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irrlicht/source/Irrlicht/CBlit.h

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// Copyright (C) 2002-2012 Nikolaus Gebhardt / Thomas Alten
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h
#pragma once
#include "SoftwareDriver2_helper.h"
namespace irr
{
//! f18 - fixpoint 14.18 limit to 16k Textures
#define CBLIT_USE_FIXPOINT18
#if defined(CBLIT_USE_FIXPOINT18)
typedef int f18;
#define f18_one 262144
#define f18_zero 0
#define f32_to_f18(x)((f18)floorf(((x) * 262144.f) + 0.f))
#define f32_to_f32(x)(x)
#define f18_floor(x) ((x)>>18)
#define f18_round(x) ((x+131.072)>>18)
#else
typedef float f18;
#define f18_one 1.f
#define f18_zero_dot_five 0.5f
#define f18_zero 0.f
#define f32_to_f18(x)(x)
#define f32_to_f32(x)(x)
#define f18_floor(x) ((int)(x))
#define f18_round(x) ((int)(x+0.5f))
#endif
struct SBlitJob
{
AbsRectangle Dest;
AbsRectangle Source;
u32 argb;
const void* src;
void* dst;
u32 width; //draw size
u32 height;
u32 srcPixelMul; //pixel byte size
u32 dstPixelMul;
int srcPitch; //scanline byte size. allow negative for mirror
u32 dstPitch;
bool stretch;
f32 x_stretch;
f32 y_stretch;
};
// Bitfields Cohen Sutherland
enum eClipCode
{
CLIPCODE_EMPTY = 0,
CLIPCODE_BOTTOM = 1,
CLIPCODE_TOP = 2,
CLIPCODE_LEFT = 4,
CLIPCODE_RIGHT = 8
};
inline u32 GetClipCode( const AbsRectangle &r, const core::position2d<s32> &p )
{
u32 code = CLIPCODE_EMPTY;
if ( p.X < r.x0 )
code = CLIPCODE_LEFT;
else
if ( p.X > r.x1 )
code = CLIPCODE_RIGHT;
if ( p.Y < r.y0 )
code |= CLIPCODE_TOP;
else
if ( p.Y > r.y1 )
code |= CLIPCODE_BOTTOM;
return code;
}
/*
*/
inline void GetClip(AbsRectangle &clipping, video::IImage * t)
{
clipping.x0 = 0;
clipping.y0 = 0;
clipping.x1 = t->getDimension().Width - 1;
clipping.y1 = t->getDimension().Height - 1;
}
/*
return alpha in [0;256] Granularity from 32-Bit ARGB
add highbit alpha ( alpha > 127 ? + 1 )
*/
static inline u32 extractAlpha(const u32 c)
{
return ( c >> 24 ) + ( c >> 31 );
}
/*
return alpha in [0;255] Granularity and 32-Bit ARGB
add highbit alpha ( alpha > 127 ? + 1 )
*/
static inline u32 packAlpha(const u32 c)
{
return (c > 127 ? c - 1 : c) << 24;
}
/*!
Scale Color by (1/value)
value 0 - 256 ( alpha )
*/
inline u32 PixelLerp32(const u32 source, const u32 value)
{
u32 srcRB = source & 0x00FF00FF;
u32 srcXG = (source & 0xFF00FF00) >> 8;
srcRB *= value;
srcXG *= value;
srcRB >>= 8;
//srcXG >>= 8;
srcXG &= 0xFF00FF00;
srcRB &= 0x00FF00FF;
return srcRB | srcXG;
}
/*!
