thisbag->frame - thisbag->throw_length;
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}
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rect.w = images[i]->w;
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rect.h = images[i]->h;
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SDL_BlitSurface (images[i], NULL, screen, &rect);
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if (i == IMG_BAG_4 && j > 25) {
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SDL_gfxBlitRGBAWithAlpha (images[i], NULL, screen, &rect, 255 - SDL_ALPHA_OPAQUE * (j - 25) / 10);
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} else {
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SDL_BlitSurface (images[i], NULL, screen, &rect);
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}
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thisbag = thisbag->next;
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}
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@ -989,3 +1003,20 @@ void add_bag (int tipo) {
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}
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}
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void delete_bag (BeanBag *p) {
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if (p == NULL) return;
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if (p->prev == NULL) { /* El primero de la lista */
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first_bag = p->next;
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} else {
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p->prev->next = p->next;
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}
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if (p->next == NULL) {
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last_bag = p->prev;
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} else {
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p->next->prev = p->prev;
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}
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free (p);
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}
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@ -41,6 +41,13 @@ b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \
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a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \
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}
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#define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \
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{ \
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r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \
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g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \
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b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \
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}
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/*!
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\brief Disassemble buffer pointer into a pixel and separate RGBA values.
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*/
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@ -51,6 +58,34 @@ GFX_RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \
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pixel &= ~fmt->Amask; \
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} while(0)
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#define GFX_DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \
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do { \
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switch (bpp) { \
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case 2: \
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Pixel = *((Uint16 *)(buf)); \
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break; \
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\
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case 3: { \
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Uint8 *B = (Uint8 *)buf; \
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if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
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} else { \
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Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
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} \
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} \
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break; \
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\
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case 4: \
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Pixel = *((Uint32 *)(buf)); \
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break; \
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\
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default: \
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Pixel = 0; /* prevent gcc from complaining */ \
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break; \
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} \
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RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
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} while(0)
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/*!
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\brief Wrap a pixel from RGBA values using mask, shift and loss for surface.
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*/
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@ -67,10 +102,36 @@ pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
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*/
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#define GFX_ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \
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{ \
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Uint32 pixel; \
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\
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GFX_PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \
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*((Uint32 *)(buf)) = pixel; \
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switch (bpp) { \
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case 2: { \
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Uint16 Pixel; \
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\
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GFX_PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \
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*((Uint16 *)(buf)) = Pixel; \
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} \
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break; \
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\
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case 3: { /* FIXME: broken code (no alpha) */ \
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if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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*((buf)+fmt->Rshift/8) = r; \
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*((buf)+fmt->Gshift/8) = g; \
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*((buf)+fmt->Bshift/8) = b; \
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} else { \
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*((buf)+2-fmt->Rshift/8) = r; \
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*((buf)+2-fmt->Gshift/8) = g; \
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*((buf)+2-fmt->Bshift/8) = b; \
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} \
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} \
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break; \
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\
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case 4: { \
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Uint32 Pixel; \
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\
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GFX_PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \
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*((Uint32 *)(buf)) = Pixel; \
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} \
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break; \
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} \
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}
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/*!
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@ -83,18 +144,6 @@ dG = (((sG-dG)*(A))/255)+dG; \
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dB = (((sB-dB)*(A))/255)+dB; \
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} while(0)
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#define PERFECT_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB, dA) \
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do { \
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dR = ((sR * sA) + (dR * dA * (255 - sA))); \
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dG = ((sG * sA) + (dG * dA * (255 - sA))); \
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dB = ((sB * sA) + (dB * dA * (255 - sA))); \
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dA = (sA + (dA * (255 - sA))); \
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dR = dR / dA; \
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dG = dG / dA; \
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dB = dB / dA; \
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dA = (dA / 255); \
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} while (0)
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/*!
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\brief 4-times unrolled DUFFs loop.
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@ -124,6 +173,7 @@ typedef struct {
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SDL_PixelFormat *src;
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Uint8 *table;
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SDL_PixelFormat *dst;
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Uint8 alpha;
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} SDL_gfxBlitInfo;
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/*!
