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sm64/src/pc/gfx/gfx_sdl2.c

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#include "../compat.h"
#if defined(ENABLE_OPENGL)
#ifdef __MINGW32__
#define FOR_WINDOWS 1
#else
#define FOR_WINDOWS 0
#endif
#if FOR_WINDOWS
#include <GL/glew.h>
#include "SDL.h"
#define GL_GLEXT_PROTOTYPES 1
#include "SDL_opengl.h"
#else
#include <SDL2/SDL.h>
#define GL_GLEXT_PROTOTYPES 1
#include <SDL2/SDL_opengles2.h>
#endif
#include "gfx_window_manager_api.h"
#include "gfx_screen_config.h"
#define GFX_API_NAME "SDL2 - OpenGL"
static SDL_Window *wnd;
static int inverted_scancode_table[512];
static int vsync_enabled = 0;
static unsigned int window_width = DESIRED_SCREEN_WIDTH;
static unsigned int window_height = DESIRED_SCREEN_HEIGHT;
static bool fullscreen_state;
static void (*on_fullscreen_changed_callback)(bool is_now_fullscreen);
static bool (*on_key_down_callback)(int scancode);
static bool (*on_key_up_callback)(int scancode);
static void (*on_all_keys_up_callback)(void);
const SDL_Scancode windows_scancode_table[] =
{
/* 0 1 2 3 4 5 6 7 */
/* 8 9 A B C D E F */
SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_ESCAPE, SDL_SCANCODE_1, SDL_SCANCODE_2, SDL_SCANCODE_3, SDL_SCANCODE_4, SDL_SCANCODE_5, SDL_SCANCODE_6, /* 0 */
SDL_SCANCODE_7, SDL_SCANCODE_8, SDL_SCANCODE_9, SDL_SCANCODE_0, SDL_SCANCODE_MINUS, SDL_SCANCODE_EQUALS, SDL_SCANCODE_BACKSPACE, SDL_SCANCODE_TAB, /* 0 */
SDL_SCANCODE_Q, SDL_SCANCODE_W, SDL_SCANCODE_E, SDL_SCANCODE_R, SDL_SCANCODE_T, SDL_SCANCODE_Y, SDL_SCANCODE_U, SDL_SCANCODE_I, /* 1 */
SDL_SCANCODE_O, SDL_SCANCODE_P, SDL_SCANCODE_LEFTBRACKET, SDL_SCANCODE_RIGHTBRACKET, SDL_SCANCODE_RETURN, SDL_SCANCODE_LCTRL, SDL_SCANCODE_A, SDL_SCANCODE_S, /* 1 */
SDL_SCANCODE_D, SDL_SCANCODE_F, SDL_SCANCODE_G, SDL_SCANCODE_H, SDL_SCANCODE_J, SDL_SCANCODE_K, SDL_SCANCODE_L, SDL_SCANCODE_SEMICOLON, /* 2 */
SDL_SCANCODE_APOSTROPHE, SDL_SCANCODE_GRAVE, SDL_SCANCODE_LSHIFT, SDL_SCANCODE_BACKSLASH, SDL_SCANCODE_Z, SDL_SCANCODE_X, SDL_SCANCODE_C, SDL_SCANCODE_V, /* 2 */
SDL_SCANCODE_B, SDL_SCANCODE_N, SDL_SCANCODE_M, SDL_SCANCODE_COMMA, SDL_SCANCODE_PERIOD, SDL_SCANCODE_SLASH, SDL_SCANCODE_RSHIFT, SDL_SCANCODE_PRINTSCREEN,/* 3 */
SDL_SCANCODE_LALT, SDL_SCANCODE_SPACE, SDL_SCANCODE_CAPSLOCK, SDL_SCANCODE_F1, SDL_SCANCODE_F2, SDL_SCANCODE_F3, SDL_SCANCODE_F4, SDL_SCANCODE_F5, /* 3 */
SDL_SCANCODE_F6, SDL_SCANCODE_F7, SDL_SCANCODE_F8, SDL_SCANCODE_F9, SDL_SCANCODE_F10, SDL_SCANCODE_NUMLOCKCLEAR, SDL_SCANCODE_SCROLLLOCK, SDL_SCANCODE_HOME, /* 4 */
SDL_SCANCODE_UP, SDL_SCANCODE_PAGEUP, SDL_SCANCODE_KP_MINUS, SDL_SCANCODE_LEFT, SDL_SCANCODE_KP_5, SDL_SCANCODE_RIGHT, SDL_SCANCODE_KP_PLUS, SDL_SCANCODE_END, /* 4 */
SDL_SCANCODE_DOWN, SDL_SCANCODE_PAGEDOWN, SDL_SCANCODE_INSERT, SDL_SCANCODE_DELETE, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_NONUSBACKSLASH,SDL_SCANCODE_F11, /* 5 */
