amiga_imgv

annotate src/sdl/gfx.c @ 6:ae0ada629b03

find changesets by author, revision, files, or words in the commit message
wohooo it works :)
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 27 Oct 2017 15:42:58 +0300
parents 0d3d7b020e6a
children 4c36d0f44aa6
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@3 10
nuclear@3 11
nuclear@3 12 int gfx_init(int nbpl, unsigned int flags)
nuclear@3 13 {
nuclear@3 14 num_bitplanes = nbpl;
nuclear@3 15 scr_width = fb_width = (flags & GFX_HIRES) ? 640 : 320;
nuclear@3 16 scr_height = fb_height = (flags & GFX_ILACE) ? 512 : 256;
nuclear@3 17
nuclear@3 18 if(SDL_Init(SDL_INIT_VIDEO) == -1) {
nuclear@3 19 fprintf(stderr, "failed to initialize SDL\n");
nuclear@3 20 return -1;
nuclear@3 21 }
nuclear@3 22 if(!(fbsurf = SDL_SetVideoMode(scr_width, scr_height, 32, SDL_SWSURFACE))) {
nuclear@3 23 fprintf(stderr, "failed to set video mode %dx%d\n", scr_width, scr_height);
nuclear@3 24 SDL_Quit();
nuclear@3 25 return -1;
nuclear@3 26 }
nuclear@4 27 SDL_WM_SetCaption("imgv SDL version", 0);
nuclear@3 28
nuclear@3 29 return 0;
nuclear@3 30 }
nuclear@3 31
nuclear@3 32 void gfx_shutdown(void)
nuclear@3 33 {
nuclear@3 34 SDL_Quit();
nuclear@3 35 }
nuclear@3 36
nuclear@3 37
nuclear@3 38 int gfx_screen_width(void)
nuclear@3 39 {
nuclear@3 40 return scr_width;
nuclear@3 41 }
nuclear@3 42
nuclear@3 43 int gfx_screen_height(void)
nuclear@3 44 {
nuclear@3 45 return scr_height;
nuclear@3 46 }
nuclear@3 47
nuclear@3 48
nuclear@3 49 void *gfx_set_framebuffer(void *fb, int width, int height)
nuclear@3 50 {
nuclear@3 51 return 0;
nuclear@3 52 }
nuclear@3 53
nuclear@3 54 void *gfx_get_framebuffer(void)
nuclear@3 55 {
nuclear@3 56 return 0;
nuclear@3 57 }
nuclear@3 58
nuclear@3 59
nuclear@3 60 int get_framebuffer_width(void)
nuclear@3 61 {
nuclear@3 62 return fb_width;
nuclear@3 63 }
nuclear@3 64
nuclear@3 65 int get_framebuffer_height(void)
nuclear@3 66 {
nuclear@3 67 return fb_height;
nuclear@3 68 }
nuclear@3 69
nuclear@3 70
nuclear@3 71 void gfx_begin_copperlist(void)
nuclear@3 72 {
nuclear@3 73 }
nuclear@3 74
nuclear@3 75
nuclear@3 76 int gfx_next_event(union gfx_event *ev, int block)
nuclear@3 77 {
nuclear@3 78 SDL_Event sdlev;
nuclear@3 79
nuclear@3 80 if(block) {
nuclear@3 81 SDL_WaitEvent(&sdlev);
nuclear@3 82 } else {
nuclear@3 83 if(!SDL_PollEvent(&sdlev)) {
nuclear@3 84 return 0;
nuclear@3 85 }
nuclear@3 86 }
nuclear@3 87
nuclear@3 88 switch(sdlev.type) {
nuclear@3 89 case SDL_QUIT:
nuclear@3 90 ev->type = GFX_EV_QUIT;
nuclear@3 91 return 1;
nuclear@3 92
nuclear@3 93 case SDL_KEYDOWN:
nuclear@3 94 case SDL_KEYUP:
nuclear@3 95 ev->type = GFX_EV_KEY;
nuclear@3 96 ev->key.key = sdlev.key.keysym.sym;
nuclear@3 97 ev->key.pressed = sdlev.key.state == SDL_PRESSED;
nuclear@3 98 return 1;
nuclear@3 99
nuclear@3 100 default:
nuclear@3 101 break;
nuclear@3 102 }
nuclear@3 103 return 0;
nuclear@3 104 }
nuclear@3 105
nuclear@3 106
nuclear@3 107 void gfx_wait_vpos(int x)
nuclear@3 108 {
nuclear@3 109 }
nuclear@3 110
nuclear@3 111 void gfx_wait_vblank(void)
nuclear@3 112 {
nuclear@3 113 }
