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comparison 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
comparison
equal deleted inserted replaced
32:8602ad493794 33:2e15fa26fe58
3 #include <stdio.h> 3 #include <stdio.h>
4 #include "render.h" 4 #include "render.h"
5 5
6 SDL_Surface *screen; 6 SDL_Surface *screen;
7 7
8 void render_init() 8 void render_init(int width, int height)
9 { 9 {
10 if (SDL_Init(SDL_INIT_VIDEO) < 0) { 10 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
11 fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError()); 11 fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
12 exit(1); 12 exit(1);
13 } 13 }
14 atexit(SDL_Quit); 14 atexit(SDL_Quit);
15 screen = SDL_SetVideoMode(320, 240, 32, SDL_SWSURFACE | SDL_ANYFORMAT); 15 printf("width: %d, height: %d\n", width, height);
16 screen = SDL_SetVideoMode(width, height, 32, SDL_SWSURFACE | SDL_ANYFORMAT);
16 if (!screen) { 17 if (!screen) {
17 fprintf(stderr, "Unable to get SDL surface: %s\n", SDL_GetError()); 18 fprintf(stderr, "Unable to get SDL surface: %s\n", SDL_GetError());
18 exit(1); 19 exit(1);
19 } 20 }
20 if (screen->format->BytesPerPixel < 2) { 21 if (screen->format->BytesPerPixel < 2) {
32 if (SDL_MUSTLOCK(screen)) { 33 if (SDL_MUSTLOCK(screen)) {
33 if (SDL_LockSurface(screen) < 0) { 34 if (SDL_LockSurface(screen) < 0) {
34 return; 35 return;
35 } 36 }
36 } 37 }
38 uint16_t repeat_x = screen->clip_rect.w / 320;
39 uint16_t repeat_y = screen->clip_rect.h / 240;
40 if (repeat_x > repeat_y) {
41 repeat_x = repeat_y;
42 } else {
43 repeat_y = repeat_x;
44 }
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);
37 switch (screen->format->BytesPerPixel) { 46 switch (screen->format->BytesPerPixel) {
38 case 2: 47 case 2:
39 buf_16 = (uint16_t *)screen->pixels; 48 buf_16 = (uint16_t *)screen->pixels;
40 for (int y = 0; y < 240; y++, buf_16 += (screen->pitch/2 - 320)) { 49 for (int y = 0; y < 240; y++) {
41 for (int x = 0; x < 320; x++, buf_16++) { 50 for (int i = 0; i < repeat_y; i++,buf_16 += screen->pitch/2) {
42 uint16_t gen_color = context->framebuf[y * 320 + x]; 51 uint16_t *line = buf_16;
43 b = ((gen_color >> 8) & 0xE) * 18; 52 for (int x = 0; x < 320; x++) {
44 g = ((gen_color >> 4) & 0xE) * 18; 53 uint16_t gen_color = context->framebuf[y * 320 + x];
45 r = (gen_color& 0xE) * 18; 54 b = ((gen_color >> 8) & 0xE) * 18;
46 *buf_16 = SDL_MapRGB(screen->format, r, g, b); 55 g = ((gen_color >> 4) & 0xE) * 18;
47 } 56 r = (gen_color& 0xE) * 18;
57 for (int j = 0; j < repeat_x; j++) {
58 *(line++) = SDL_MapRGB(screen->format, r, g, b);
59 }
60 }
61 }
48 } 62 }
49 break; 63 break;
50 case 3: 64 case 3:
51 buf_8 = (uint8_t *)screen->pixels; 65 buf_8 = (uint8_t *)screen->pixels;
