mirror of
https://github.com/TerryCavanagh/VVVVVV.git
synced 2024-06-01 18:43:33 +02:00
b7cbdfe8f9
In aa7b63fa5f, I didn't notice that the
result was implicitly being converted to int by the min/max from before.
I instead added it to the existing char, but that resulted in a char
overflow (it's unsigned, so thankfully not undefined behavior).
But of course the entire point of that commit is to make it explicitly
clear when you are converting between types, intentionally or otherwise,
in min/max comparisons. So despite causing a regression (which I have
now fixed), at least it did its job.
496 lines
12 KiB
C++
496 lines
12 KiB
C++
#include "GraphicsUtil.h"
|
|
|
|
#include <SDL.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "Graphics.h"
|
|
#include "Maths.h"
|
|
|
|
|
|
|
|
|
|
void setRect( SDL_Rect& _r, int x, int y, int w, int h )
|
|
{
|
|
_r.x = x;
|
|
_r.y = y;
|
|
_r.w = w;
|
|
_r.h = h;
|
|
}
|
|
|
|
static SDL_Surface* RecreateSurfaceWithDimensions(
|
|
SDL_Surface* surface,
|
|
const int width,
|
|
const int height
|
|
) {
|
|
SDL_Surface* retval;
|
|
SDL_BlendMode blend_mode;
|
|
|
|
if (surface == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
retval = SDL_CreateRGBSurface(
|
|
surface->flags,
|
|
width,
|
|
height,
|
|
surface->format->BitsPerPixel,
|
|
surface->format->Rmask,
|
|
surface->format->Gmask,
|
|
surface->format->Bmask,
|
|
surface->format->Amask
|
|
);
|
|
|
|
if (retval == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
SDL_GetSurfaceBlendMode(surface, &blend_mode);
|
|
SDL_SetSurfaceBlendMode(retval, blend_mode);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static SDL_Surface* RecreateSurface(SDL_Surface* surface)
|
|
{
|
|
if (surface == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
return RecreateSurfaceWithDimensions(
|
|
surface,
|
|
surface->w,
|
|
surface->h
|
|
);
|
|
}
|
|
|
|
SDL_Surface* GetSubSurface( SDL_Surface* metaSurface, int x, int y, int width, int height )
|
|
{
|
|
// Create an SDL_Rect with the area of the _surface
|
|
SDL_Rect area;
|
|
area.x = x;
|
|
area.y = y;
|
|
area.w = width;
|
|
area.h = height;
|
|
|
|
//Convert to the correct display format after nabbing the new _surface or we will slow things down.
|
|
SDL_Surface* preSurface = RecreateSurfaceWithDimensions(
|
|
metaSurface,
|
|
width,
|
|
height
|
|
);
|
|
|
|
// Lastly, apply the area from the meta _surface onto the whole of the sub _surface.
|
|
SDL_BlitSurface(metaSurface, &area, preSurface, 0);
|
|
|
|
// Return the new Bitmap _surface
|
|
return preSurface;
|
|
}
|
|
|
|
static void DrawPixel( SDL_Surface *_surface, int x, int y, Uint32 pixel )
|
|
{
|
|
int bpp = _surface->format->BytesPerPixel;
|
|
/* Here p is the address to the pixel we want to set */
|
|
Uint8 *p = (Uint8 *)_surface->pixels + y * _surface->pitch + x * bpp;
|
|
|
|
switch(bpp)
|
|
{
|
|
case 1:
|
|
*p = pixel;
|
|
break;
|
|
|
|
case 2:
|
|
*(Uint16 *)p = pixel;
|
|
break;
|
|
|
|
case 3:
|
|
p[0] = (pixel >> 16) & 0xff;
|
|
p[1] = (pixel >> 8) & 0xff;
|
|
p[2] = pixel & 0xff;
|
|
break;
|
|
|
|
case 4:
|
|
*(Uint32 *)p = pixel;
|
|
break;
|
|
}
|
|
}
|
|
|
|