*/
static void executeBlit_TextureCopy_x_to_x( const SBlitJob * job )
{
if (job->stretch)
{
const f18 wscale = f32_to_f18(job->x_stretch);
const f18 hscale = f32_to_f18(job->y_stretch);
f18 src_y = f18_zero;
if (job->srcPixelMul == 4)
{
const u32 *src = (u32*)(job->src);
u32 *dst = (u32*)(job->dst);
for (u32 dy = 0; dy < job->height; ++dy, src_y += hscale)
{
src = (u32*)((u8*)(job->src) + job->srcPitch*f18_floor(src_y));
f18 src_x = f18_zero;
for (u32 dx = 0; dx < job->width; ++dx, src_x += wscale)
{
dst[dx] = src[f18_floor(src_x)];
}
dst = (u32*)((u8*)(dst)+job->dstPitch);
}
}
else if (job->srcPixelMul == 2)
{
const u16 *src = (u16*)(job->src);
u16* dst = (u16*)(job->dst);
for (u32 dy = 0; dy < job->height; ++dy, src_y += hscale)
{
src = (u16*)((u8*)(job->src) + job->srcPitch*f18_floor(src_y));
f18 src_x = f18_zero;
for (u32 dx = 0; dx < job->width; ++dx, src_x += wscale)
{
dst[dx] = src[f18_floor(src_x)];
}
dst = (u16*)((u8*)(dst)+job->dstPitch);
}
}
}
else
{
const size_t widthPitch = job->width * job->dstPixelMul;
const void *src = (void*) job->src;
void *dst = (void*) job->dst;
for ( u32 dy = 0; dy < job->height; ++dy )
{
memcpy( dst, src, widthPitch);
src = (void*) ( (u8*) (src) + job->srcPitch );
dst = (void*) ( (u8*) (dst) + job->dstPitch );
}
}
}
/*!
*/
static void executeBlit_TextureCopy_32_to_16( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u32 *src = static_cast<const u32*>(job->src);
u16 *dst = static_cast<u16*>(job->dst);
if (job->stretch)
{
const float wscale = job->x_stretch;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (u32*) ( (u8*) (job->src) + job->srcPitch*src_y );
for ( u32 dx = 0; dx < w; ++dx )
{
const u32 src_x = (u32)(dx*wscale);
//16 bit Blitter depends on pre-multiplied color
const u32 s = PixelLerp32( src[src_x] | 0xFF000000, extractAlpha( src[src_x] ) );
dst[dx] = video::A8R8G8B8toA1R5G5B5( s );
}
dst = (u16*) ( (u8*) (dst) + job->dstPitch );
}
}
else
{
for ( u32 dy = 0; dy != h; ++dy )
{
for ( u32 dx = 0; dx != w; ++dx )
{
//16 bit Blitter depends on pre-multiplied color
const u32 s = PixelLerp32( src[dx] | 0xFF000000, extractAlpha( src[dx] ) );
dst[dx] = video::A8R8G8B8toA1R5G5B5( s );
}
src = (u32*) ( (u8*) (src) + job->srcPitch );
dst = (u16*) ( (u8*) (dst) + job->dstPitch );
}
}
}
/*!
*/
static void executeBlit_TextureCopy_24_to_16( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u8 *src = static_cast<const u8*>(job->src);
u16 *dst = static_cast<u16*>(job->dst);
if (job->stretch)
{
const float wscale = job->x_stretch * 3.f;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (u8*)(job->src) + job->srcPitch*src_y;
for ( u32 dx = 0; dx < w; ++dx )
{
const u8* src_x = src+(u32)(dx*wscale);
dst[dx] = video::RGBA16(src_x[0], src_x[1], src_x[2]);
}
dst = (u16*) ( (u8*) (dst) + job->dstPitch );
}
}
else
{
for ( u32 dy = 0; dy != h; ++dy )
{
const u8* s = src;
for ( u32 dx = 0; dx != w; ++dx )
{
dst[dx] = video::RGBA16(s[0], s[1], s[2]);
s += 3;
}
src = src+job->srcPitch;
dst = (u16*) ( (u8*) (dst) + job->dstPitch );
}
}
}
/*!