nuclear@3 114
nuclear@3 115 #define ARED(x) ((((x) & 0xf00) >> 4) | (((x) & 0xf00) >> 8))
nuclear@3 116 #define AGREEN(x) (((x) & 0xf0) | (((x) & 0xf0) >> 4))
nuclear@3 117 #define ABLUE(x) ((((x) & 0xf) << 4) | ((x) & 0xf))
nuclear@3 118
nuclear@4 119 #define RSHIFT (fbsurf->format->Rshift)
nuclear@4 120 #define GSHIFT (fbsurf->format->Gshift)
nuclear@4 121 #define BSHIFT (fbsurf->format->Bshift)
nuclear@4 122 #define RMASK (fbsurf->format->Rmask)
nuclear@4 123 #define GMASK (fbsurf->format->Gmask)
nuclear@4 124 #define BMASK (fbsurf->format->Bmask)
nuclear@4 125
nuclear@6 126 #define PACKRGB(r, g, b) ((((r) << RSHIFT) & RMASK) | \
nuclear@6 127 (((g) << GSHIFT) & GMASK) | \
nuclear@6 128 (((b) << BSHIFT) & BMASK))
nuclear@6 129
nuclear@3 130 void gfx_show_image(struct ham_image *img)
nuclear@3 131 {
nuclear@3 132 int i, j, k;
nuclear@6 133 uint32_t color, palette[16];
nuclear@3 134 uint32_t *dest;
nuclear@3 135 unsigned char *src;
nuclear@6 136 struct palchange *chg = img->chglist;
nuclear@3 137
nuclear@3 138 for(i=0; i<16; i++) {
nuclear@3 139 uint16_t pcol = img->palette[i];
nuclear@3 140 int red = ARED(pcol);
nuclear@3 141 int green = AGREEN(pcol);
nuclear@3 142 int blue = ABLUE(pcol);
nuclear@6 143 palette[i] = PACKRGB(red, green, blue);
nuclear@3 144 }
nuclear@3 145
nuclear@3 146 if(SDL_MUSTLOCK(fbsurf)) {
nuclear@3 147 SDL_LockSurface(fbsurf);
nuclear@3 148 }
nuclear@3 149
nuclear@3 150 dest = fbsurf->pixels;
nuclear@3 151 src = img->pixels;
nuclear@3 152 for(i=0; i<img->height; i++) {
nuclear@6 153 while(chg && chg->line <= i) {
nuclear@6 154 int idx = (chg->entry & 0xf000) >> 12;
nuclear@6 155 int red = ARED(chg->entry);
nuclear@6 156 int green = AGREEN(chg->entry);
nuclear@6 157 int blue = ABLUE(chg->entry);
nuclear@6 158 palette[idx] = PACKRGB(red, green, blue);
nuclear@6 159 chg = chg->next;
nuclear@6 160 }
nuclear@6 161
nuclear@3 162 for(j=0; j<img->width; j++) {
nuclear@3 163 unsigned char idx = 0;
nuclear@4 164 unsigned char ham;
nuclear@4 165 int bit = 7 - (j & 7);
nuclear@4 166
nuclear@3 167 for(k=0; k<img->nbitplanes; k++) {
nuclear@5 168 idx |= (((*(src + k * img->width / 8) >> bit) & 1) << k);
nuclear@3 169 }
nuclear@4 170
nuclear@5 171 ham = (idx >> 4) & 3;
nuclear@4 172
nuclear@4 173 switch(ham) {
nuclear@4 174 case 0:
nuclear@4 175 color = palette[idx];
nuclear@4 176 break;
nuclear@4 177 case 1:
nuclear@6 178 color = (color & ~BMASK) | (((uint32_t)ABLUE(idx)) << BSHIFT);
nuclear@4 179 break;
nuclear@4 180 case 2:
nuclear@6 181 color = (color & ~RMASK) | (((uint32_t)ABLUE(idx)) << RSHIFT);
nuclear@4 182 break;
nuclear@4 183 case 3:
nuclear@6 184 color = (color & ~GMASK) | (((uint32_t)ABLUE(idx)) << GSHIFT);
nuclear@4 185 }
nuclear@4 186
nuclear@4 187 *dest++ = color;
nuclear@4 188 if(!bit) {
nuclear@3 189 ++src;
nuclear@3 190 }
nuclear@3 191 }
nuclear@3 192 src += img->width / 8 * (img->nbitplanes - 1);
nuclear@3 193 }
nuclear@3 194
nuclear@3 195 if(SDL_MUSTLOCK(fbsurf)) {
nuclear@3 196 SDL_UnlockSurface(fbsurf);
nuclear@3 197 }
nuclear@3 198
nuclear@3 199 SDL_Flip(fbsurf);
nuclear@3 200 }