Uint32 ReadPixel( SDL_Surface *_surface, int x, int y )
|
|
{
|
|
int bpp = _surface->format->BytesPerPixel;
|
|
/* Here p is the address to the pixel we want to retrieve */
|
|
Uint8 *p = (Uint8 *)_surface->pixels + y * _surface->pitch + x * bpp;
|
|
|
|
switch(bpp)
|
|
{
|
|
case 1:
|
|
return *p;
|
|
break;
|
|
|
|
case 2:
|
|
return *(Uint16 *)p;
|
|
break;
|
|
|
|
case 3:
|
|
return p[0] | p[1] << 8 | p[2] << 16;
|
|
|
|
case 4:
|
|
return *(Uint32 *)p;
|
|
break;
|
|
|
|
default:
|
|
return 0; /* shouldn't happen, but avoids warnings */
|
|
}
|
|
}
|
|
|
|
SDL_Surface * ScaleSurface( SDL_Surface *_surface, int Width, int Height, SDL_Surface * Dest )
|
|
{
|
|
if(!_surface || !Width || !Height)
|
|
return 0;
|
|
|
|
SDL_Surface *_ret;
|
|
if(Dest == NULL)
|
|
{
|
|
_ret = RecreateSurfaceWithDimensions(_surface, Width, Height);
|
|
if(_ret == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
_ret = Dest;
|
|
}
|
|
|
|
SDL_BlitScaled(_surface, NULL, _ret, NULL);
|
|
|
|
return _ret;
|
|
}
|
|
|
|
SDL_Surface * FlipSurfaceVerticle(SDL_Surface* _src)
|
|
{
|
|
SDL_Surface * ret = RecreateSurface(_src);
|
|
if(ret == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
for(Sint32 y = 0; y < _src->h; y++)
|
|
{
|
|
for(Sint32 x = 0; x < _src->w; x++)
|
|
{
|
|
DrawPixel(ret, x ,(_src->h-1) - y ,ReadPixel(_src, x, y));
|
|
}
|
|
|
|
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void BlitSurfaceStandard( SDL_Surface* _src, SDL_Rect* _srcRect, SDL_Surface* _dest, SDL_Rect* _destRect )
|
|
{
|
|
SDL_BlitSurface( _src, _srcRect, _dest, _destRect );
|
|
}
|
|
|
|
void BlitSurfaceColoured(
|
|
SDL_Surface* _src,
|
|
SDL_Rect* _srcRect,
|
|
SDL_Surface* _dest,
|
|
SDL_Rect* _destRect,
|
|
colourTransform& ct
|
|
) {
|
|
SDL_Rect *tempRect = _destRect;
|
|
|
|
const SDL_PixelFormat& fmt = *(_src->format);
|
|
|
|
SDL_Surface* tempsurface = RecreateSurface(_src);
|
|
|
|
for(int x = 0; x < tempsurface->w; x++)
|
|
{
|
|
for(int y = 0; y < tempsurface->h; y++)
|
|
{
|
|
Uint32 pixel = ReadPixel(_src, x, y);
|
|
Uint32 Alpha = pixel & fmt.Amask;
|
|
Uint32 result = ct.colour & 0x00FFFFFF;
|
|
Uint32 CTAlpha = ct.colour & fmt.Amask;
|
|
float div1 = ((Alpha >> 24) / 255.0f);
|
|
float div2 = ((CTAlpha >> 24) / 255.0f);
|
|
Uint32 UseAlpha = (div1 * div2) * 255.0f;
|
|
DrawPixel(tempsurface, x, y, result | (UseAlpha << 24));
|
|
}
|
|
}
|
|
|
|
SDL_BlitSurface(tempsurface, _srcRect, _dest, tempRect);
|
|
SDL_FreeSurface(tempsurface);
|
|
}
|
|
|
|
void BlitSurfaceTinted(
|
|
SDL_Surface* _src,
|
|
SDL_Rect* _srcRect,
|
|
SDL_Surface* _dest,
|
|
SDL_Rect* _destRect,
|
|
colourTransform& ct
|
|
) {
|
|
SDL_Rect *tempRect = _destRect;
|
|
|
|
const SDL_PixelFormat& fmt = *(_src->format);
|
|
|
|
SDL_Surface* tempsurface = RecreateSurface(_src);
|
|
|
|
for (int x = 0; x < tempsurface->w; x++) {
|
|
for (int y = 0; y < tempsurface->h; y++) {
|
|
Uint32 pixel = ReadPixel(_src, x, y);
|
|
|
|
Uint8 pixred = (pixel & _src->format->Rmask) >> 16;
|
|
Uint8 pixgreen = (pixel & _src->format->Gmask) >> 8;
|
|
Uint8 pixblue = (pixel & _src->format->Bmask) >> 0;
|
|
|
|
double temp_pixred = pixred * 0.299;
|
|
