ref: 1fcb507e98d51bbf6c03967964d02f3c621daf6c
dir: /src/SDLU.c/
///
/// SDLU.c
///
/// SDL utilities.
///
/// John Stiles, 2002/10/12
///
#include "SDLU.h"
#include "gameticks.h"
#include "music.h"
#include "main.h" // for Error
// for acquiresurface
#define k_acquireMax 10
static int s_acquireHead = -1;
static SDL_Surface* s_acquireList[k_acquireMax];
// for initsurface
static SDL_Palette* s_grayscalePalette;
// for button and getmouse
static int s_mouseButton;
static MPoint s_mousePosition;
// system mouse cursors
static SDL_Cursor* s_standardCursor = NULL;
static SDL_Cursor* s_handCursor = NULL;
// for event loop
static MBoolean s_isForeground = true;
// for fade out / fade in
static float s_fadeGamma = 1;
// for checktyping
typedef struct BufferedKey
{
bool isASCII;
union
{
char ascii;
SDL_Keycode keycode;
} value;
} BufferedKey;
#define k_maxBufferedKeys 256
static MBoolean s_interestedInTyping = false;
static BufferedKey s_keyBuffer[k_maxBufferedKeys];
static int s_keyBufferSize = 0;
int SDLUi_EventFilter(void* junk, SDL_Event *event)
{
(void) junk;
switch (event->type)
{
case SDL_TEXTINPUT:
{
// Put text input into a buffer.
if (s_interestedInTyping)
{
for (char* asciiPtr = event->text.text; *asciiPtr; ++asciiPtr)
{
BufferedKey key;
key.isASCII = true;
key.value.ascii = *asciiPtr;
s_keyBuffer[s_keyBufferSize] = key;
s_keyBufferSize = MinInt(k_maxBufferedKeys, s_keyBufferSize + 1);
}
}
break;
}
case SDL_KEYDOWN:
{
// Put keydowns in a buffer
if (s_interestedInTyping)
{
BufferedKey key;
key.isASCII = false;
key.value.keycode = event->key.keysym.sym;
s_keyBuffer[s_keyBufferSize] = key;
s_keyBufferSize = MinInt(k_maxBufferedKeys, s_keyBufferSize + 1);
}
break;
}
// Get mouse state
case SDL_MOUSEBUTTONDOWN:
{
if( event->button.button == SDL_BUTTON_LEFT )
s_mouseButton = true;
s_mousePosition.v = event->button.y;
s_mousePosition.h = event->button.x;
break;
}
case SDL_MOUSEBUTTONUP:
{
if( event->button.button == SDL_BUTTON_LEFT )
s_mouseButton = false;
s_mousePosition.v = event->button.y;
s_mousePosition.h = event->button.x;
break;
}
case SDL_MOUSEMOTION:
{
s_mousePosition.v = event->motion.y;
s_mousePosition.h = event->motion.x;
s_mouseButton = event->motion.state & SDL_BUTTON(1);
break;
}
case SDL_QUIT:
{
finished = true;
break;
}
case SDL_WINDOWEVENT:
{
if (event->window.event == SDL_WINDOWEVENT_FOCUS_LOST && s_isForeground)
{
FreezeGameTickCount();
//EnableMusic(false);
s_isForeground = false;
}
else if (event->window.event == SDL_WINDOWEVENT_FOCUS_GAINED && !s_isForeground)
{
UnfreezeGameTickCount();
//EnableMusic(musicOn);
s_isForeground = true;
DoFullRepaint();
}
else if (event->window.event == SDL_WINDOWEVENT_RESIZED)
{
SDLU_CreateRendererTexture();
}
break;
}
}
return 1;
}
void SDLU_CreateRendererTexture()
{
if (!g_renderer)
return;
if (!crispUpscaling)
{
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "best");
SDL_RenderSetIntegerScale(g_renderer, SDL_FALSE);
}
else
{
int minWidth = 640;
int minHeight = widescreen ? 360 : 480;
int currentWidth = 0;
int currentHeight = 0;
#if SDL_VERSION_ATLEAST(2,26,0)
SDL_GetWindowSizeInPixels(g_window, ¤tWidth, ¤tHeight);
#else
SDL_GetWindowSize(g_window, ¤tWidth, ¤tHeight);
#endif
if (currentWidth < minWidth || currentHeight < minHeight)
{
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "best");
SDL_RenderSetIntegerScale(g_renderer, SDL_FALSE);
}
else
{
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "0");
SDL_RenderSetIntegerScale(g_renderer, SDL_TRUE);
}
}
if (g_windowTexture)
SDL_DestroyTexture(g_windowTexture);
g_windowTexture = SDL_CreateTexture(g_renderer,
SDL_PIXELFORMAT_RGB888,
SDL_TEXTUREACCESS_STREAMING,
640, 480);
SDL_RenderSetLogicalSize(g_renderer, 640, widescreen ? 360: 480);
}
void SDLU_Init()
{
SDL_SetEventFilter(SDLUi_EventFilter, NULL);
// Initialize eight bit grayscale ramp palette.