*/
static void executeBlit_TextureCopy_16_to_32( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u16 *src = static_cast<const u16*>(job->src);
u32 *dst = static_cast<u32*>(job->dst);
if (job->stretch)
{
const float wscale = job->x_stretch;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (u16*) ( (u8*) (job->src) + job->srcPitch*src_y );
for ( u32 dx = 0; dx < w; ++dx )
{
const u32 src_x = (u32)(dx*wscale);
dst[dx] = video::A1R5G5B5toA8R8G8B8(src[src_x]);
}
dst = (u32*) ( (u8*) (dst) + job->dstPitch );
}
}
else
{
for ( u32 dy = 0; dy != h; ++dy )
{
for ( u32 dx = 0; dx != w; ++dx )
{
dst[dx] = video::A1R5G5B5toA8R8G8B8( src[dx] );
}
src = (u16*) ( (u8*) (src) + job->srcPitch );
dst = (u32*) ( (u8*) (dst) + job->dstPitch );
}
}
}
static void executeBlit_TextureCopy_16_to_24( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u16 *src = static_cast<const u16*>(job->src);
u8 *dst = static_cast<u8*>(job->dst);
if (job->stretch)
{
const float wscale = job->x_stretch;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (u16*) ( (u8*) (job->src) + job->srcPitch*src_y );
for ( u32 dx = 0; dx < w; ++dx )
{
const u32 src_x = (u32)(dx*wscale);
u32 color = video::A1R5G5B5toA8R8G8B8(src[src_x]);
u8 * writeTo = &dst[dx * 3];
*writeTo++ = (color >> 16)& 0xFF;
*writeTo++ = (color >> 8) & 0xFF;
*writeTo++ = color & 0xFF;
}
dst += job->dstPitch;
}
}
else
{
for ( u32 dy = 0; dy != h; ++dy )
{
for ( u32 dx = 0; dx != w; ++dx )
{
u32 color = video::A1R5G5B5toA8R8G8B8(src[dx]);
u8 * writeTo = &dst[dx * 3];
*writeTo++ = (color >> 16)& 0xFF;
*writeTo++ = (color >> 8) & 0xFF;
*writeTo++ = color & 0xFF;
}
src = (u16*) ( (u8*) (src) + job->srcPitch );
dst += job->dstPitch;
}
}
}
/*!
*/
static void executeBlit_TextureCopy_24_to_32( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u8 *src = static_cast<const u8*>(job->src);
u32 *dst = static_cast<u32*>(job->dst);
if (job->stretch)
{
const float wscale = job->x_stretch * 3.f;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (const u8*)job->src+(job->srcPitch*src_y);
for ( u32 dx = 0; dx < w; ++dx )
{
const u8* s = src+(u32)(dx*wscale);
dst[dx] = 0xFF000000 | s[0] << 16 | s[1] << 8 | s[2];
}
dst = (u32*) ( (u8*) (dst) + job->dstPitch );
}
}
else
{
for ( u32 dy = 0; dy < job->height; ++dy )
{
const u8* s = src;
for ( u32 dx = 0; dx < job->width; ++dx )
{
dst[dx] = 0xFF000000 | s[0] << 16 | s[1] << 8 | s[2];
s += 3;
}
src = src + job->srcPitch;
dst = (u32*) ( (u8*) (dst) + job->dstPitch );
}
}
}
static void executeBlit_TextureCopy_32_to_24( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u32 *src = static_cast<const u32*>(job->src);
u8 *dst = static_cast<u8*>(job->dst);
if (job->stretch)
{
const float wscale = job->x_stretch;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (u32*) ( (u8*) (job->src) + job->srcPitch*src_y);
for ( u32 dx = 0; dx < w; ++dx )
{
const u32 src_x = src[(u32)(dx*wscale)];
u8 * writeTo = &dst[dx * 3];
*writeTo++ = (src_x >> 16)& 0xFF;
*writeTo++ = (src_x >> 8) & 0xFF;
*writeTo++ = src_x & 0xFF;
}
dst += job->dstPitch;
}
}
else
{
for ( u32 dy = 0; dy != h; ++dy )
{
for ( u32 dx = 0; dx != w; ++dx )
{
u8 * writeTo = &dst[dx * 3];
*writeTo++ = (src[dx] >> 16)& 0xFF;
*writeTo++ = (src[dx] >> 8) & 0xFF;
*writeTo++ = src[dx] & 0xFF;
}
src = (u32*) ( (u8*) (src) + job->srcPitch );
dst += job->dstPitch;
}
}
}
/*!
*/
static void executeBlit_TextureBlend_16_to_16( const SBlitJob * job )
{
const f18 wscale = f32_to_f18(job->x_stretch);
const f18 hscale = f32_to_f18(job->y_stretch);
f18 src_y = f18_zero;
u16 *dst = (u16*)job->dst;
for (u32 dy = 0; dy < job->height; ++dy, src_y += hscale)
{
const u16* src = (u16*)((u8*)(job->src) + job->srcPitch*f18_floor(src_y));
f18 src_x = f18_zero;
for (u32 dx = 0; dx < job->width; ++dx, src_x += wscale)
{
dst[dx] = PixelBlend16(dst[dx], src[f18_floor(src_x)]);
}
dst = (u16*)((u8*)(dst)+job->dstPitch);
}
}
/*!
