ref: a41d051499b5be820f4eb2a96efb8019bd1fcd53
dir: /src/SDLU.cpp/
///
/// SDLU.c
///
/// SDL utilities.
///
/// John Stiles, 2002/10/12
///
#include "stdafx.h"
#include "SDLU.h"
#include "gameticks.h"
#include "music.h"
#include "main.h" // for Error
#include <deque>
using std::deque;
// for acquiresurface
const int 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;
// for event loop
static MBoolean s_isForeground = true;
// for checktyping
struct BufferedKey
{
bool isASCII;
union
{
char ascii;
SDL_Keycode keycode;
} value;
};
static MBoolean s_interestedInTyping = false;
static std::deque<BufferedKey> s_keyBuffer;
// To compute frames per second
static int s_fpsAccumulator = 0;
static int s_fpsSampleStart = 0;
const int k_fpsSampleInterval = 500;
int SDLUi_EventFilter(void*, SDL_Event *event)
{
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.push_back(key);
}
}
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.push_back(key);
}
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();
}
break;
}
}
return 1;
}
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));
}
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 )
{
/* Uint16 table[256];
int index;
for( index=0; index<256; index++ )
{
table[index] = (int)(index * b * 257.0f); // 255 * 257 = 65535
}
SDL_SetWindowGammaRamp(g_window, table, table, table);
*/}
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_keyBuffer.clear();
}
void SDLU_StopWatchingTyping()
{
s_interestedInTyping = false;
}
MBoolean SDLU_CheckASCIITyping(char* ascii)
{
if (!s_keyBuffer.empty() && s_keyBuffer.front().isASCII)
{
*ascii = s_keyBuffer.front().value.ascii;
s_keyBuffer.pop_front();
return true;
}
*ascii = '\0';
return false;
}
MBoolean SDLU_CheckSDLTyping(SDL_Keycode* sdlKey)
{
if (!s_keyBuffer.empty() && !s_keyBuffer.front().isASCII)
{
*sdlKey = s_keyBuffer.front().value.keycode;
s_keyBuffer.pop_front();
return true;
}
*sdlKey = SDLK_UNKNOWN;
return false;
}
static MPoint SDLUi_TranslatePointFromWindowToFrontSurface(MPoint pt)
{
int windowWidth, windowHeight;
SDL_GetWindowSize(g_window, &windowWidth, &windowHeight);
pt.h = pt.h * g_frontSurface->w / windowWidth;
pt.v = pt.v * g_frontSurface->h / windowHeight;
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_UpdateTexture(g_windowTexture, NULL, g_frontSurface->pixels, g_frontSurface->pitch);
SDL_RenderClear(g_renderer);
SDL_RenderCopy(g_renderer, g_windowTexture, NULL, NULL);
SDL_RenderPresent(g_renderer);
s_fpsAccumulator++;
int now = SDL_GetTicks();
int elapsed = now - s_fpsSampleStart;
if (elapsed > k_fpsSampleInterval) {
float fps = s_fpsAccumulator / (elapsed / 1000.0f);
printf("FPS: %.1f\n", fps);
s_fpsAccumulator = 0;
s_fpsSampleStart = now;
}
}