/*
* Add controller mappings from the specified file
*/
void S2D_AddControllerMappingsFromFile(const char *path) {
if (!S2D_FileExists(path)) {
S2D_Log(S2D_WARN, "Controller mappings file not found: %s", path);
return;
}
int mappings_added = SDL_GameControllerAddMappingsFromFile(path);
if (mappings_added == -1) {
S2D_Error("SDL_GameControllerAddMappingsFromFile", SDL_GetError());
} else {
S2D_Log(S2D_INFO, "Added %i controller mapping(s)", mappings_added);
}
}
/*
* Open controllers and joysticks
*/
void S2D_OpenControllers() {
char guid_str[33];
// Enumerate joysticks
for (int device_index = 0; device_index < SDL_NumJoysticks(); ++device_index) {
// Check if joystick supports SDL's game controller interface (a mapping is available)
if (SDL_IsGameController(device_index)) {
SDL_GameController *controller = SDL_GameControllerOpen(device_index);
SDL_JoystickID intance_id = SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(controller));
SDL_JoystickGetGUIDString(
SDL_JoystickGetGUID(SDL_GameControllerGetJoystick(controller)),
guid_str, 33
);
if (intance_id > last_intance_id) {
if (controller) {
S2D_Log(S2D_INFO, "Controller #%i: %s\n GUID: %s", intance_id, SDL_GameControllerName(controller), guid_str);
} else {
S2D_Log(S2D_ERROR, "Could not open controller #%i: %s", intance_id, SDL_GetError());
}
last_intance_id = intance_id;
}
// Controller interface not supported, try to open as joystick
} else {
SDL_Joystick *joy = SDL_JoystickOpen(device_index);
SDL_JoystickID intance_id = SDL_JoystickInstanceID(joy);
if (!joy) {
S2D_Log(S2D_ERROR, "Could not open controller");
} else if(intance_id > last_intance_id) {
SDL_JoystickGetGUIDString(
SDL_JoystickGetGUID(joy),
guid_str, 33
);
S2D_Log(S2D_INFO,
"Controller #%i: %s\n GUID: %s\n Axes: %d\n Buttons: %d\n Balls: %d",
intance_id, SDL_JoystickName(joy), guid_str, SDL_JoystickNumAxes(joy),
SDL_JoystickNumButtons(joy), SDL_JoystickNumBalls(joy)
);
S2D_Log(S2D_WARN, "Controller #%i does not have a mapping available", intance_id);
last_intance_id = intance_id;
}
}
}
}
/*
* Add controller mapping from string
*/
void S2D_AddControllerMapping(const char *map) {
int result = SDL_GameControllerAddMapping(map);
char guid[33];
strncpy(guid, map, 32);
switch (result) {
case 1:
S2D_Log(S2D_INFO, "Mapping added for GUID: %s", guid);
break;
case 0:
S2D_Log(S2D_INFO, "Mapping updated for GUID: %s", guid);
break;
case -1:
S2D_Error("SDL_GameControllerAddMapping", SDL_GetError());
break;
}
}
/*
* Print info about the current OpenGL context
*/
void S2D_GL_PrintContextInfo(S2D_Window *window) {
S2D_Log(S2D_INFO,
"OpenGL Context\n"
" GL_VENDOR: %s\n"
" GL_RENDERER: %s\n"
" GL_VERSION: %s\n"
" GL_SHADING_LANGUAGE_VERSION: %s",
window->S2D_GL_VENDOR,
window->S2D_GL_RENDERER,
window->S2D_GL_VERSION,
window->S2D_GL_SHADING_LANGUAGE_VERSION
);
}
/*
* Create text
*/
Text *S2D_CreateText(const char *font, const char *msg, int size) {
#if GLES
S2D_Log("S2D_DrawText not yet implemented!", S2D_WARN);
#endif
Text *txt;
txt = (Text *)malloc(sizeof(Text));
if(!txt) {
S2D_Error("S2D_CreateText", "Out of memory!");
return NULL;
}
// `msg` cannot be an empty string; if so, return
if (strlen(msg) == 0) {
S2D_Error("S2D_CreateText", "Text message cannot be empty!");
return NULL;
} else {
txt->msg = msg;
}
txt->x = 0;
txt->y = 0;
txt->color.r = 1.0;
txt->color.g = 1.0;
txt->color.b = 1.0;
txt->color.a = 1.0;
txt->texture_id = 0;
txt->font = TTF_OpenFont(font, size);
if (!txt->font) {
S2D_Error("TTF_OpenFont", TTF_GetError());
free(txt);
return NULL;
}
// Save the width and height of the text
TTF_SizeText(txt->font, txt->msg, &txt->w, &txt->h);
SDL_Surface *surface;
SDL_Color color = { 255, 255, 255 };
surface = TTF_RenderText_Blended(txt->font, txt->msg, color);
S2D_GL_SetUpTexture(&txt->texture_id, GL_RGBA, txt->w, txt->h, surface->pixels, GL_NEAREST);
// Free the surface data, no longer needed
SDL_FreeSurface(surface);
return txt;
}
/*
* Close the window, clean up SDL
