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annotate render_sdl.c @ 33:2e15fa26fe58

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Add support for simple resolution scaling
author Mike Pavone <pavone@retrodev.com>
date Sat, 08 Dec 2012 22:07:25 -0800
parents 037963b4c92d
children 3fc57e1a2c56
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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(int width, int height)
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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 printf("width: %d, height: %d\n", width, height);
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16 screen = SDL_SetVideoMode(width, height, 32, SDL_SWSURFACE | SDL_ANYFORMAT);
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17 if (!screen) {
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18 fprintf(stderr, "Unable to get SDL surface: %s\n", SDL_GetError());
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19 exit(1);
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20 }
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21 if (screen->format->BytesPerPixel < 2) {
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22 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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23 exit(1);
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24 }
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25 }
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27 void render_context(vdp_context * context)
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28 {
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29 uint8_t *buf_8;
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30 uint16_t *buf_16;
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31 uint32_t *buf_32;
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32 uint8_t b,g,r;
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33 if (SDL_MUSTLOCK(screen)) {
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34 if (SDL_LockSurface(screen) < 0) {
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35 return;
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36 }
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37 }
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38 uint16_t repeat_x = screen->clip_rect.w / 320;
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39 uint16_t repeat_y = screen->clip_rect.h / 240;
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40 if (repeat_x > repeat_y) {
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41 repeat_x = repeat_y;
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42 } else {
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43 repeat_y = repeat_x;
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44 }
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45 printf("w: %d, h: %d, repeat_x: %d, repeat_y: %d\n", screen->clip_rect.w, screen->clip_rect.h, repeat_x, repeat_y);
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46 switch (screen->format->BytesPerPixel) {
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47 case 2:
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48 buf_16 = (uint16_t *)screen->pixels;
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49 for (int y = 0; y < 240; y++) {
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50 for (int i = 0; i < repeat_y; i++,buf_16 += screen->pitch/2) {
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51 uint16_t *line = buf_16;
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52 for (int x = 0; x < 320; x++) {
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53 uint16_t gen_color = context->framebuf[y * 320 + x];
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54 b = ((gen_color >> 8) & 0xE) * 18;
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55 g = ((gen_color >> 4) & 0xE) * 18;
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56 r = (gen_color& 0xE) * 18;
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57 for (int j = 0; j < repeat_x; j++) {
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58 *(line++) = SDL_MapRGB(screen->format, r, g, b);
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59 }
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60 }
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61 }
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62 }
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63 break;
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64 case 3:
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65 buf_8 = (uint8_t *)screen->pixels;
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66 for (int y = 0; y < 240; y++) {
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67 for (int i = 0; i < repeat_y; i++,buf_8 += screen->pitch) {
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68 uint8_t *line = buf_8;
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69 for (int x = 0; x < 320; x++) {
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70 uint16_t gen_color = context->framebuf[y * 320 + x];
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71 b = ((gen_color >> 8) & 0xE) * 18;
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72 g = ((gen_color >> 4) & 0xE) * 18;
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73 r = (gen_color& 0xE) * 18;
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74 for (int j = 0; j < repeat_x; j++) {
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75 *(buf_8+screen->format->Rshift/8) = r;
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76 *(buf_8+screen->format->Gshift/8) = g;
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77 *(buf_8+screen->format->Bshift/8) = b;
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78 buf_8 += 3;
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79 }
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80 }
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81 }
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82 }
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83 break;
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84 case 4:
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85 buf_32 = (uint32_t *)screen->pixels;
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86 for (int y = 0; y < 240; y++) {
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87 for (int i = 0; i < repeat_y; i++,buf_32 += screen->pitch/4) {
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88 uint32_t *line = buf_32;
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89 for (int x = 0; x < 320; x++) {
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90 uint16_t gen_color = context->framebuf[y * 320 + x];
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91 b = ((gen_color >> 8) & 0xE) * 18;
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92 g = ((gen_color >> 4) & 0xE) * 18;
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93 r = (gen_color& 0xE) * 18;
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94 for (int j = 0; j < repeat_x; j++) {
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95 *(line++) = SDL_MapRGB(screen->format, r, g, b);
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96 }
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97 }
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98 }
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99 }
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100 break;
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101 }
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102 if ( SDL_MUSTLOCK(screen) ) {
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103 SDL_UnlockSurface(screen);
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104 }
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105 SDL_UpdateRect(screen, 0, 0, screen->clip_rect.w, screen->clip_rect.h);
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106 }
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107
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108 void render_wait_quit()
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109 {
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110 SDL_Event event;
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111 while(SDL_WaitEvent(&event)) {
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112 switch (event.type) {
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113 case SDL_QUIT:
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114 return;
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115 }
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116 }
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117 }
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118