*/
static void executeBlit_TextureBlend_32_to_32( const SBlitJob * job )
{
const f18 wscale = f32_to_f18(job->x_stretch);
const f18 hscale = f32_to_f18(job->y_stretch);
f18 src_y = f18_zero;
u32 *dst = (u32*)job->dst;
for (u32 dy = 0; dy < job->height; ++dy, src_y += hscale)
{
const u32* src = (u32*)((u8*)(job->src) + job->srcPitch*f18_floor(src_y));
f18 src_x = f18_zero;
for (u32 dx = 0; dx < job->width; ++dx, src_x += wscale)
{
dst[dx] = PixelBlend32(dst[dx], src[f18_floor(src_x)]);
}
dst = (u32*)((u8*)(dst)+job->dstPitch);
}
}
/*!
*/
static void executeBlit_TextureBlendColor_16_to_16( const SBlitJob * job )
{
const u16 blend = video::A8R8G8B8toA1R5G5B5(job->argb);
const f18 wscale = f32_to_f18(job->x_stretch);
const f18 hscale = f32_to_f18(job->y_stretch);
f18 src_y = f18_zero;
u16 *dst = (u16*)job->dst;
for (u32 dy = 0; dy < job->height; ++dy, src_y += hscale)
{
const u16* src = (u16*)((u8*)(job->src) + job->srcPitch*f18_floor(src_y));
f18 src_x = f18_zero;
for (u32 dx = 0; dx < job->width; ++dx, src_x += wscale)
{
u16 c0 = src[f18_floor(src_x)];
if (0 == (c0 & 0x8000))
continue;
dst[dx] = PixelMul16_2(c0, blend);
}
dst = (u16*)((u8*)(dst)+job->dstPitch);
}
}
/*!
*/
static void executeBlit_TextureBlendColor_32_to_32( const SBlitJob * job )
{
const f18 wscale = f32_to_f18(job->x_stretch);
const f18 hscale = f32_to_f18(job->y_stretch);
u32* dst = (u32*)job->dst;
f18 src_y = f18_zero;
for (u32 dy = 0; dy < job->height; ++dy, src_y += hscale)
{
const u32* src = (u32*)((u8*)(job->src) + job->srcPitch*f18_floor(src_y));
f18 src_x = f18_zero;
for (u32 dx = 0; dx < job->width; ++dx, src_x += wscale)
{
dst[dx] = PixelBlend32(dst[dx], PixelMul32_2(src[f18_floor(src_x)], job->argb));
}
dst = (u32*)((u8*)(dst)+job->dstPitch);
}
}
/*!
*/
static void executeBlit_Color_16_to_16( const SBlitJob * job )
{
const u16 c = video::A8R8G8B8toA1R5G5B5(job->argb);
u16 *dst = (u16*) job->dst;
for ( u32 dy = 0; dy < job->height; ++dy )
{
memset16(dst, c, job->srcPitch);
dst = (u16*) ( (u8*) (dst) + job->dstPitch );
}
}
/*!
*/
static void executeBlit_Color_32_to_32( const SBlitJob * job )
{
u32 *dst = (u32*) job->dst;
for ( u32 dy = 0; dy < job->height; ++dy )
{
memset32( dst, job->argb, job->srcPitch );
dst = (u32*) ( (u8*) (dst) + job->dstPitch );
}
}
/*!
*/
static void executeBlit_ColorAlpha_16_to_16( const SBlitJob * job )
{
u16 *dst = (u16*) job->dst;
const u16 alpha = extractAlpha( job->argb ) >> 3;
if ( 0 == alpha )
return;
const u32 src = video::A8R8G8B8toA1R5G5B5( job->argb );
for ( u32 dy = 0; dy != job->height; ++dy )
{
for ( u32 dx = 0; dx != job->width; ++dx )
{
dst[dx] = PixelBlend16( dst[dx], src, alpha );
}
dst = (u16*) ( (u8*) (dst) + job->dstPitch );
}
}
/*!
