ref: 136de4805728e9baf48582aa9166d934f106b9f6
dir: /src/Backends/Platform/SDL2.cpp/
// Released under the MIT licence.
// See LICENCE.txt for details.
#include "../Misc.h"
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include "SDL.h"
#include "../Rendering.h"
#include "../Shared/SDL.h"
#include "../../Attributes.h"
#define DO_KEY(SDL_KEY, BACKEND_KEY) \
case SDL_KEY: \
keyboard_state[BACKEND_KEY] = event.key.type == SDL_KEYDOWN; \
break;
static bool keyboard_state[BACKEND_KEYBOARD_TOTAL];
static unsigned char *cursor_surface_pixels;
static SDL_Surface *cursor_surface;
static SDL_Cursor *cursor;
static void (*drag_and_drop_callback)(const char *path);
static void (*window_focus_callback)(bool focus);
bool Backend_Init(void (*drag_and_drop_callback_param)(const char *path), void (*window_focus_callback_param)(bool focus))
{
drag_and_drop_callback = drag_and_drop_callback_param;
window_focus_callback = window_focus_callback_param;
if (SDL_Init(SDL_INIT_EVENTS) == 0)
{
if (SDL_InitSubSystem(SDL_INIT_VIDEO) == 0)
{
Backend_PrintInfo("Available SDL video drivers:");
for (int i = 0; i < SDL_GetNumVideoDrivers(); ++i)
Backend_PrintInfo("%s", SDL_GetVideoDriver(i));
const char *driver = SDL_GetCurrentVideoDriver();
if (driver != NULL)
{
Backend_PrintInfo("Selected SDL video driver: %s", driver);
return true;
}
else
{
Backend_PrintError("No SDL video driver initialized!");
}
}
else
{
std::string error_message = std::string("Could not initialise SDL video subsystem: ") + SDL_GetError();
Backend_ShowMessageBox("Fatal error", error_message.c_str());
}
SDL_Quit();
}
else
{
std::string error_message = std::string("Could not initialise SDL: ") + SDL_GetError();
Backend_ShowMessageBox("Fatal error", error_message.c_str());
}
return false;
}
void Backend_Deinit(void)
{
if (cursor != NULL)
SDL_FreeCursor(cursor);
if (cursor_surface != NULL)
SDL_FreeSurface(cursor_surface);
free(cursor_surface_pixels);
SDL_Quit();
}
void Backend_PostWindowCreation(void)
{
}
bool Backend_GetPaths(std::string *module_path, std::string *data_path)
{
#ifdef _WIN32
// SDL_GetBasePath returns a UTF-8 string, but Windows' fopen uses (extended?) ASCII.
// This is apparently a problem for accented characters, as they will make fopen fail.
// So, instead, we rely on argv[0], as that will put the accented characters in a
// format Windows will understand.
(void)module_path;
(void)data_path;
return false;
#else
char *base_path = SDL_GetBasePath();
if (base_path == NULL)
return false;
// Trim the trailing '/'
size_t base_path_length = strlen(base_path);
base_path[base_path_length - 1] = '\0';
*module_path = base_path;
SDL_free(base_path);
*data_path = *module_path + "/data";
return true;
#endif
}
void Backend_HideMouse(void)
{
SDL_ShowCursor(SDL_DISABLE);
}
void Backend_SetWindowIcon(const unsigned char *rgb_pixels, size_t width, size_t height)
{
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormatFrom((void*)rgb_pixels, width, height, 0, width * 3, SDL_PIXELFORMAT_RGB24);