*/
int S2D_Close(Window *window) {
S2D_Log("Closing S2D", S2D_INFO);
// SDL
IMG_Quit();
Mix_CloseAudio();
Mix_Quit();
TTF_Quit();
SDL_GL_DeleteContext(window->glcontext);
SDL_DestroyWindow(window->sdl);
SDL_Quit();
return 0;
}
/*
* Create an image
*/
Image *S2D_CreateImage(const char *path) {
if(!path)
return NULL;
// TODO: Implement images in GLES
#if GLES
S2D_Log("S2D_DrawImage not yet implemented!", S2D_INFO);
#endif
Image *img;
SDL_Surface *surface;
// Load image from file as SDL_Surface
surface = IMG_Load(path);
if (!surface) {
S2D_Error("IMG_Load", IMG_GetError());
return NULL;
}
img = (Image *)malloc(sizeof(Image));
if(!img) {
S2D_Error("IMG_Load", "Out of memory!");
SDL_FreeSurface(surface);
return NULL;
}
// Initialize values
img->x = 0;
img->y = 0;
img->w = surface->w;
img->h = surface->h;
img->texture_id = 0;
// Detect image mode
// TODO: BMP is in BGR...?
int format = GL_RGB;
if(surface->format->BytesPerPixel == 4) {
format = GL_RGBA;
}
S2D_GL_SetUpTexture(&img->texture_id, format, img->w, img->h, surface->pixels, GL_NEAREST);
// Free the surface data, no longer needed
SDL_FreeSurface(surface);
return img;
}
/*
* Show the window
*/
int S2D_Show(Window *window) {
// Setting up variables
int mouse_x, mouse_y; // Mouse positions
const Uint8 *key_state;
Uint32 frames = 0; // Total frames since start
Uint32 start_ms = SDL_GetTicks(); // Elapsed time since start
Uint32 begin_ms = start_ms; // Time at beginning of loop
Uint32 end_ms; // Time at end of loop
Uint32 elapsed_ms; // Total elapsed time
Uint32 loop_ms; // Elapsed time of loop
int delay_ms; // Amount of delay to achieve desired frame rate
double fps; // The actual frame rate
// Enable VSync
if (window->vsync) {
if (!SDL_SetHint(SDL_HINT_RENDER_VSYNC, "1")) {
S2D_Log("VSync cannot be enabled", S2D_WARN);
}
}
// Detect Controllers and Joysticks //////////////////////////////////////////
if (SDL_NumJoysticks() > 0) {
sprintf(S2D_msg, "Joysticks detected: %i", SDL_NumJoysticks());
S2D_Log(S2D_msg, S2D_INFO);
}
// Variables for controllers and joysticks
SDL_GameController *controller = NULL;
SDL_Joystick *joy = NULL;
// Enumerate joysticks
for (int i = 0; i < SDL_NumJoysticks(); ++i) {
// Check to see if joystick supports SDL's game controller interface
if (SDL_IsGameController(i)) {
controller = SDL_GameControllerOpen(i);
if (controller) {
sprintf(S2D_msg, "Found a valid controller, named: %s\n",
SDL_GameControllerName(controller));
S2D_Log(S2D_msg, S2D_INFO);
break; // Break after first available controller
} else {
sprintf(S2D_msg, "Could not open game controller %i: %s\n", i, SDL_GetError());
S2D_Log(S2D_msg, S2D_ERROR);
}
// Controller interface not supported, try to open as joystick
} else {
sprintf(S2D_msg, "Joystick %i is not supported by the game controller interface", i);
S2D_Log(S2D_msg, S2D_WARN);
joy = SDL_JoystickOpen(i);
// Joystick is valid
if (joy) {
sprintf(S2D_msg,
"Opened Joystick %i\n"
"Name: %s\n"
"Axes: %d\n"
"Buttons: %d\n"
"Balls: %d\n",
i, SDL_JoystickName(joy), SDL_JoystickNumAxes(joy),
SDL_JoystickNumButtons(joy), SDL_JoystickNumBalls(joy)
);
S2D_Log(S2D_msg, S2D_INFO);
// Joystick not valid
} else {
sprintf(S2D_msg, "Could not open Joystick %i", i);
S2D_Log(S2D_msg, S2D_ERROR);
}
break; // Break after first available joystick
}
}
// Main Event Loop ///////////////////////////////////////////////////////////
bool quit = false;
while (!quit) {
// Clear Frame /////////////////////////////////////////////////////////////
S2D_GL_Clear(window->background);
// Set FPS /////////////////////////////////////////////////////////////////
frames++;
end_ms = SDL_GetTicks();
elapsed_ms = end_ms - start_ms;
fps = frames / (elapsed_ms / 1000.0);
loop_ms = end_ms - begin_ms;
delay_ms = (1000 / window->fps_cap) - loop_ms;
if (delay_ms < 0) delay_ms = 0;
// Note: `loop_ms + delay_ms` should equal `1000 / fps_cap`
SDL_Delay(delay_ms);
begin_ms = SDL_GetTicks();
// Handle Input ////////////////////////////////////////////////////////////
