amiga_imgv

annotate src/sdl/gfx.c @ 11:3d9aaefb8ba6

find changesets by author, revision, files, or words in the commit message
interlace mode
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 30 Oct 2017 15:24:23 +0200
parents 5614fbb9c1de
children
rev   line source
nuclear@3 1 #include <stdio.h>
nuclear@3 2 #include <SDL/SDL.h>
nuclear@3 3 #include "gfx.h"
nuclear@3 4 #include "image.h"
nuclear@3 5
nuclear@3 6 static SDL_Surface *fbsurf;
nuclear@3 7 static int scr_width, scr_height;
nuclear@3 8 static int fb_width, fb_height;
nuclear@3 9 static int num_bitplanes;
nuclear@7 10 static int init_flags;
nuclear@3 11
nuclear@3 12
nuclear@3 13 int gfx_init(int nbpl, unsigned int flags)
nuclear@3 14 {
nuclear@7 15 init_flags = flags;
nuclear@3 16 num_bitplanes = nbpl;
nuclear@3 17 scr_width = fb_width = (flags & GFX_HIRES) ? 640 : 320;
nuclear@3 18 scr_height = fb_height = (flags & GFX_ILACE) ? 512 : 256;
nuclear@3 19
nuclear@3 20 if(SDL_Init(SDL_INIT_VIDEO) == -1) {
nuclear@3 21 fprintf(stderr, "failed to initialize SDL\n");
nuclear@3 22 return -1;
nuclear@3 23 }
nuclear@3 24 if(!(fbsurf = SDL_SetVideoMode(scr_width, scr_height, 32, SDL_SWSURFACE))) {
nuclear@3 25 fprintf(stderr, "failed to set video mode %dx%d\n", scr_width, scr_height);
nuclear@3 26 SDL_Quit();
nuclear@3 27 return -1;
nuclear@3 28 }
nuclear@4 29 SDL_WM_SetCaption("imgv SDL version", 0);
nuclear@3 30
nuclear@3 31 return 0;
nuclear@3 32 }
nuclear@3 33
nuclear@3 34 void gfx_shutdown(void)
nuclear@3 35 {
nuclear@3 36 SDL_Quit();
nuclear@3 37 }
nuclear@3 38
nuclear@3 39
nuclear@3 40 int gfx_screen_width(void)
nuclear@3 41 {
nuclear@3 42 return scr_width;
nuclear@3 43 }
nuclear@3 44
nuclear@3 45 int gfx_screen_height(void)
nuclear@3 46 {
nuclear@3 47 return scr_height;
nuclear@3 48 }
nuclear@3 49
nuclear@3 50
nuclear@3 51 void *gfx_set_framebuffer(void *fb, int width, int height)
nuclear@3 52 {
nuclear@11 53 fb_width = width;
nuclear@11 54 fb_height = height;
nuclear@10 55 return 0;
nuclear@3 56 }
nuclear@3 57
nuclear@3 58 void *gfx_get_framebuffer(void)
nuclear@3 59 {
nuclear@3 60 return 0;
nuclear@3 61 }
nuclear@3 62
nuclear@3 63
nuclear@3 64 int get_framebuffer_width(void)
nuclear@3 65 {
nuclear@3 66 return fb_width;
nuclear@3 67 }
nuclear@3 68
nuclear@3 69 int get_framebuffer_height(void)
nuclear@3 70 {
nuclear@3 71 return fb_height;
nuclear@3 72 }
nuclear@3 73
nuclear@3 74
nuclear@3 75 void gfx_begin_copperlist(void)
nuclear@3 76 {
nuclear@3 77 }
nuclear@3 78
nuclear@3 79
nuclear@3 80 int gfx_next_event(union gfx_event *ev, int block)
nuclear@3 81 {
nuclear@3 82 SDL_Event sdlev;
nuclear@3 83
nuclear@3 84 if(block) {
nuclear@3 85 SDL_WaitEvent(&sdlev);
nuclear@3 86 } else {
nuclear@3 87 if(!SDL_PollEvent(&sdlev)) {
nuclear@3 88 return 0;
nuclear@3 89 }
nuclear@3 90 }
nuclear@3 91
nuclear@3 92 switch(sdlev.type) {
nuclear@3 93 case SDL_QUIT:
nuclear@3 94 ev->type = GFX_EV_QUIT;
nuclear@3 95 return 1;
nuclear@3 96
nuclear@3 97 case SDL_KEYDOWN:
nuclear@3 98 case SDL_KEYUP:
nuclear@3 99 ev->type = GFX_EV_KEY;
nuclear@3 100 ev->key.key = sdlev.key.keysym.sym;
nuclear@3 101 ev->key.pressed = sdlev.key.state == SDL_PRESSED;
nuclear@3 102 return 1;
nuclear@3 103
nuclear@3 104 default:
nuclear@3 105 break;
nuclear@3 106 }
nuclear@3 107 return 0;
nuclear@3 108 }
nuclear@3 109
nuclear@3 110
nuclear@3 111 void gfx_wait_vpos(int x)
nuclear@3 112 {