if (surface != NULL)
{
SDL_SetWindowIcon(window, surface);
SDL_FreeSurface(surface);
}
else
{
Backend_PrintError("Couldn't create RGB surface for window icon: %s", SDL_GetError());
}
}
void Backend_SetCursor(const unsigned char *rgba_pixels, size_t width, size_t height)
{
cursor_surface_pixels = (unsigned char*)malloc(width * height * 4);
if (cursor_surface_pixels != NULL)
{
memcpy(cursor_surface_pixels, rgba_pixels, width * height * 4);
cursor_surface = SDL_CreateRGBSurfaceWithFormatFrom(cursor_surface_pixels, width, height, 0, width * 4, SDL_PIXELFORMAT_RGBA32);
if (cursor_surface != NULL)
{
cursor = SDL_CreateColorCursor(cursor_surface, 0, 0);
if (cursor != NULL)
SDL_SetCursor(cursor);
}
}
else
{
Backend_PrintError("Failed to allocate memory for cursor surface");
}
}
void Backend_EnableDragAndDrop(void)
{
SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
}
bool Backend_SystemTask(bool active)
{
if (!active)
if (!SDL_WaitEvent(NULL))
return false;
SDL_Event event;
while (SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_KEYUP:
case SDL_KEYDOWN:
switch (event.key.keysym.sym)
{
DO_KEY(SDLK_a, BACKEND_KEYBOARD_A)
DO_KEY(SDLK_b, BACKEND_KEYBOARD_B)
DO_KEY(SDLK_c, BACKEND_KEYBOARD_C)
DO_KEY(SDLK_d, BACKEND_KEYBOARD_D)
DO_KEY(SDLK_e, BACKEND_KEYBOARD_E)
DO_KEY(SDLK_f, BACKEND_KEYBOARD_F)
DO_KEY(SDLK_g, BACKEND_KEYBOARD_G)
DO_KEY(SDLK_h, BACKEND_KEYBOARD_H)
DO_KEY(SDLK_i, BACKEND_KEYBOARD_I)
DO_KEY(SDLK_j, BACKEND_KEYBOARD_J)
DO_KEY(SDLK_k, BACKEND_KEYBOARD_K)
DO_KEY(SDLK_l, BACKEND_KEYBOARD_L)
DO_KEY(SDLK_m, BACKEND_KEYBOARD_M)
DO_KEY(SDLK_n, BACKEND_KEYBOARD_N)
DO_KEY(SDLK_o, BACKEND_KEYBOARD_O)
DO_KEY(SDLK_p, BACKEND_KEYBOARD_P)
DO_KEY(SDLK_q, BACKEND_KEYBOARD_Q)
DO_KEY(SDLK_r, BACKEND_KEYBOARD_R)
DO_KEY(SDLK_s, BACKEND_KEYBOARD_S)
DO_KEY(SDLK_t, BACKEND_KEYBOARD_T)
DO_KEY(SDLK_u, BACKEND_KEYBOARD_U)
DO_KEY(SDLK_v, BACKEND_KEYBOARD_V)
DO_KEY(SDLK_w, BACKEND_KEYBOARD_W)
DO_KEY(SDLK_x, BACKEND_KEYBOARD_X)
DO_KEY(SDLK_y, BACKEND_KEYBOARD_Y)
DO_KEY(SDLK_z, BACKEND_KEYBOARD_Z)
DO_KEY(SDLK_0, BACKEND_KEYBOARD_0)
DO_KEY(SDLK_1, BACKEND_KEYBOARD_1)
DO_KEY(SDLK_2, BACKEND_KEYBOARD_2)
DO_KEY(SDLK_3, BACKEND_KEYBOARD_3)
DO_KEY(SDLK_4, BACKEND_KEYBOARD_4)
DO_KEY(SDLK_5, BACKEND_KEYBOARD_5)
DO_KEY(SDLK_6, BACKEND_KEYBOARD_6)
DO_KEY(SDLK_7, BACKEND_KEYBOARD_7)
DO_KEY(SDLK_8, BACKEND_KEYBOARD_8)
DO_KEY(SDLK_9, BACKEND_KEYBOARD_9)
DO_KEY(SDLK_F1, BACKEND_KEYBOARD_F1)
DO_KEY(SDLK_F2, BACKEND_KEYBOARD_F2)
DO_KEY(SDLK_F3, BACKEND_KEYBOARD_F3)
DO_KEY(SDLK_F4, BACKEND_KEYBOARD_F4)
DO_KEY(SDLK_F5, BACKEND_KEYBOARD_F5)
DO_KEY(SDLK_F6, BACKEND_KEYBOARD_F6)
DO_KEY(SDLK_F7, BACKEND_KEYBOARD_F7)
DO_KEY(SDLK_F8, BACKEND_KEYBOARD_F8)
DO_KEY(SDLK_F9, BACKEND_KEYBOARD_F9)
DO_KEY(SDLK_F10, BACKEND_KEYBOARD_F10)
DO_KEY(SDLK_F11, BACKEND_KEYBOARD_F11)
DO_KEY(SDLK_F12, BACKEND_KEYBOARD_F12)
DO_KEY(SDLK_UP, BACKEND_KEYBOARD_UP)
DO_KEY(SDLK_DOWN, BACKEND_KEYBOARD_DOWN)
DO_KEY(SDLK_LEFT, BACKEND_KEYBOARD_LEFT)
DO_KEY(SDLK_RIGHT, BACKEND_KEYBOARD_RIGHT)
