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#include <SDL.h>
#include <stdlib.h>
#include <stdio.h>
#include "render.h"
SDL_Surface *screen;
uint8_t render_dbg = 0;
uint32_t last_frame = 0;
void render_init(int width, int height)
{
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
exit(1);
}
atexit(SDL_Quit);
printf("width: %d, height: %d\n", width, height);
screen = SDL_SetVideoMode(width, height, 32, SDL_SWSURFACE | SDL_ANYFORMAT);
if (!screen) {
fprintf(stderr, "Unable to get SDL surface: %s\n", SDL_GetError());
exit(1);
}
if (screen->format->BytesPerPixel < 2) {
fprintf(stderr, "BlastEm requires at least a 16-bit surface, SDL returned a %d-bit surface\n", screen->format->BytesPerPixel * 8);
exit(1);
}
}
void render_context(vdp_context * context)
{
uint8_t *buf_8;
uint16_t *buf_16;
uint32_t *buf_32;
uint8_t b,g,r;
last_frame = SDL_GetTicks();
if (SDL_MUSTLOCK(screen)) {
if (SDL_LockSurface(screen) < 0) {
return;
}
}
uint16_t repeat_x = screen->clip_rect.w / 320;
uint16_t repeat_y = screen->clip_rect.h / 240;
if (repeat_x > repeat_y) {
repeat_x = repeat_y;
} else {
repeat_y = repeat_x;
}
switch (screen->format->BytesPerPixel) {
case 2:
buf_16 = (uint16_t *)screen->pixels;
for (int y = 0; y < 240; y++) {
for (int i = 0; i < repeat_y; i++,buf_16 += screen->pitch/2) {
uint16_t *line = buf_16;
for (int x = 0; x < 320; x++) {
uint16_t gen_color = context->framebuf[y * 320 + x];
b = ((gen_color >> 8) & 0xE) * 18;
g = ((gen_color >> 4) & 0xE) * 18;
r = (gen_color& 0xE) * 18;
for (int j = 0; j < repeat_x; j++) {
*(line++) = SDL_MapRGB(screen->format, r, g, b);
}
}
}
}
break;
case 3:
buf_8 = (uint8_t *)screen->pixels;
for (int y = 0; y < 240; y++) {
for (int i = 0; i < repeat_y; i++,buf_8 += screen->pitch) {
uint8_t *line = buf_8;
for (int x = 0; x < 320; x++) {
uint16_t gen_color = context->framebuf[y * 320 + x];
b = ((gen_color >> 8) & 0xE) * 18;
g = ((gen_color >> 4) & 0xE) * 18;
r = (gen_color& 0xE) * 18;
for (int j = 0; j < repeat_x; j++) {
*(buf_8+screen->format->Rshift/8) = r;
*(buf_8+screen->format->Gshift/8) = g;
*(buf_8+screen->format->Bshift/8) = b;
buf_8 += 3;
}
}
}
}
break;
case 4:
buf_32 = (uint32_t *)screen->pixels;
for (int y = 0; y < 240; y++) {
for (int i = 0; i < repeat_y; i++,buf_32 += screen->pitch/4) {
uint32_t *line = buf_32;
for (int x = 0; x < 320; x++) {
uint16_t gen_color = context->framebuf[y * 320 + x];
if (render_dbg) {
r = g = b = 0;
switch(gen_color & FBUF_SRC_MASK)
{
case FBUF_SRC_A:
g = 127;
break;
case FBUF_SRC_W:
g = 127;
b = 127;
break;
case FBUF_SRC_B:
b = 127;
break;
case FBUF_SRC_S:
r = 127;
break;
case FBUF_SRC_BG:
r = 127;
b = 127;
}
if (gen_color & FBUF_BIT_PRIORITY) {
b *= 2;
g *= 2;
r *= 2;
}
} else {
b = ((gen_color >> 8) & 0xE) * 18;
g = ((gen_color >> 4) & 0xE) * 18;
r = (gen_color& 0xE) * 18;
}
for (int j = 0; j < repeat_x; j++) {
*(line++) = SDL_MapRGB(screen->format, r, g, b);
}
}
}
}
break;
}
if ( SDL_MUSTLOCK(screen) ) {
SDL_UnlockSurface(screen);
}
SDL_UpdateRect(screen, 0, 0, screen->clip_rect.w, screen->clip_rect.h);
}
void render_wait_quit(vdp_context * context)
{
SDL_Event event;
while(SDL_WaitEvent(&event)) {
switch (event.type) {
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_LEFTBRACKET) {
render_dbg = !render_dbg;
render_context(context);
}
break;
case SDL_QUIT:
return;
}
}
}
#define FRAME_DELAY 16
#define MIN_DELAY 10
void wait_render_frame(vdp_context * context)
{
SDL_Event event;
while(SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_KEYDOWN:
//TODO: Update emulated gamepads
if (event.key.keysym.sym == SDLK_LEFTBRACKET) {
render_dbg = !render_dbg;
render_context(context);
}
break;
case SDL_QUIT:
exit(0);
}
}
//TODO: Adjust frame delay so we actually get 60 FPS rather than 62.5 FPS
uint32_t current = SDL_GetTicks();
uint32_t desired = last_frame + FRAME_DELAY;
if (current < desired) {
uint32_t delay = last_frame + FRAME_DELAY - current;
//TODO: Calculate MIN_DELAY at runtime
if (delay > MIN_DELAY) {
SDL_Delay((delay/MIN_DELAY)*MIN_DELAY);
}
while ((desired) < SDL_GetTicks()) {
}
}
render_context(context);
}
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