SDL_Event e;
while (SDL_PollEvent(&e)) {
switch (e.type) {
case SDL_KEYDOWN:
if (window->on_key)
window->on_key(SDL_GetScancodeName(e.key.keysym.scancode));
break;
case SDL_MOUSEBUTTONDOWN:
if (window->on_mouse)
window->on_mouse(e.button.x, e.button.y);
break;
case SDL_JOYAXISMOTION:
if (window->on_controller)
window->on_controller(true, e.jaxis.axis, e.jaxis.value, false, 0);
break;
case SDL_JOYBUTTONDOWN:
if (window->on_controller)
window->on_controller(false, 0, 0, true, e.jbutton.button);
break;
case SDL_WINDOWEVENT:
switch (e.window.event) {
case SDL_WINDOWEVENT_RESIZED:
S2D_GL_SetView(e.window.data1, e.window.data2, window->width, window->height);
break;
}
break;
case SDL_QUIT:
quit = true;
break;
}
}
// Detect keys held down
int num_keys;
key_state = SDL_GetKeyboardState(&num_keys);
for (int i = 0; i < num_keys; i++) {
if (window->on_key_down) {
if (key_state[i] == 1) {
window->on_key_down(SDL_GetScancodeName(i));
}
}
}
// Store the mouse position
SDL_GetMouseState(&mouse_x, &mouse_y);
// Update Window State /////////////////////////////////////////////////////
// Store new values in the window
window->mouse.x = mouse_x;
window->mouse.y = mouse_y;
window->mouse.real_x = mouse_x;
window->mouse.real_y = mouse_y;
window->frames = frames;
window->elapsed_ms = elapsed_ms;
window->loop_ms = loop_ms;
window->delay_ms = delay_ms;
window->fps = fps;
// scale the mouse position, if necessary
if (window->s_width != window->width) {
window->mouse.x = (int)((double)window->mouse.real_x *
((double)window->s_width / (double)window->width) + 0.5);
}
if (window->s_height != window->height) {
window->mouse.y = (int)((double)window->mouse.real_y *
((double)window->s_height / (double)window->height) + 0.5);
}
// Call update and render callbacks
if (window->update) window->update();
if (window->render) window->render();
// Draw Frame //////////////////////////////////////////////////////////////
SDL_GL_SwapWindow(window->sdl);
}
return 0;
}
/*
* Logs Simple 2D errors to the console, with caller and message body
*/
void S2D_Error(const char *caller, const char *msg) {
sprintf(S2D_msg, "(%s) %s", caller, msg);
S2D_Log(S2D_msg, S2D_ERROR);
}
/*
* Create a window
*/
Window* S2D_CreateWindow(const char *title, int width, int height,
Update update, Render render, int flags) {
// Allocate window and set default values
Window *window = (Window*)malloc(sizeof(Window));
window->title = title;
window->width = width;
window->height = height;
window->fps_cap = 60;
window->vsync = true;
window->update = update;
window->render = render;
window->on_key = NULL;
window->on_key_down = NULL;
window->on_mouse = NULL;
window->on_controller = NULL;
window->background.r = 0.0;
window->background.g = 0.0;
window->background.b = 0.0;
window->background.a = 1.0;
// SDL Initialization ////////////////////////////////////////////////////////
// Initialize SDL
if (SDL_Init(SDL_INIT_EVERYTHING) != 0) S2D_Error("SDL_Init", SDL_GetError());
// Initialize SDL_ttf
if (TTF_Init() != 0) {
S2D_Error("TTF_Init", TTF_GetError());
free(window);
return NULL;
}
// Initialize SDL_mixer
int mix_flags = MIX_INIT_FLAC|MIX_INIT_OGG|MIX_INIT_MP3;
int mix_initted = Mix_Init(mix_flags);
if ((mix_initted&mix_flags) != mix_flags) {
S2D_Error("Mix_Init", Mix_GetError());
}
int audio_rate = 44100;
Uint16 audio_format = AUDIO_S16SYS;
int audio_channels = 2;
int audio_buffers = 4096;
if (Mix_OpenAudio(audio_rate, MIX_DEFAULT_FORMAT, audio_channels, audio_buffers) != 0) {
S2D_Error("Mix_OpenAudio", Mix_GetError());
free(window);
return NULL;
}
// Create SDL window
window->sdl = SDL_CreateWindow(
window->title, // title
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, // window position
window->width, window->height, // window size
SDL_WINDOW_OPENGL | flags // flags
);
if (!window->sdl) S2D_Error("SDL_CreateWindow", SDL_GetError());
// Window created by SDL might not actually be the requested size.