DO_KEY(SDLK_ESCAPE, BACKEND_KEYBOARD_ESCAPE)
DO_KEY(SDLK_BACKQUOTE, BACKEND_KEYBOARD_BACK_QUOTE)
DO_KEY(SDLK_TAB, BACKEND_KEYBOARD_TAB)
DO_KEY(SDLK_CAPSLOCK, BACKEND_KEYBOARD_CAPS_LOCK)
DO_KEY(SDLK_LSHIFT, BACKEND_KEYBOARD_LEFT_SHIFT)
DO_KEY(SDLK_LCTRL, BACKEND_KEYBOARD_LEFT_CTRL)
DO_KEY(SDLK_LALT, BACKEND_KEYBOARD_LEFT_ALT)
DO_KEY(SDLK_SPACE, BACKEND_KEYBOARD_SPACE)
DO_KEY(SDLK_RALT, BACKEND_KEYBOARD_RIGHT_ALT)
DO_KEY(SDLK_RCTRL, BACKEND_KEYBOARD_RIGHT_CTRL)
DO_KEY(SDLK_RSHIFT, BACKEND_KEYBOARD_RIGHT_SHIFT)
DO_KEY(SDLK_RETURN, BACKEND_KEYBOARD_ENTER)
DO_KEY(SDLK_BACKSPACE, BACKEND_KEYBOARD_BACKSPACE)
DO_KEY(SDLK_MINUS, BACKEND_KEYBOARD_MINUS)
DO_KEY(SDLK_EQUALS, BACKEND_KEYBOARD_EQUALS)
DO_KEY(SDLK_LEFTBRACKET, BACKEND_KEYBOARD_LEFT_BRACKET)
DO_KEY(SDLK_RIGHTBRACKET, BACKEND_KEYBOARD_RIGHT_BRACKET)
DO_KEY(SDLK_BACKSLASH, BACKEND_KEYBOARD_BACK_SLASH)
DO_KEY(SDLK_SEMICOLON, BACKEND_KEYBOARD_SEMICOLON)
DO_KEY(SDLK_QUOTE, BACKEND_KEYBOARD_APOSTROPHE)
DO_KEY(SDLK_COMMA, BACKEND_KEYBOARD_COMMA)
DO_KEY(SDLK_PERIOD, BACKEND_KEYBOARD_PERIOD)
DO_KEY(SDLK_SLASH, BACKEND_KEYBOARD_FORWARD_SLASH)
default:
break;
}
break;
case SDL_JOYDEVICEADDED:
ControllerBackend_JoystickConnect(event.jdevice.which);
break;
case SDL_JOYDEVICEREMOVED:
ControllerBackend_JoystickDisconnect(event.jdevice.which);
break;
case SDL_DROPFILE:
drag_and_drop_callback(event.drop.file);
SDL_free(event.drop.file);
break;
case SDL_WINDOWEVENT:
switch (event.window.event)
{
case SDL_WINDOWEVENT_FOCUS_LOST:
window_focus_callback(false);
break;
case SDL_WINDOWEVENT_FOCUS_GAINED:
window_focus_callback(true);
break;
case SDL_WINDOWEVENT_RESIZED:
case SDL_WINDOWEVENT_SIZE_CHANGED:
RenderBackend_HandleWindowResize(event.window.data1, event.window.data2);
break;
}
break;
case SDL_QUIT:
return false;
case SDL_RENDER_TARGETS_RESET:
RenderBackend_HandleRenderTargetLoss();
break;
}
}
return true;
}
void Backend_GetKeyboardState(bool *out_keyboard_state)
{
memcpy(out_keyboard_state, keyboard_state, sizeof(keyboard_state));
}
void Backend_ShowMessageBox(const char *title, const char *message)
{
Backend_PrintInfo("ShowMessageBox - '%s' - '%s'\n", title, message);
if (SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, title, message, window) != 0)
Backend_PrintError("Was also unable to display a message box containing the error: %s", SDL_GetError());
}
ATTRIBUTE_FORMAT_PRINTF(1, 2) void Backend_PrintError(const char *format, ...)
{
va_list argumentList;
va_start(argumentList, format);
fputs("ERROR: ", stderr);
vfprintf(stderr, format, argumentList);
fputc('\n', stderr);
va_end(argumentList);
}
ATTRIBUTE_FORMAT_PRINTF(1, 2) void Backend_PrintInfo(const char *format, ...)
{
va_list argumentList;
va_start(argumentList, format);
fputs("INFO: ", stdout);
vfprintf(stdout, format, argumentList);
fputc('\n', stdout);
va_end(argumentList);
}
unsigned long Backend_GetTicks(void)
{
return SDL_GetTicks();
}
void Backend_Delay(unsigned int ticks)
{
SDL_Delay(ticks);
}