double temp_pixgreen = pixgreen * 0.587;
|
|
double temp_pixblue = pixblue * 0.114;
|
|
|
|
double gray = SDL_floor((temp_pixred + temp_pixgreen + temp_pixblue + 0.5));
|
|
|
|
Uint8 ctred = (ct.colour & graphics.backBuffer->format->Rmask) >> 16;
|
|
Uint8 ctgreen = (ct.colour & graphics.backBuffer->format->Gmask) >> 8;
|
|
Uint8 ctblue = (ct.colour & graphics.backBuffer->format->Bmask) >> 0;
|
|
|
|
temp_pixred = gray * ctred / 255.0;
|
|
temp_pixgreen = gray * ctgreen / 255.0;
|
|
temp_pixblue = gray * ctblue / 255.0;
|
|
|
|
if (temp_pixred > 255)
|
|
temp_pixred = 255;
|
|
if (temp_pixgreen > 255)
|
|
temp_pixgreen = 255;
|
|
if (temp_pixblue > 255)
|
|
temp_pixblue = 255;
|
|
|
|
pixred = temp_pixred;
|
|
pixgreen = temp_pixgreen;
|
|
pixblue = temp_pixblue;
|
|
|
|
Uint32 Alpha = pixel & fmt.Amask;
|
|
Uint32 result = (pixred << 16) + (pixgreen << 8) + (pixblue << 0);
|
|
Uint32 CTAlpha = ct.colour & fmt.Amask;
|
|
float div1 = ((Alpha >> 24) / 255.0f);
|
|
float div2 = ((CTAlpha >> 24) / 255.0f);
|
|
Uint32 UseAlpha = (div1 * div2) * 255.0f;
|
|
|
|
DrawPixel(tempsurface, x, y, result | (UseAlpha << 24));
|
|
}
|
|
}
|
|
|
|
SDL_BlitSurface(tempsurface, _srcRect, _dest, tempRect);
|
|
SDL_FreeSurface(tempsurface);
|
|
}
|
|
|
|
|
|
static int oldscrollamount = 0;
|
|
static int scrollamount = 0;
|
|
static bool isscrolling = 0;
|
|
|
|
void UpdateFilter(void)
|
|
{
|
|
if (rand() % 4000 < 8)
|
|
{
|
|
isscrolling = true;
|
|
}
|
|
|
|
oldscrollamount = scrollamount;
|
|
if(isscrolling == true)
|
|
{
|
|
scrollamount += 20;
|
|
if(scrollamount > 240)
|
|
{
|
|
scrollamount = 0;
|
|
oldscrollamount = 0;
|
|
isscrolling = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
SDL_Surface* ApplyFilter( SDL_Surface* _src )
|
|
{
|
|
SDL_Surface* _ret = RecreateSurface(_src);
|
|
|
|
int redOffset = rand() % 4;
|
|
|
|
for(int x = 0; x < _src->w; x++)
|
|
{
|
|
for(int y = 0; y < _src->h; y++)
|
|
{
|
|
int sampley = (y + (int) graphics.lerp(oldscrollamount, scrollamount) )% 240;
|
|
|
|
Uint32 pixel = ReadPixel(_src, x,sampley);
|
|
|
|
Uint8 green = (pixel & _src->format->Gmask) >> 8;
|
|
Uint8 blue = (pixel & _src->format->Bmask) >> 0;
|
|
|
|
Uint32 pixelOffset = ReadPixel(_src, SDL_min(x+redOffset, 319), sampley) ;
|
|
Uint8 red = (pixelOffset & _src->format->Rmask) >> 16 ;
|
|
|
|
double mult;
|
|
int tmp; /* needed to avoid char overflow */
|
|
if(isscrolling && sampley > 220 && ((rand() %10) < 4))
|
|
{
|
|
mult = 0.6;
|
|
}
|
|
else
|
|
{
|
|
mult = 0.2;
|
|
}
|
|
|
|
tmp = red + fRandom() * mult * 254;
|
|
red = SDL_min(tmp, 255);
|
|
tmp = green + fRandom() * mult * 254;
|
|
green = SDL_min(tmp, 255);
|
|
tmp = blue + fRandom() * mult * 254;
|
|
blue = SDL_min(tmp, 255);
|
|
|
|
if(y % 2 == 0)
|
|
{
|
|
red = static_cast<Uint8>(red / 1.2f);
|
|
green = static_cast<Uint8>(green / 1.2f);
|
|
blue = static_cast<Uint8>(blue / 1.2f);
|
|
}
|
|
|
|
int distX = static_cast<int>((SDL_abs (160.0f -x ) / 160.0f) *16);
|
|
int distY = static_cast<int>((SDL_abs (120.0f -y ) / 120.0f)*32);
|
|
|
|
red = SDL_max(red - ( distX +distY), 0);
|
|
green = SDL_max(green - ( distX +distY), 0);
|
|