52 for (int y = 0; y < 240; y++, buf_8 += (screen->pitch - 320)) { 66 for (int y = 0; y < 240; y++) {
53 for (int x = 0; x < 320; x++, buf_8 += 3) { 67 for (int i = 0; i < repeat_y; i++,buf_8 += screen->pitch) {
54 uint16_t gen_color = context->framebuf[y * 320 + x]; 68 uint8_t *line = buf_8;
55 b = ((gen_color >> 8) & 0xE) * 18; 69 for (int x = 0; x < 320; x++) {
56 g = ((gen_color >> 4) & 0xE) * 18; 70 uint16_t gen_color = context->framebuf[y * 320 + x];
57 r = (gen_color& 0xE) * 18; 71 b = ((gen_color >> 8) & 0xE) * 18;
58 *(buf_8+screen->format->Rshift/8) = r; 72 g = ((gen_color >> 4) & 0xE) * 18;
59 *(buf_8+screen->format->Gshift/8) = g; 73 r = (gen_color& 0xE) * 18;
60 *(buf_8+screen->format->Bshift/8) = b; 74 for (int j = 0; j < repeat_x; j++) {
61 } 75 *(buf_8+screen->format->Rshift/8) = r;
76 *(buf_8+screen->format->Gshift/8) = g;
77 *(buf_8+screen->format->Bshift/8) = b;
78 buf_8 += 3;
79 }
80 }
81 }
62 } 82 }
63 break; 83 break;
64 case 4: 84 case 4:
65 buf_32 = (uint32_t *)screen->pixels; 85 buf_32 = (uint32_t *)screen->pixels;
66 for (int y = 0; y < 224; y++, buf_32 += (screen->pitch/4 - 320)) { 86 for (int y = 0; y < 240; y++) {
67 for (int x = 0; x < 320; x++, buf_32++) { 87 for (int i = 0; i < repeat_y; i++,buf_32 += screen->pitch/4) {
68 uint16_t gen_color = context->framebuf[y * 320 + x]; 88 uint32_t *line = buf_32;
69 b = ((gen_color >> 8) & 0xE) * 18; 89 for (int x = 0; x < 320; x++) {
70 g = ((gen_color >> 4) & 0xE) * 18; 90 uint16_t gen_color = context->framebuf[y * 320 + x];
71 r = (gen_color& 0xE) * 18; 91 b = ((gen_color >> 8) & 0xE) * 18;
72 *buf_32 = SDL_MapRGB(screen->format, r, g, b); 92 g = ((gen_color >> 4) & 0xE) * 18;
73 } 93 r = (gen_color& 0xE) * 18;
74 } 94 for (int j = 0; j < repeat_x; j++) {
75 for (int y = 224; y < 240; y++, buf_32 += (screen->pitch/4 - 320)) { 95 *(line++) = SDL_MapRGB(screen->format, r, g, b);
76 for (int x = 0; x < 256; x++, buf_32++) { 96 }
77 uint16_t gen_color = context->cram[x/8 + ((y-224)/8)*32]; 97 }
78 b = ((gen_color >> 8) & 0xE) * 18;
79 g = ((gen_color >> 4) & 0xE) * 18;
80 r = (gen_color& 0xE) * 18;
81 *buf_32 = SDL_MapRGB(screen->format, r, g, b);
82 }
83 for (int x = 256; x < 320; x++, buf_32++) {
84 if ((x/8 & 1) ^ (y/8 & 1)) {
85 b = g = r = 255;
86 } else {
87 b = g = r = 0;
88 }
89 *buf_32 = SDL_MapRGB(screen->format, r, g, b);
90 } 98 }
91 } 99 }
92 break; 100 break;
93 } 101 }
94 if ( SDL_MUSTLOCK(screen) ) { 102 if ( SDL_MUSTLOCK(screen) ) {
95 SDL_UnlockSurface(screen); 103 SDL_UnlockSurface(screen);
96 } 104 }
97 SDL_UpdateRect(screen, 0, 0, 320, 240); 105 SDL_UpdateRect(screen, 0, 0, screen->clip_rect.w, screen->clip_rect.h);
98 } 106 }
99 107
100 void render_wait_quit() 108 void render_wait_quit()
101 { 109 {
102 SDL_Event event; 110 SDL_Event event;