*/
static void executeBlit_ColorAlpha_32_to_32( const SBlitJob * job )
{
const u32 alpha = extractAlpha( job->argb );
if (0 == alpha)
return;
u32 *dst = (u32*)job->dst;
for ( u32 dy = 0; dy < job->height; ++dy )
{
for ( u32 dx = 0; dx < job->width; ++dx )
{
dst[dx] = PixelBlend32( dst[dx], job->argb, alpha );
}
dst = (u32*) ( (u8*) (dst) + job->dstPitch );
}
}
/*!
Pixel =>
color = sourceAlpha > 0 ? source, else dest
alpha = max(destAlpha, sourceAlpha)
*/
inline u16 PixelCombine16(const u16 c2, const u16 c1)
{
if (video::getAlpha(c1) > 0)
return c1;
else
return c2;
}
/*!
Combine alpha channels (increases alpha / reduces transparency)
*/
static void executeBlit_TextureCombineColor_16_to_16( const SBlitJob * job )
{
const u32 w = job->width * 2;
const u32 h = job->height * 2;
u16* src = (u16*) job->src;
u16* dst = (u16*) job->dst;
const u16 jobColor = video::A8R8G8B8toA1R5G5B5( job->argb );
/*
Stretch not supported.
*/
for ( u32 dy = 0; dy != h; dy++ )
{
for ( u32 dx = 0; dx != w; dx++ )
{
const u16 src_x = src[dx];
const u16 dst_x = dst[dx];
dst[dx] = PixelCombine16( dst_x, PixelMul16_2( src_x, jobColor ) );
}
src = (u16*) ( (u8*) (src) + job->srcPitch );
dst = (u16*) ( (u8*) (dst) + job->dstPitch );
}
}
/*!
Combine alpha channels (increases alpha / reduces transparency)
*/
static void executeBlit_TextureCombineColor_16_to_24( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u16 *src = static_cast<const u16*>(job->src);
u8 *dst = static_cast<u8*>(job->dst);
const u16 jobColor = video::A8R8G8B8toA1R5G5B5( job->argb );
if (job->stretch)
{
const float wscale = job->x_stretch;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (u16*) ( (u8*) (job->src) + job->srcPitch*src_y );
for ( u32 dx = 0; dx < w; ++dx )
{
const u32 src_x = (u32)(dx*wscale);
u32 color = PixelMul16_2( video::A1R5G5B5toA8R8G8B8(src[src_x]), jobColor);
u8 * writeTo = &dst[dx * 3];
if ( video::getAlpha(src[src_x]) > 0 ) // only overlay if source has visible alpha (alpha == 1)
{
*writeTo++ = (color >> 16)& 0xFF;
*writeTo++ = (color >> 8) & 0xFF;
*writeTo++ = color & 0xFF;
}
}
dst += job->dstPitch;
}
}
else
{
for ( u32 dy = 0; dy != h; ++dy )
{
for ( u32 dx = 0; dx != w; ++dx )
{
u32 color = PixelMul16_2( video::A1R5G5B5toA8R8G8B8(src[dx]), jobColor);
u8 * writeTo = &dst[dx * 3];
if ( video::getAlpha(src[dx]) > 0 ) // only overlay if source has visible alpha (alpha == 1)
{
*writeTo++ = (color >> 16)& 0xFF;
*writeTo++ = (color >> 8) & 0xFF;
*writeTo++ = color & 0xFF;
}
}
src = (u16*) ( (u8*) (src) + job->srcPitch );
dst += job->dstPitch;
}
}
}
/*!