// If not, retrieve and set the actual window size.
window->s_width = window->width;
window->s_height = window->height;
SDL_GetWindowSize(window->sdl, &window->width, &window->height);
if ((window->width != window->s_width) ||
(window->height != window->s_height)) {
sprintf(S2D_msg,
"Resolution %dx%d unsupported by driver, scaling to %dx%d",
window->s_width, window->s_height, window->width, window->height);
S2D_Log(S2D_msg, S2D_WARN);
}
// Init OpenGL / GLES ////////////////////////////////////////////////////////
// Specify the OpenGL Context
#if !GLES
if (FORCE_GL2) {
// Use legacy OpenGL 2.1
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
} else {
// Request an OpenGL 3.3 forward-compatible core profile
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
}
#endif
// Create and store the OpenGL context
if (FORCE_GL2) {
window->glcontext = NULL;
} else {
// Ask SDL to create an OpenGL context
window->glcontext = SDL_GL_CreateContext(window->sdl);
}
// Check if a valid OpenGL context was created
if (window->glcontext) {
// Valid context found
#if GLES
// Initialize OpenGL ES 2.0
gles_init(window->width, window->height, window->s_width, window->s_height);
#else
// Initialize OpenGL 3.3+
gl3_init(window->width, window->height);
#endif
} else {
// Context could not be created
#if GLES
S2D_Error("GLES / SDL_GL_CreateContext", SDL_GetError());
#else
// Try to fallback using an OpenGL 2.1 context
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
// Try creating the context again
window->glcontext = SDL_GL_CreateContext(window->sdl);
// Check if this context was created
if (window->glcontext) {
// Valid context found
S2D_GL2 = true;
gl2_init(window->width, window->height);
} else {
// Could not create any OpenGL contexts, hard failure
S2D_Error("GL2 / SDL_GL_CreateContext", SDL_GetError());
S2D_Log("An OpenGL context could not be created", S2D_ERROR);
free(window);
return NULL;
}
#endif
}
// Store the context and print it if diagnostics is enabled
S2D_GL_StoreContextInfo(window);
if (diagnostics) S2D_GL_PrintContextInfo(window);
return window;
}
/*
* Initialize OpenGL
*/
int S2D_GL_Init(S2D_Window *window) {
// Specify OpenGL contexts and set attributes
#if GLES
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
#else
// Use legacy OpenGL 2.1
if (FORCE_GL2) {
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
// Request an OpenGL 3.3 forward-compatible core profile
} else {
SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
}
#endif
// Create and store the OpenGL context
if (FORCE_GL2) {
window->glcontext = NULL;
} else {
// Ask SDL to create an OpenGL context
window->glcontext = SDL_GL_CreateContext(window->sdl);
}
// Check if a valid OpenGL context was created
if (window->glcontext) {
// Valid context found
// Initialize OpenGL ES 2.0
#if GLES
S2D_GLES_Init();
S2D_GL_SetViewport(window);
// Initialize OpenGL 3.3+
#else
// Initialize GLEW on Windows
#if WINDOWS
GLenum err = glewInit();
if (GLEW_OK != err) S2D_Error("GLEW", glewGetErrorString(err));
#endif
S2D_GL3_Init();
S2D_GL_SetViewport(window);
#endif
// Context could not be created
} else {
#if GLES
S2D_Error("GLES / SDL_GL_CreateContext", SDL_GetError());
#else
// Try to fallback using an OpenGL 2.1 context
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
// Try creating the context again
window->glcontext = SDL_GL_CreateContext(window->sdl);
// Check if this context was created
if (window->glcontext) {
// Valid context found
S2D_GL2 = true;
S2D_GL2_Init();
S2D_GL_SetViewport(window);
// Could not create any OpenGL contexts, hard failure
} else {
S2D_Error("GL2 / SDL_GL_CreateContext", SDL_GetError());
S2D_Log(S2D_ERROR, "An OpenGL context could not be created");
return -1;
}
#endif
}
// Store the context and print it if diagnostics is enabled
S2D_GL_StoreContextInfo(window);
if (S2D_diagnostics) S2D_GL_PrintContextInfo(window);
return 0;
}
/*
* Prints current GL error
*/
void S2D_GL_PrintError(char *error) {
S2D_Log(S2D_ERROR, "%s (%d)", error, glGetError());
}
