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annotate render_sdl.c @ 43:3fc57e1a2c56

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Add debug render mode and fix vertical flip bit for bg tiles
author Mike Pavone <pavone@retrodev.com>
date Sun, 09 Dec 2012 18:40:45 -0800
parents 2e15fa26fe58
children 3b79cbcf6846
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 uint8_t render_dbg = 0;
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8
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9 void render_init(int width, int height)
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10 {
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11 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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12 fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
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13 exit(1);
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14 }
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15 atexit(SDL_Quit);
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16 printf("width: %d, height: %d\n", width, height);
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17 screen = SDL_SetVideoMode(width, height, 32, SDL_SWSURFACE | SDL_ANYFORMAT);
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18 if (!screen) {
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19 fprintf(stderr, "Unable to get SDL surface: %s\n", SDL_GetError());
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20 exit(1);
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21 }
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22 if (screen->format->BytesPerPixel < 2) {
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23 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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24 exit(1);
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25 }
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26 }
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28 void render_context(vdp_context * context)
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29 {
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30 uint8_t *buf_8;
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31 uint16_t *buf_16;
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32 uint32_t *buf_32;
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33 uint8_t b,g,r;
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34 if (SDL_MUSTLOCK(screen)) {
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35 if (SDL_LockSurface(screen) < 0) {
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36 return;
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37 }
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38 }
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39 uint16_t repeat_x = screen->clip_rect.w / 320;
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40 uint16_t repeat_y = screen->clip_rect.h / 240;
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41 if (repeat_x > repeat_y) {
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42 repeat_x = repeat_y;
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43 } else {
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44 repeat_y = repeat_x;
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45 }
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46 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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47 switch (screen->format->BytesPerPixel) {
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48 case 2:
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49 buf_16 = (uint16_t *)screen->pixels;
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50 for (int y = 0; y < 240; y++) {
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51 for (int i = 0; i < repeat_y; i++,buf_16 += screen->pitch/2) {
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52 uint16_t *line = buf_16;
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53 for (int x = 0; x < 320; x++) {
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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 for (int j = 0; j < repeat_x; j++) {
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59 *(line++) = SDL_MapRGB(screen->format, r, g, b);
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60 }
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61 }
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62 }
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63 }
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64 break;
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65 case 3:
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66 buf_8 = (uint8_t *)screen->pixels;
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67 for (int y = 0; y < 240; y++) {
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68 for (int i = 0; i < repeat_y; i++,buf_8 += screen->pitch) {
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69 uint8_t *line = buf_8;
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70 for (int x = 0; x < 320; x++) {
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71 uint16_t gen_color = context->framebuf[y * 320 + x];
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72 b = ((gen_color >> 8) & 0xE) * 18;
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73 g = ((gen_color >> 4) & 0xE) * 18;
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74 r = (gen_color& 0xE) * 18;
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75 for (int j = 0; j < repeat_x; j++) {
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76 *(buf_8+screen->format->Rshift/8) = r;
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77 *(buf_8+screen->format->Gshift/8) = g;
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78 *(buf_8+screen->format->Bshift/8) = b;
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79 buf_8 += 3;
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80 }
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81 }
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82 }
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83 }
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84 break;
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85 case 4:
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86 buf_32 = (uint32_t *)screen->pixels;
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87 for (int y = 0; y < 240; y++) {
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88 for (int i = 0; i < repeat_y; i++,buf_32 += screen->pitch/4) {
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89 uint32_t *line = buf_32;
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90 for (int x = 0; x < 320; x++) {
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91 uint16_t gen_color = context->framebuf[y * 320 + x];
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92 if (render_dbg) {
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93 r = g = b = 0;
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94 switch(gen_color & FBUF_SRC_MASK)
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95 {
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96 case FBUF_SRC_A:
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97 g = 127;
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98 break;
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99 case FBUF_SRC_W:
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100 g = 127;
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101 b = 127;
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102 break;
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103 case FBUF_SRC_B:
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104 b = 127;
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105 break;
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106 case FBUF_SRC_S:
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107 r = 127;
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108 break;
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109 case FBUF_SRC_BG:
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110 r = 127;
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111 b = 127;
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112 }
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113 if (gen_color & FBUF_BIT_PRIORITY) {
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114 b *= 2;
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115 g *= 2;
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116 r *= 2;
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117 }
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118 } else {
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119 b = ((gen_color >> 8) & 0xE) * 18;
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120 g = ((gen_color >> 4) & 0xE) * 18;
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121 r = (gen_color& 0xE) * 18;
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122 }
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123 for (int j = 0; j < repeat_x; j++) {
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124 *(line++) = SDL_MapRGB(screen->format, r, g, b);
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125 }
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126 }
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127 }
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128 }
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129 break;
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130 }
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131 if ( SDL_MUSTLOCK(screen) ) {
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132 SDL_UnlockSurface(screen);
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133 }
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134 SDL_UpdateRect(screen, 0, 0, screen->clip_rect.w, screen->clip_rect.h);
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135 }
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136
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137 void render_wait_quit(vdp_context * context)
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138 {
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139 SDL_Event event;
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140 while(SDL_WaitEvent(&event)) {
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141 switch (event.type) {
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142 case SDL_KEYDOWN:
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143 if (event.key.keysym.sym == SDLK_LEFTBRACKET) {
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144 render_dbg = !render_dbg;
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145 render_context(context);
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146 }
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147 break;
20
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148 case SDL_QUIT:
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149 return;
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150 }
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151 }
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152 }
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153