SDL_Color grayscaleColors[256];
for (int index=0; index<256; index++)
{
grayscaleColors[index].r =
grayscaleColors[index].g =
grayscaleColors[index].b = 255 - index;
grayscaleColors[index].a = 255;
}
s_grayscalePalette = SDL_AllocPalette(256);
SDL_SetPaletteColors(s_grayscalePalette, grayscaleColors, 0, arrsize(grayscaleColors));
s_standardCursor = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW);
s_handCursor = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_HAND);
}
SDL_Rect* SDLU_MRectToSDLRect( const MRect* in, SDL_Rect* out )
{
int t = in->top, l = in->left, b = in->bottom, r = in->right;
out->x = l;
out->y = t;
out->w = r - l;
out->h = b - t;
return out;
}
MRect* SDLU_SDLRectToMRect( const SDL_Rect* in, MRect* out )
{
int x = in->x, y = in->y, w = in->w, h = in->h;
out->top = y;
out->left = x;
out->bottom = y + h;
out->right = x + w;
return out;
}
int SDLU_BlitSurface( SDL_Surface* src, SDL_Rect* srcrect,
SDL_Surface* dst, SDL_Rect* dstrect )
{
// Let SDL handle this.
return SDL_BlitSurface( src, srcrect,
dst, dstrect );
}
void SDLU_GetPixel( SDL_Surface* surface, int x, int y, SDL_Color* pixel )
{
unsigned int px;
unsigned char* ptr;
switch( surface->format->BytesPerPixel )
{
case 1:
ptr = (unsigned char*)surface->pixels + (y * surface->pitch) + (x);
px = *(unsigned char*) ptr;
break;
case 2:
ptr = (unsigned char*)surface->pixels + (y * surface->pitch) + (x * 2);
px = *(unsigned short*) ptr;
break;
case 4:
ptr = (unsigned char*)surface->pixels + (y * surface->pitch) + (x * 4);
px = *(unsigned int *) ptr;
break;
default:
Error("SDLU_GetPixel: unrecognized surface format");
return;
}
return SDL_GetRGB( px, surface->format, &pixel->r, &pixel->g, &pixel->b );
}
void SDLU_ChangeSurfaceDepth( SDL_Surface** surface, int depth )
{
SDL_Surface* newSurface;
newSurface = SDLU_InitSurface( &surface[0]->clip_rect, depth );
SDLU_BlitSurface( *surface, &surface[0]->clip_rect,
newSurface, &newSurface->clip_rect );
SDL_FreeSurface( *surface );
*surface = newSurface;
}
SDL_Surface* SDLU_InitSurface( SDL_Rect* rect, int depth )
{
SDL_Surface* surface = NULL;
switch( depth )
{
case 32:
surface = SDL_CreateRGBSurface(
SDL_SWSURFACE,
rect->w,
rect->h,
32,
RED_MASK, GREEN_MASK, BLUE_MASK, 0);
break;
case 8:
surface = SDL_CreateRGBSurface(
SDL_SWSURFACE,
rect->w,
rect->h,
8,
0, 0, 0, 0 );
SDL_SetSurfacePalette(surface, s_grayscalePalette);
break;
default:
Error("SDLU_InitSurface: invalid depth");
return NULL;
}
if( surface == NULL )
{
Error( "SDLU_InitSurface: SDL_CreateRGBSurface" );
return NULL;
}
// SDL_FillRect only works on 8-bit or higher surfaces.
if( depth >= 8 )
SDL_FillRect( surface, rect, SDL_MapRGB( surface->format, 0xFF, 0xFF, 0xFF ) );
return surface;
}
void SDLU_BlitFrontSurface( SDL_Surface* source, SDL_Rect* sourceSDLRect, SDL_Rect* destSDLRect )
{
SDLU_BlitSurface( source, sourceSDLRect,
g_frontSurface, destSDLRect );
}
void SDLU_SetBrightness( float b )
{
s_fadeGamma = b;
}
void SDLU_Yield()
{
SDL_Delay( 2 );
SDL_PumpEvents();
}
void SDLU_PumpEvents()
{
static unsigned int lastPump = 0;
unsigned int time = MTickCount();
if( lastPump != time )
{
SDL_Event evt;
while( SDL_PollEvent( &evt ) ) { }
lastPump = time;
}
}
MBoolean SDLU_IsForeground()
{
return s_isForeground;
}
void SDLU_StartWatchingTyping()
{
s_interestedInTyping = true;
s_keyBufferSize = 0; // clear keybuffer
}
void SDLU_StopWatchingTyping()
{
s_interestedInTyping = false;
}
MBoolean SDLU_CheckASCIITyping(char* ascii)
{
if (s_keyBufferSize > 0 && s_keyBuffer[0].isASCII)
{
*ascii = s_keyBuffer[0].value.ascii;
s_keyBufferSize--;
SDL_memcpy(&s_keyBuffer[0], &s_keyBuffer[1], (s_keyBufferSize) * sizeof(BufferedKey));
return true;
}
*ascii = '\0';
return false;
}
MBoolean SDLU_CheckSDLTyping(SDL_Keycode* sdlKey)
{
if (s_keyBufferSize > 0 && !s_keyBuffer[0].isASCII)
{
*sdlKey = s_keyBuffer[0].value.keycode;
s_keyBufferSize--;
SDL_memcpy(&s_keyBuffer[0], &s_keyBuffer[1], (s_keyBufferSize) * sizeof(BufferedKey));
return true;
}
*sdlKey = SDLK_UNKNOWN;
return false;
}
static MPoint SDLUi_TranslatePointFromWindowToFrontSurface(MPoint pt)
{
// On macOS, the mouse position is relative to the window's "point size" on Retina screens.