SDL_SCANCODE_F12, SDL_SCANCODE_PAUSE, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_LGUI, SDL_SCANCODE_RGUI, SDL_SCANCODE_APPLICATION, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, /* 5 */
SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_F13, SDL_SCANCODE_F14, SDL_SCANCODE_F15, SDL_SCANCODE_F16, /* 6 */
SDL_SCANCODE_F17, SDL_SCANCODE_F18, SDL_SCANCODE_F19, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, /* 6 */
SDL_SCANCODE_INTERNATIONAL2, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_INTERNATIONAL1, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN, /* 7 */
SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_INTERNATIONAL4, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_INTERNATIONAL5, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_INTERNATIONAL3, SDL_SCANCODE_UNKNOWN, SDL_SCANCODE_UNKNOWN /* 7 */
};
const SDL_Scancode scancode_rmapping_extended[][2] = {
{SDL_SCANCODE_KP_ENTER, SDL_SCANCODE_RETURN},
{SDL_SCANCODE_RALT, SDL_SCANCODE_LALT},
{SDL_SCANCODE_RCTRL, SDL_SCANCODE_LCTRL},
{SDL_SCANCODE_KP_DIVIDE, SDL_SCANCODE_SLASH},
//{SDL_SCANCODE_KP_PLUS, SDL_SCANCODE_CAPSLOCK}
};
const SDL_Scancode scancode_rmapping_nonextended[][2] = {
{SDL_SCANCODE_KP_7, SDL_SCANCODE_HOME},
{SDL_SCANCODE_KP_8, SDL_SCANCODE_UP},
{SDL_SCANCODE_KP_9, SDL_SCANCODE_PAGEUP},
{SDL_SCANCODE_KP_4, SDL_SCANCODE_LEFT},
{SDL_SCANCODE_KP_6, SDL_SCANCODE_RIGHT},
{SDL_SCANCODE_KP_1, SDL_SCANCODE_END},
{SDL_SCANCODE_KP_2, SDL_SCANCODE_DOWN},
{SDL_SCANCODE_KP_3, SDL_SCANCODE_PAGEDOWN},
{SDL_SCANCODE_KP_0, SDL_SCANCODE_INSERT},
{SDL_SCANCODE_KP_PERIOD, SDL_SCANCODE_DELETE},
{SDL_SCANCODE_KP_MULTIPLY, SDL_SCANCODE_PRINTSCREEN}
};
static void set_fullscreen(bool on, bool call_callback) {
if (fullscreen_state == on) {
return;
}
fullscreen_state = on;
if (on) {
SDL_DisplayMode mode;
SDL_GetDesktopDisplayMode(0, &mode);
window_width = mode.w;
window_height = mode.h;
} else {
window_width = DESIRED_SCREEN_WIDTH;
window_height = DESIRED_SCREEN_HEIGHT;
}
SDL_SetWindowSize(wnd, window_width, window_height);
SDL_SetWindowFullscreen(wnd, on ? SDL_WINDOW_FULLSCREEN : 0);
if (on_fullscreen_changed_callback != NULL && call_callback) {
on_fullscreen_changed_callback(on);
}
}
int test_vsync(void) {
// Even if SDL_GL_SetSwapInterval succeeds, it doesn't mean that VSync actually works.
// A 60 Hz monitor should have a swap interval of 16.67 milliseconds.
// Try to detect the length of a vsync by swapping buffers some times.
// Since the graphics card may enqueue a fixed number of frames,
// first send in four dummy frames to hopefully fill the queue.
// This method will fail if the refresh rate is changed, which, in
// combination with that we can't control the queue size (i.e. lag)
// is a reason this generic SDL2 backend should only be used as last resort.