Pixel =>
color = dest * ( 1 - SourceAlpha ) + source * SourceAlpha,
alpha = destAlpha * ( 1 - SourceAlpha ) + sourceAlpha
where "1" means "full scale" (255)
*/
inline u32 PixelCombine32(const u32 c2, const u32 c1)
{
// alpha test
u32 alpha = c1 & 0xFF000000;
if (0 == alpha)
return c2;
if (0xFF000000 == alpha)
{
return c1;
}
alpha >>= 24;
// add highbit alpha, if ( alpha > 127 ) alpha += 1;
// stretches [0;255] to [0;256] to avoid division by 255. use division 256 == shr 8
alpha += (alpha >> 7);
u32 srcRB = c1 & 0x00FF00FF;
u32 srcXG = c1 & 0x0000FF00;
u32 dstRB = c2 & 0x00FF00FF;
u32 dstXG = c2 & 0x0000FF00;
u32 rb = srcRB - dstRB;
u32 xg = srcXG - dstXG;
rb *= alpha;
xg *= alpha;
rb >>= 8;
xg >>= 8;
rb += dstRB;
xg += dstXG;
rb &= 0x00FF00FF;
xg &= 0x0000FF00;
u32 sa = c1 >> 24;
u32 da = c2 >> 24;
u32 blendAlpha_fix8 = (sa * 256 + da * (256 - alpha)) >> 8;
return blendAlpha_fix8 << 24 | rb | xg;
}
/*!
Combine alpha channels (increases alpha / reduces transparency)
Destination alpha is treated as full 255
*/
static void executeBlit_TextureCombineColor_32_to_24( const SBlitJob * job )
{
const u32 w = job->width;
const u32 h = job->height;
const u32 *src = static_cast<const u32*>(job->src);
u8 *dst = static_cast<u8*>(job->dst);
if (job->stretch)
{
const float wscale = job->x_stretch;
const float hscale = job->y_stretch;
for ( u32 dy = 0; dy < h; ++dy )
{
const u32 src_y = (u32)(dy*hscale);
src = (u32*) ( (u8*) (job->src) + job->srcPitch*src_y);
for ( u32 dx = 0; dx < w; ++dx )
{
const u32 src_x = src[(u32)(dx*wscale)];
u8* writeTo = &dst[dx * 3];
const u32 dst_x = 0xFF000000 | writeTo[0] << 16 | writeTo[1] << 8 | writeTo[2];
const u32 combo = PixelCombine32( dst_x, PixelMul32_2( src_x, job->argb ) );
*writeTo++ = (combo >> 16) & 0xFF;
*writeTo++ = (combo >> 8) & 0xFF;
*writeTo++ = combo & 0xFF;
}
dst += job->dstPitch;
}
}
else
{
for ( u32 dy = 0; dy != h; ++dy )
{
for ( u32 dx = 0; dx != w; ++dx )
{
u8* writeTo = &dst[dx * 3];
const u32 dst_x = 0xFF000000 | writeTo[0] << 16 | writeTo[1] << 8 | writeTo[2];
const u32 combo = PixelCombine32( dst_x, PixelMul32_2( src[dx], job->argb ) );
*writeTo++ = (combo >> 16) & 0xFF;
*writeTo++ = (combo >> 8) & 0xFF;
*writeTo++ = combo & 0xFF;
}
src = (u32*) ( (u8*) (src) + job->srcPitch );
dst += job->dstPitch;
}
}
}
/*!
Combine alpha channels (increases alpha / reduces transparency)
*/
static void executeBlit_TextureCombineColor_32_to_32( const SBlitJob * job )
{
u32 *src = (u32*) job->src;
u32 *dst = (u32*) job->dst;
for ( u32 dy = 0; dy != job->height; ++dy )
{
for (u32 dx = 0; dx != job->width; ++dx )
{
dst[dx] = PixelCombine32( dst[dx], PixelMul32_2( src[dx], job->argb ) );
}
src = (u32*) ( (u8*) (src) + job->srcPitch );
dst = (u32*) ( (u8*) (dst) + job->dstPitch );
}
}
// Blitter Operation
enum eBlitter
{
BLITTER_INVALID = 0,
BLITTER_COLOR,
BLITTER_COLOR_ALPHA,
BLITTER_TEXTURE,
BLITTER_TEXTURE_ALPHA_BLEND,
BLITTER_TEXTURE_ALPHA_COLOR_BLEND,
BLITTER_TEXTURE_COMBINE_ALPHA,
};
typedef void (*tExecuteBlit) ( const SBlitJob * job );
/*!