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@ -607,3 +657,206 @@ int SDL_gfxBlitRGBA(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SD
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return 0;
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}
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/* Funciones escritas por Gatuno para hacer Blit con superficies transparentes más un alpha general */
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/* General (slow) N->N blending with per-surface alpha */
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static void _SDL_gfxBlitBlitterRGBAWithAlpha(SDL_gfxBlitInfo *info)
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{
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int width = info->d_width;
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int height = info->d_height;
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Uint8 *src = info->s_pixels;
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int srcskip = info->s_skip;
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Uint8 *dst = info->d_pixels;
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int dstskip = info->d_skip;
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SDL_PixelFormat *srcfmt = info->src;
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SDL_PixelFormat *dstfmt = info->dst;
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int srcbpp = srcfmt->BytesPerPixel;
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int dstbpp = dstfmt->BytesPerPixel;
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unsigned sAlpha = info->alpha;
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unsigned dA = dstfmt->Amask ? SDL_ALPHA_OPAQUE : 0;
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if(sAlpha) {
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while ( height-- ) {
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GFX_DUFFS_LOOP4( {
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Uint32 Pixel;
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unsigned sR;
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unsigned sG;
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unsigned sB;
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unsigned dR;
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unsigned dG;
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unsigned dB;
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unsigned sA;
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GFX_DISASSEMBLE_RGBA(src, srcbpp, srcfmt, Pixel, sR, sG, sB, sA);
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GFX_DISEMBLE_RGB(dst, dstbpp, dstfmt, Pixel, dR, dG, dB);
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sA = sA * sAlpha / 255;
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GFX_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB);
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GFX_ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
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src += srcbpp;
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dst += dstbpp;
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},
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width);
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src += srcskip;
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dst += dstskip;
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}
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}
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}
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int _SDL_gfxBlitRGBACallWithAlpha(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect, Uint8 alpha)
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{
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/*
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* Set up source and destination buffer pointers, then blit
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*/
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if (srcrect->w && srcrect->h) {
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SDL_gfxBlitInfo info;
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/*
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* Set up the blit information
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*/
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#if (SDL_MINOR_VERSION == 3)
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info.s_pixels = (Uint8 *) src->pixels + (Uint16) srcrect->y * src->pitch + (Uint16) srcrect->x * src->format->BytesPerPixel;
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#else
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info.s_pixels = (Uint8 *) src->pixels + src->offset + (Uint16) srcrect->y * src->pitch + (Uint16) srcrect->x * src->format->BytesPerPixel;
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#endif
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info.s_width = srcrect->w;
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info.s_height = srcrect->h;
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info.s_skip = (int)(src->pitch - info.s_width * src->format->BytesPerPixel);
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#if (SDL_MINOR_VERSION == 3)
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info.d_pixels = (Uint8 *) dst->pixels + (Uint16) dstrect->y * dst->pitch + (Uint16) dstrect->x * dst->format->BytesPerPixel;
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#else
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info.d_pixels = (Uint8 *) dst->pixels + dst->offset + (Uint16) dstrect->y * dst->pitch + (Uint16) dstrect->x * dst->format->BytesPerPixel;
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#endif
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info.d_width = dstrect->w;
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info.d_height = dstrect->h;
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info.d_skip = (int)(dst->pitch - info.d_width * dst->format->BytesPerPixel);
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info.aux_data = NULL;
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info.src = src->format;
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info.table = NULL;
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info.dst = dst->format;
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info.alpha = alpha;
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/*
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* Run the actual software blitter
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*/
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_SDL_gfxBlitBlitterRGBAWithAlpha(&info);
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return 1;
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}
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return (0);
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}
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/*!
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\brief Blitter for RGBA->RGBA blits with alpha per surface.
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Verifies the input 'src' and 'dst' surfaces and rectangles and performs blit.
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The destination clip rectangle is honored.
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\param src The source surface.
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\param srcrect The source rectangle.
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\param dst The destination surface.
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\param dstrect The destination rectangle.
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\returns Returns 1 if blit was performed, 0 otherwise, or -1 if an error occured.
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*/
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int SDL_gfxBlitRGBAWithAlpha(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect, Uint8 alpha)
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{
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SDL_Rect sr, dr;
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int srcx, srcy, w, h;
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/*
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* Make sure the surfaces aren't locked
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*/
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if (!src || !dst) {
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SDL_SetError("SDL_UpperBlit: passed a NULL surface");
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return (-1);
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}
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if ((src->locked) || (dst->locked)) {
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SDL_SetError("Surfaces must not be locked during blit");
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return (-1);
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}
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if (alpha == 0) {
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return 0;
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}
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/*
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* If the destination rectangle is NULL, use the entire dest surface
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*/
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if (dstrect == NULL) {
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dr.x = dr.y = 0;
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dr.w = dst->w;
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dr.h = dst->h;
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} else {
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dr = *dstrect;
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}
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/*
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* Clip the source rectangle to the source surface
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*/
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if (srcrect) {
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int maxw, maxh;
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srcx = srcrect->x;
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w = srcrect->w;
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if (srcx < 0) {
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w += srcx;
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dr.x -= srcx;
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srcx = 0;
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}
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maxw = src->w - srcx;
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if (maxw < w)
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w = maxw;
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srcy = srcrect->y;
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h = srcrect->h;
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if (srcy < 0) {
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h += srcy;
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dr.y -= srcy;
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srcy = 0;
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}
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maxh = src->h - srcy;
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if (maxh < h)
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h = maxh;
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} else {
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srcx = srcy = 0;
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w = src->w;
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h = src->h;
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}
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/*
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* Clip the destination rectangle against the clip rectangle
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*/
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{
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SDL_Rect *clip = &dst->clip_rect;
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int dx, dy;
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dx = clip->x - dr.x;
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if (dx > 0) {
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w -= dx;
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dr.x += dx;
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srcx += dx;
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}
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dx = dr.x + w - clip->x - clip->w;
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if (dx > 0)
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w -= dx;
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dy = clip->y - dr.y;
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if (dy > 0) {
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h -= dy;
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dr.y += dy;
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srcy += dy;
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}
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dy = dr.y + h - clip->y - clip->h;
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if (dy > 0)
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h -= dy;
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}
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if (w > 0 && h > 0) {
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sr.x = srcx;
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sr.y = srcy;
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sr.w = dr.w = w;
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sr.h = dr.h = h;
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return (_SDL_gfxBlitRGBACallWithAlpha(src, &sr, dst, &dr, alpha));
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}
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return 0;
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}
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@ -24,6 +24,7 @@
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#define __GFX_BLIT_FUNC_H__
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int SDL_gfxBlitRGBA(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect);
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int SDL_gfxBlitRGBAWithAlpha(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect, Uint8 alpha);
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#endif /* __GFX_BLIT_FUNC_H__ */
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