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annotate render_sdl.c @ 27:aa1c47fab3f1

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Fix sprite transparency for overlapping sprites
author Mike Pavone <pavone@retrodev.com>
date Sat, 08 Dec 2012 16:58:11 -0800
parents f664eeb55cb4
children 037963b4c92d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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20
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1 #include <SDL.h>
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2 #include <stdlib.h>
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3 #include <stdio.h>
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4 #include "render.h"
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5
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6 SDL_Surface *screen;
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7
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8 void render_init()
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9 {
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10 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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11 fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
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12 exit(1);
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13 }
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14 atexit(SDL_Quit);
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15 screen = SDL_SetVideoMode(320, 240, 32, SDL_SWSURFACE | SDL_ANYFORMAT);
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16 if (!screen) {
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17 fprintf(stderr, "Unable to get SDL surface: %s\n", SDL_GetError());
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18 exit(1);
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19 }
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20 if (screen->format->BytesPerPixel < 2) {
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21 fprintf(stderr, "BlastEm requires at least a 16-bit surface, SDL returned a %d-bit surface\n", screen->format->BytesPerPixel * 8);
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22 exit(1);
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23 }
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24 }
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25
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26 void render_context(vdp_context * context)
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27 {
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28 uint8_t *buf_8;
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29 uint16_t *buf_16;
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30 uint32_t *buf_32;
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31 uint8_t b,g,r;
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32 if (SDL_MUSTLOCK(screen)) {
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33 if (SDL_LockSurface(screen) < 0) {
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34 return;
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35 }
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36 }
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37 switch (screen->format->BytesPerPixel) {
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38 case 2:
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39 buf_16 = (uint16_t *)screen->pixels;
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40 for (int y = 0; y < 240; y++, buf_16 += (screen->pitch/2 - 320)) {
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41 for (int x = 0; x < 320; x++, buf_16++) {
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42 uint16_t gen_color = context->framebuf[y * 320 + x];
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43 b = ((gen_color >> 8) & 0xE) * 18;
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44 g = ((gen_color >> 4) & 0xE) * 18;
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45 r = (gen_color& 0xE) * 18;
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46 *buf_16 = SDL_MapRGB(screen->format, r, g, b);
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47 }
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48 }
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49 break;
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50 case 3:
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51 buf_8 = (uint8_t *)screen->pixels;
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52 for (int y = 0; y < 240; y++, buf_8 += (screen->pitch - 320)) {
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53 for (int x = 0; x < 320; x++, buf_8 += 3) {
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54 uint16_t gen_color = context->framebuf[y * 320 + x];
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55 b = ((gen_color >> 8) & 0xE) * 18;
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56 g = ((gen_color >> 4) & 0xE) * 18;
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57 r = (gen_color& 0xE) * 18;
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58 *(buf_8+screen->format->Rshift/8) = r;
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59 *(buf_8+screen->format->Gshift/8) = g;
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60 *(buf_8+screen->format->Bshift/8) = b;
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61 }
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62 }
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63 break;
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64 case 4:
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65 buf_32 = (uint32_t *)screen->pixels;
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66 for (int y = 0; y < 224; y++, buf_32 += (screen->pitch/4 - 320)) {
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67 for (int x = 0; x < 320; x++, buf_32++) {
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68 uint16_t gen_color = context->framebuf[y * 320 + x];
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69 b = ((gen_color >> 8) & 0xE) * 18;
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70 g = ((gen_color >> 4) & 0xE) * 18;
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71 r = (gen_color& 0xE) * 18;
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72 *buf_32 = SDL_MapRGB(screen->format, r, g, b);
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73 }
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74 }
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75 for (int y = 224; y < 240; y++, buf_32 += (screen->pitch/4 - 320)) {
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76 for (int x = 0; x < 320; x++, buf_32++) {
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77 uint16_t gen_color = context->cram[x/10 + ((y-224)/8)*32];
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78 b = ((gen_color >> 8) & 0xE) * 18;
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79 g = ((gen_color >> 4) & 0xE) * 18;
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80 r = (gen_color& 0xE) * 18;
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81 *buf_32 = SDL_MapRGB(screen->format, r, g, b);
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82 }
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83 }
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84 break;
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85 }
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86 if ( SDL_MUSTLOCK(screen) ) {
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87 SDL_UnlockSurface(screen);
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88 }
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89 SDL_UpdateRect(screen, 0, 0, 320, 240);
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90 }
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91
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92 void render_wait_quit()
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93 {
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94 SDL_Event event;
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95 while(SDL_WaitEvent(&event)) {
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96 switch (event.type) {
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97 case SDL_QUIT:
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98 return;
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99 }
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100 }
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101 }
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102