*/
struct blitterTable
{
eBlitter operation;
s32 destFormat;
s32 sourceFormat;
tExecuteBlit func;
};
static const blitterTable blitTable[] =
{
{ BLITTER_TEXTURE, -2, -2, executeBlit_TextureCopy_x_to_x },
{ BLITTER_TEXTURE, video::ECF_A1R5G5B5, video::ECF_A8R8G8B8, executeBlit_TextureCopy_32_to_16 },
{ BLITTER_TEXTURE, video::ECF_A1R5G5B5, video::ECF_R8G8B8, executeBlit_TextureCopy_24_to_16 },
{ BLITTER_TEXTURE, video::ECF_A8R8G8B8, video::ECF_A1R5G5B5, executeBlit_TextureCopy_16_to_32 },
{ BLITTER_TEXTURE, video::ECF_A8R8G8B8, video::ECF_R8G8B8, executeBlit_TextureCopy_24_to_32 },
{ BLITTER_TEXTURE, video::ECF_R8G8B8, video::ECF_A1R5G5B5, executeBlit_TextureCopy_16_to_24 },
{ BLITTER_TEXTURE, video::ECF_R8G8B8, video::ECF_A8R8G8B8, executeBlit_TextureCopy_32_to_24 },
{ BLITTER_TEXTURE_ALPHA_BLEND, video::ECF_A1R5G5B5, video::ECF_A1R5G5B5, executeBlit_TextureBlend_16_to_16 },
{ BLITTER_TEXTURE_ALPHA_BLEND, video::ECF_A8R8G8B8, video::ECF_A8R8G8B8, executeBlit_TextureBlend_32_to_32 },
{ BLITTER_TEXTURE_ALPHA_COLOR_BLEND, video::ECF_A1R5G5B5, video::ECF_A1R5G5B5, executeBlit_TextureBlendColor_16_to_16 },
{ BLITTER_TEXTURE_ALPHA_COLOR_BLEND, video::ECF_A8R8G8B8, video::ECF_A8R8G8B8, executeBlit_TextureBlendColor_32_to_32 },
{ BLITTER_COLOR, video::ECF_A1R5G5B5, -1, executeBlit_Color_16_to_16 },
{ BLITTER_COLOR, video::ECF_A8R8G8B8, -1, executeBlit_Color_32_to_32 },
{ BLITTER_COLOR_ALPHA, video::ECF_A1R5G5B5, -1, executeBlit_ColorAlpha_16_to_16 },
{ BLITTER_COLOR_ALPHA, video::ECF_A8R8G8B8, -1, executeBlit_ColorAlpha_32_to_32 },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_A8R8G8B8, video::ECF_A8R8G8B8, executeBlit_TextureCombineColor_32_to_32 },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_A8R8G8B8, video::ECF_R8G8B8, executeBlit_TextureCopy_24_to_32 },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_R8G8B8, video::ECF_A8R8G8B8, executeBlit_TextureCombineColor_32_to_24 },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_R8G8B8, video::ECF_R8G8B8, executeBlit_TextureCopy_x_to_x },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_A1R5G5B5, video::ECF_R8G8B8, executeBlit_TextureCopy_24_to_16 },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_A1R5G5B5, video::ECF_A1R5G5B5, executeBlit_TextureCombineColor_16_to_16 },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_A1R5G5B5, video::ECF_R8G8B8, executeBlit_TextureCopy_24_to_16 },
{ BLITTER_TEXTURE_COMBINE_ALPHA, video::ECF_R8G8B8, video::ECF_A1R5G5B5, executeBlit_TextureCombineColor_16_to_24 },
{ BLITTER_INVALID, -1, -1, 0 }
};
static inline tExecuteBlit getBlitter2( eBlitter operation,const video::IImage * dest,const video::IImage * source )
{
video::ECOLOR_FORMAT sourceFormat = (video::ECOLOR_FORMAT) ( source ? source->getColorFormat() : -1 );
video::ECOLOR_FORMAT destFormat = (video::ECOLOR_FORMAT) ( dest ? dest->getColorFormat() : -1 );
const blitterTable * b = blitTable;
while ( b->operation != BLITTER_INVALID )
{
if ( b->operation == operation )
{
if (( b->destFormat == -1 || b->destFormat == destFormat ) &&
( b->sourceFormat == -1 || b->sourceFormat == sourceFormat ) )
return b->func;
else
if ( b->destFormat == -2 && ( sourceFormat == destFormat ) )
return b->func;
}
b += 1;
}
return 0;
}
// bounce clipping to texture
inline void setClip(AbsRectangle &out, const core::rect<s32> *clip,
const video::IImage* tex, s32 passnative, const core::dimension2d<u32>* tex_org)
{
if (0 == tex)
{
if (clip && passnative)
{
out.x0 = clip->UpperLeftCorner.X;
out.x1 = clip->LowerRightCorner.X;
out.y0 = clip->UpperLeftCorner.Y;
out.y1 = clip->LowerRightCorner.Y;
}
else
{
out.x0 = 0;
out.x1 = 0;
out.y0 = 0;
out.y1 = 0;
}
return;
}
const s32 w = tex->getDimension().Width;
const s32 h = tex->getDimension().Height;
//driver could have changed texture size.