int windowPointW = 1;
int windowPointH = 1;
int windowPixelW = 1;
int windowPixelH = 1;
SDL_GetWindowSize(g_window, &windowPointW, &windowPointH);
#if SDL_VERSION_ATLEAST(2,26,0)
SDL_GetWindowSizeInPixels(g_window, &windowPixelW, &windowPixelH);
#else
// Backwards compat with old versions of SDL
windowPixelW = windowPointW;
windowPixelH = windowPointH;
#endif
if (windowPointW != windowPixelW || windowPointH != windowPixelH)
{
float dpiScaleX = (float) windowPixelW / (float) windowPointW; // gGameWindowWidth is in actual pixels
float dpiScaleY = (float) windowPixelH / (float) windowPointH; // gGameWindowHeight is in actual pixels
pt.h *= dpiScaleX;
pt.v *= dpiScaleY;
}
SDL_Rect viewport;
float scaleX, scaleY;
SDL_RenderGetViewport(g_renderer, &viewport);
SDL_RenderGetScale(g_renderer, &scaleX, &scaleY);
pt.h = pt.h / scaleX - viewport.x;
pt.v = pt.v / scaleY - viewport.y;
if (widescreen)
{
pt.h += g_widescreenCrop.x;
pt.v += g_widescreenCrop.y;
}
return pt;
}
void SDLU_GetMouse( MPoint* pt )
{
SDLU_PumpEvents();
*pt = SDLUi_TranslatePointFromWindowToFrontSurface(s_mousePosition);
}
int SDLU_Button()
{
SDLU_PumpEvents();
return s_mouseButton;
}
void SDLU_AcquireSurface( SDL_Surface* surface )
{
if (s_acquireHead >= arrsize(s_acquireList) - 1)
Error("SDLU_AcquireSurface: overflow");
s_acquireList[++s_acquireHead] = surface;
}
SDL_Surface* SDLU_GetCurrentSurface()
{
return s_acquireList[s_acquireHead];
}
void SDLU_ReleaseSurface( SDL_Surface* surface )
{
if (s_acquireHead < 0)
Error( "SDLU_ReleaseSurface: underflow" );
if( s_acquireList[s_acquireHead] != surface )
Error( "SDLU_ReleaseSurface: out of order" );
s_acquireHead--;
}
void SDLU_Present()
{
SDL_SetRenderDrawColor(g_renderer, 0, 0, 0, 255);
SDL_UpdateTexture(g_windowTexture, NULL, g_frontSurface->pixels, g_frontSurface->pitch);
SDL_RenderClear(g_renderer);
SDL_RenderCopy(g_renderer, g_windowTexture, widescreen ? &g_widescreenCrop : NULL, NULL);
if (s_fadeGamma < 1.0)
{
SDL_SetRenderDrawBlendMode(g_renderer, SDL_BLENDMODE_BLEND);
SDL_SetRenderDrawColor(g_renderer, 0, 0, 0, (Uint8)((1.0f - s_fadeGamma) * 255.0f));
SDL_RenderFillRect(g_renderer, NULL);
}
SDL_RenderPresent(g_renderer);
#if 0
static int s_fpsAccumulator = 0;
static int s_fpsSampleStart = 0;
const int k_fpsSampleInterval = 500;
s_fpsAccumulator++;
int now = SDL_GetTicks();
int elapsed = now - s_fpsSampleStart;
if (elapsed > k_fpsSampleInterval)
{
float fps = s_fpsAccumulator / (elapsed / 1000.0f);
#if _DEBUG
printf("FPS: %.1f\n", fps);
#endif
s_fpsAccumulator = 0;
s_fpsSampleStart = now;
}
#endif
}
void SDLU_SetSystemCursor(int which)
{
#if USE_CURSOR_SPRITE
SDL_ShowCursor(SDL_DISABLE);
#else
switch (which)
{
case SYSTEM_CURSOR_OFF:
SDL_ShowCursor(SDL_DISABLE);
SDL_SetCursor(s_standardCursor);
break;
case SYSTEM_CURSOR_ARROW:
SDL_SetCursor(s_standardCursor);
SDL_ShowCursor(SDL_ENABLE);
break;
case SYSTEM_CURSOR_HAND:
SDL_SetCursor(s_handCursor);
SDL_ShowCursor(SDL_ENABLE);
break;
}
#endif
}