blue = SDL_max(blue - ( distX +distY), 0);
|
|
|
|
Uint32 finalPixel = ((red<<16) + (green<<8) + (blue<<0)) | (pixel &_src->format->Amask);
|
|
DrawPixel(_ret,x,y, finalPixel);
|
|
|
|
}
|
|
}
|
|
return _ret;
|
|
}
|
|
|
|
void FillRect( SDL_Surface* _surface, const int _x, const int _y, const int _w, const int _h, const int r, int g, int b )
|
|
{
|
|
SDL_Rect rect = {_x, _y, _w, _h};
|
|
Uint32 color = SDL_MapRGB(_surface->format, r, g, b);
|
|
SDL_FillRect(_surface, &rect, color);
|
|
}
|
|
|
|
void FillRect( SDL_Surface* _surface, const int r, int g, int b )
|
|
{
|
|
Uint32 color = SDL_MapRGB(_surface->format, r, g, b);
|
|
SDL_FillRect(_surface, NULL, color);
|
|
}
|
|
|
|
void FillRect( SDL_Surface* _surface, const int color )
|
|
{
|
|
SDL_FillRect(_surface, NULL, color);
|
|
}
|
|
|
|
void FillRect( SDL_Surface* _surface, const int x, const int y, const int w, const int h, int rgba )
|
|
{
|
|
SDL_Rect rect = {x, y, w, h};
|
|
SDL_FillRect(_surface, &rect, rgba);
|
|
}
|
|
|
|
void FillRect( SDL_Surface* _surface, SDL_Rect& _rect, const int r, int g, int b )
|
|
{
|
|
Uint32 color = SDL_MapRGB(_surface->format, r, g, b);
|
|
SDL_FillRect(_surface, &_rect, color);
|
|
}
|
|
|
|
void FillRect( SDL_Surface* _surface, SDL_Rect rect, int rgba )
|
|
{
|
|
SDL_FillRect(_surface, &rect, rgba);
|
|
}
|
|
|
|
void ClearSurface(SDL_Surface* surface)
|
|
{
|
|
SDL_FillRect(surface, NULL, 0x00000000);
|
|
}
|
|
|
|
void ScrollSurface( SDL_Surface* _src, int _pX, int _pY )
|
|
{
|
|
SDL_Surface* part1 = NULL;
|
|
|
|
SDL_Rect rect1;
|
|
SDL_Rect rect2;
|
|
//scrolling up;
|
|
if(_pY < 0)
|
|
{
|
|
setRect(rect2, 0, 0, _src->w, _src->h - _pY);
|
|
|
|
part1 = GetSubSurface(_src, rect2.x, rect2.y, rect2.w, rect2.h);
|
|
|
|
SDL_Rect destrect1;
|
|
|
|
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
|
|
|
|
setRect(destrect1, 0, _pY, _pX, _src->h);
|
|
|
|
SDL_BlitSurface (part1, NULL, _src, &destrect1);
|
|
}
|
|
|
|
else if(_pY > 0)
|
|
{
|
|
|
|
setRect(rect1, 0, 0, _src->w, _src->h - _pY);
|
|
|
|
part1 = GetSubSurface(_src, rect1.x, rect1.y, rect1.w, rect1.h);
|
|
|
|
SDL_Rect destrect1;
|
|
|
|
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
|
|
|
|
setRect(destrect1, _pX, _pY, _src->w, _src->h - _pY);
|
|
|
|
SDL_BlitSurface (part1, NULL, _src, &destrect1);
|
|
|
|
}
|
|
|
|
//Right
|
|
else if(_pX <= 0)
|
|
{
|
|
setRect(rect2, 0, 0, _src->w - _pX, _src->h );
|
|
|
|
part1 = GetSubSurface(_src, rect2.x, rect2.y, rect2.w, rect2.h);
|
|
|
|
SDL_Rect destrect1;
|
|
|
|
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
|
|
|
|
setRect(destrect1, _pX, 0, _src->w - _pX, _src->h);
|
|
|
|
SDL_BlitSurface (part1, NULL, _src, &destrect1);
|
|
}
|
|
|
|
else if(_pX > 0)
|
|
{
|
|
|
|
setRect(rect1, _pX, 0, _src->w - _pX, _src->h );
|
|
|
|
part1 = GetSubSurface(_src, rect1.x, rect1.y, rect1.w, rect1.h);
|
|
|
|
SDL_Rect destrect1;
|
|
|
|
SDL_SetSurfaceBlendMode(part1, SDL_BLENDMODE_NONE);
|
|
|
|
setRect(destrect1, 0, 0, _src->w - _pX, _src->h);
|
|
|
|
SDL_BlitSurface (part1, NULL, _src, &destrect1);
|
|
|
|
}
|
|
//Cleanup temp surface
|
|
if (part1)
|
|
{
|
|
SDL_FreeSurface(part1);
|
|
}
|
|
|
|
}
|