if (clip && tex_org && ((u32)w != tex_org->Width || (u32)h != tex_org->Height))
{
out.x0 = core::s32_clamp((clip->UpperLeftCorner.X*w) / tex_org->Width, 0, w - 1);
out.x1 = core::s32_clamp((clip->LowerRightCorner.X*w) / tex_org->Width, out.x0, w);
out.y0 = core::s32_clamp((clip->UpperLeftCorner.Y*h) / tex_org->Height, 0, h - 1);
out.y1 = core::s32_clamp((clip->LowerRightCorner.Y*h) / tex_org->Height, out.y0, h);
}
else if (clip)
{
//y-1 to prevent starting on illegal memory (not ideal!).
out.x0 = core::s32_clamp(clip->UpperLeftCorner.X, 0, w - 1);
out.x1 = core::s32_clamp(clip->LowerRightCorner.X, passnative ? 0 : out.x0, w);
out.y0 = core::s32_clamp(clip->UpperLeftCorner.Y, 0, h - 1);
out.y1 = core::s32_clamp(clip->LowerRightCorner.Y, passnative ? 0 : out.y0, h);
}
else
{
out.x0 = 0;
out.y0 = 0;
out.x1 = w;
out.y1 = h;
}
}
/*!
a generic 2D Blitter
*/
static s32 Blit(eBlitter operation,
video::IImage * dest,
const core::rect<s32> *destClipping,
const core::position2d<s32> *destPos,
video::IImage * const source,
const core::rect<s32> *sourceClipping,
u32 argb)
{
tExecuteBlit blitter = getBlitter2( operation, dest, source );
if ( 0 == blitter )
{
return 0;
}
// Clipping
AbsRectangle sourceClip;
AbsRectangle destClip;
AbsRectangle v;
SBlitJob job;
setClip ( sourceClip, sourceClipping, source, 1,0 );
setClip ( destClip, destClipping, dest, 0,0 );
v.x0 = destPos ? destPos->X : 0;
v.y0 = destPos ? destPos->Y : 0;
v.x1 = v.x0 + ( sourceClip.x1 - sourceClip.x0 );
v.y1 = v.y0 + ( sourceClip.y1 - sourceClip.y0 );
if ( !intersect( job.Dest, destClip, v ) )
return 0;
job.width = job.Dest.x1 - job.Dest.x0;
job.height = job.Dest.y1 - job.Dest.y0;
job.Source.x0 = sourceClip.x0 + ( job.Dest.x0 - v.x0 );
job.Source.x1 = job.Source.x0 + job.width;
job.Source.y0 = sourceClip.y0 + ( job.Dest.y0 - v.y0 );
job.Source.y1 = job.Source.y0 + job.height;
job.argb = argb;
job.stretch = false;
job.x_stretch = 1.f;
job.y_stretch = 1.f;
if ( source )
{
job.srcPitch = source->getPitch();
job.srcPixelMul = source->getBytesPerPixel();
job.src = (void*) ( (u8*) source->getData() + ( job.Source.y0 * job.srcPitch ) + ( job.Source.x0 * job.srcPixelMul ) );
}
else
{
// use srcPitch for color operation on dest
job.srcPitch = job.width * dest->getBytesPerPixel();
}
job.dstPitch = dest->getPitch();
job.dstPixelMul = dest->getBytesPerPixel();
job.dst = (void*) ( (u8*) dest->getData() + ( job.Dest.y0 * job.dstPitch ) + ( job.Dest.x0 * job.dstPixelMul ) );
blitter( &job );
return 1;
}
}
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