Uint32 start;
Uint32 end;
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
start = SDL_GetTicks();
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
SDL_GL_SwapWindow(wnd);
end = SDL_GetTicks();
float average = 4.0 * 1000.0 / (end - start);
vsync_enabled = 1;
if (average > 27 && average < 33) {
SDL_GL_SetSwapInterval(1);
} else if (average > 57 && average < 63) {
SDL_GL_SetSwapInterval(2);
} else if (average > 86 && average < 94) {
SDL_GL_SetSwapInterval(3);
} else if (average > 115 && average < 125) {
SDL_GL_SetSwapInterval(4);
} else {
vsync_enabled = 0;
}
}
static void gfx_sdl_init(const char *game_name, bool start_in_fullscreen) {
SDL_Init(SDL_INIT_VIDEO);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
//SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
//SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
char title[512];
int len = sprintf(title, "%s (%s)", game_name, GFX_API_NAME);
wnd = SDL_CreateWindow(title, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
window_width, window_height, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
if (start_in_fullscreen) {
set_fullscreen(true, false);
}
SDL_GL_CreateContext(wnd);
SDL_GL_SetSwapInterval(1);
test_vsync();
if (!vsync_enabled)
puts("Warning: VSync is not enabled or not working. Falling back to timer for synchronization");
for (size_t i = 0; i < sizeof(windows_scancode_table) / sizeof(SDL_Scancode); i++) {
inverted_scancode_table[windows_scancode_table[i]] = i;
}
for (size_t i = 0; i < sizeof(scancode_rmapping_extended) / sizeof(scancode_rmapping_extended[0]); i++) {
inverted_scancode_table[scancode_rmapping_extended[i][0]] = inverted_scancode_table[scancode_rmapping_extended[i][1]] + 0x100;
}
for (size_t i = 0; i < sizeof(scancode_rmapping_nonextended) / sizeof(scancode_rmapping_nonextended[0]); i++) {
inverted_scancode_table[scancode_rmapping_extended[i][0]] = inverted_scancode_table[scancode_rmapping_extended[i][1]];
inverted_scancode_table[scancode_rmapping_extended[i][1]] += 0x100;
}
}
static void gfx_sdl_set_fullscreen_changed_callback(void (*on_fullscreen_changed)(bool is_now_fullscreen)) {
on_fullscreen_changed_callback = on_fullscreen_changed;
}
static void gfx_sdl_set_fullscreen(bool enable) {
set_fullscreen(enable, true);
}
static void gfx_sdl_set_keyboard_callbacks(bool (*on_key_down)(int scancode), bool (*on_key_up)(int scancode), void (*on_all_keys_up)(void)) {
on_key_down_callback = on_key_down;
on_key_up_callback = on_key_up;
on_all_keys_up_callback = on_all_keys_up;
}
static void gfx_sdl_main_loop(void (*run_one_game_iter)(void)) {
while (1) {
run_one_game_iter();
}
}
static void gfx_sdl_get_dimensions(uint32_t *width, uint32_t *height) {
*width = window_width;
*height = window_height;
}
static int translate_scancode(int scancode) {
if (scancode < 512) {
return inverted_scancode_table[scancode];
} else {
return 0;
}
}
static void gfx_sdl_onkeydown(int scancode) {
int key = translate_scancode(scancode);
if (on_key_down_callback != NULL) {
on_key_down_callback(key);
}
}
static void gfx_sdl_onkeyup(int scancode) {
int key = translate_scancode(scancode);
if (on_key_up_callback != NULL) {
on_key_up_callback(key);
}
}
static void gfx_sdl_handle_events(void) {
SDL_Event event;
while (SDL_PollEvent(&event)) {
switch (event.type) {
#ifndef TARGET_WEB
// Scancodes are broken in Emscripten SDL2: https://bugzilla.libsdl.org/show_bug.cgi?id=3259
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_F10) {
set_fullscreen(!fullscreen_state, true);
break;
}
gfx_sdl_onkeydown(event.key.keysym.scancode);
break;
case SDL_KEYUP:
gfx_sdl_onkeyup(event.key.keysym.scancode);
break;
#endif
case SDL_WINDOWEVENT:
if (event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
window_width = event.window.data1;
window_height = event.window.data2;
}
break;
case SDL_QUIT:
exit(0);
}
}
}
static bool gfx_sdl_start_frame(void) {
return true;
}
static void sync_framerate_with_timer(void) {
// Number of milliseconds a frame should take (30 fps)
const Uint32 FRAME_TIME = 1000 / 30;
static Uint32 last_time;
Uint32 elapsed = SDL_GetTicks() - last_time;
if (elapsed < FRAME_TIME)
SDL_Delay(FRAME_TIME - elapsed);
last_time += FRAME_TIME;
}
static void gfx_sdl_swap_buffers_begin(void) {
if (!vsync_enabled) {
sync_framerate_with_timer();
}
SDL_GL_SwapWindow(wnd);
}
static void gfx_sdl_swap_buffers_end(void) {
}
static double gfx_sdl_get_time(void) {
return 0.0;
}
struct GfxWindowManagerAPI gfx_sdl = {
gfx_sdl_init,
gfx_sdl_set_keyboard_callbacks,
gfx_sdl_set_fullscreen_changed_callback,
gfx_sdl_set_fullscreen,
gfx_sdl_main_loop,
gfx_sdl_get_dimensions,
gfx_sdl_handle_events,
gfx_sdl_start_frame,
gfx_sdl_swap_buffers_begin,
gfx_sdl_swap_buffers_end,
gfx_sdl_get_time
};
#endif
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