nuclear@3 113 }
nuclear@3 114
nuclear@3 115 void gfx_wait_vblank(void)
nuclear@3 116 {
nuclear@3 117 }
nuclear@3 118
nuclear@3 119 #define ARED(x) ((((x) & 0xf00) >> 4) | (((x) & 0xf00) >> 8))
nuclear@3 120 #define AGREEN(x) (((x) & 0xf0) | (((x) & 0xf0) >> 4))
nuclear@3 121 #define ABLUE(x) ((((x) & 0xf) << 4) | ((x) & 0xf))
nuclear@3 122
nuclear@4 123 #define RSHIFT (fbsurf->format->Rshift)
nuclear@4 124 #define GSHIFT (fbsurf->format->Gshift)
nuclear@4 125 #define BSHIFT (fbsurf->format->Bshift)
nuclear@4 126 #define RMASK (fbsurf->format->Rmask)
nuclear@4 127 #define GMASK (fbsurf->format->Gmask)
nuclear@4 128 #define BMASK (fbsurf->format->Bmask)
nuclear@4 129
nuclear@6 130 #define PACKRGB(r, g, b) ((((r) << RSHIFT) & RMASK) | \
nuclear@6 131 (((g) << GSHIFT) & GMASK) | \
nuclear@6 132 (((b) << BSHIFT) & BMASK))
nuclear@6 133
nuclear@3 134 void gfx_show_image(struct ham_image *img)
nuclear@3 135 {
nuclear@11 136 int i, j, k, ncolors;
nuclear@11 137 uint32_t color, palette[256];
nuclear@3 138 uint32_t *dest;
nuclear@3 139 unsigned char *src;
nuclear@6 140 struct palchange *chg = img->chglist;
nuclear@3 141
nuclear@11 142 ncolors = 1 << img->nbitplanes;
nuclear@11 143
nuclear@11 144 for(i=0; i<ncolors; i++) {
nuclear@3 145 uint16_t pcol = img->palette[i];
nuclear@3 146 int red = ARED(pcol);
nuclear@3 147 int green = AGREEN(pcol);
nuclear@3 148 int blue = ABLUE(pcol);
nuclear@6 149 palette[i] = PACKRGB(red, green, blue);
nuclear@3 150 }
nuclear@3 151
nuclear@3 152 if(SDL_MUSTLOCK(fbsurf)) {
nuclear@3 153 SDL_LockSurface(fbsurf);
nuclear@3 154 }
nuclear@3 155
nuclear@3 156 dest = fbsurf->pixels;
nuclear@3 157 src = img->pixels;
nuclear@3 158 for(i=0; i<img->height; i++) {
nuclear@11 159 if(i >= scr_height) break;
nuclear@11 160
nuclear@6 161 while(chg && chg->line <= i) {
nuclear@6 162 int idx = (chg->entry & 0xf000) >> 12;
nuclear@6 163 int red = ARED(chg->entry);
nuclear@6 164 int green = AGREEN(chg->entry);
nuclear@6 165 int blue = ABLUE(chg->entry);
nuclear@6 166 palette[idx] = PACKRGB(red, green, blue);
nuclear@6 167 chg = chg->next;
nuclear@6 168 }
nuclear@6 169
nuclear@3 170 for(j=0; j<img->width; j++) {
nuclear@3 171 unsigned char idx = 0;
nuclear@7 172 unsigned char ham = 0;
nuclear@4 173 int bit = 7 - (j & 7);
nuclear@4 174
nuclear@3 175 for(k=0; k<img->nbitplanes; k++) {
nuclear@5 176 idx |= (((*(src + k * img->width / 8) >> bit) & 1) << k);
nuclear@3 177 }
nuclear@4 178
nuclear@7 179 if(init_flags & GFX_HAM) {
nuclear@7 180 ham = (idx >> 4) & 3;
nuclear@7 181 }
nuclear@4 182
nuclear@4 183 switch(ham) {
nuclear@4 184 case 0:
nuclear@4 185 color = palette[idx];
nuclear@4 186 break;
nuclear@4 187 case 1:
nuclear@6 188 color = (color & ~BMASK) | (((uint32_t)ABLUE(idx)) << BSHIFT);
nuclear@4 189 break;
nuclear@4 190 case 2:
nuclear@6 191 color = (color & ~RMASK) | (((uint32_t)ABLUE(idx)) << RSHIFT);
nuclear@4 192 break;
nuclear@4 193 case 3:
nuclear@6 194 color = (color & ~GMASK) | (((uint32_t)ABLUE(idx)) << GSHIFT);
nuclear@4 195 }
nuclear@4 196
nuclear@4 197 *dest++ = color;
nuclear@4 198 if(!bit) {
nuclear@3 199 ++src;
nuclear@3 200 }
nuclear@3 201 }
nuclear@3 202 src += img->width / 8 * (img->nbitplanes - 1);
nuclear@3 203 }
nuclear@3 204
nuclear@3 205 if(SDL_MUSTLOCK(fbsurf)) {
nuclear@3 206 SDL_UnlockSurface(fbsurf);
nuclear@3 207 }
nuclear@3 208
nuclear@3 209 SDL_Flip(fbsurf);
nuclear@3 210 }