mirror of
https://github.com/godotengine/godot.git
synced 2024-11-27 09:16:35 +08:00
b1e8889d96
They are not particularly packaged in Linux distros so we do not facilitate unbundling via SCons. There could be done if/when there is interest. Also s/pnm/pbm/, long-lived typo :)
475 lines
14 KiB
C++
475 lines
14 KiB
C++
//============================================================================
|
|
|
|
#include "PvrTcEncoder.h"
|
|
#include "AlphaBitmap.h"
|
|
#include "PvrTcPacket.h"
|
|
#include "RgbBitmap.h"
|
|
#include "RgbaBitmap.h"
|
|
#include "MortonTable.h"
|
|
#include "BitUtility.h"
|
|
#include "Interval.h"
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
//============================================================================
|
|
|
|
using namespace Javelin;
|
|
using Data::MORTON_TABLE;
|
|
|
|
//============================================================================
|
|
|
|
static const unsigned char MODULATION_LUT[16] =
|
|
{
|
|
0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3
|
|
};
|
|
|
|
//============================================================================
|
|
|
|
inline unsigned PvrTcEncoder::GetMortonNumber(int x, int y)
|
|
{
|
|
return MORTON_TABLE[x >> 8] << 17 | MORTON_TABLE[y >> 8] << 16 | MORTON_TABLE[x & 0xFF] << 1 | MORTON_TABLE[y & 0xFF];
|
|
}
|
|
|
|
//============================================================================
|
|
|
|
void PvrTcEncoder::EncodeAlpha2Bpp(void* result, const AlphaBitmap& bitmap)
|
|
{
|
|
int size = bitmap.GetBitmapWidth();
|
|
assert(size == bitmap.GetBitmapHeight());
|
|
assert(BitUtility::IsPowerOf2(size));
|
|
|
|
// Blocks in each dimension.
|
|
int xBlocks = size/8;
|
|
int yBlocks = size/4;
|
|
|
|
const unsigned char* bitmapData = bitmap.GetRawData();
|
|
|
|
PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
|
|
for(int y = 0; y < yBlocks; ++y)
|
|
{
|
|
for(int x = 0; x < xBlocks; ++x)
|
|
{
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->usePunchthroughAlpha = 0;
|
|
packet->colorAIsOpaque = 0;
|
|
packet->colorA = 0x7ff; // White, with 0 alpha
|
|
packet->colorBIsOpaque = 1;
|
|
packet->colorB = 0x7fff; // White with full alpha
|
|
|
|
const unsigned char* blockBitmapData = &bitmapData[y*4*size + x*8];
|
|
|
|
uint32_t modulationData = 0;
|
|
for(int py = 0; py < 4; ++py)
|
|
{
|
|
const unsigned char* rowBitmapData = blockBitmapData;
|
|
for(int px = 0; px < 8; ++px)
|
|
{
|
|
unsigned char pixel = *rowBitmapData++;
|
|
modulationData = BitUtility::RotateRight(modulationData | (pixel >> 7), 1);
|
|
}
|
|
blockBitmapData += size;
|
|
}
|
|
packet->modulationData = modulationData;
|
|
}
|
|
}
|
|
}
|
|
|
|
void PvrTcEncoder::EncodeAlpha4Bpp(void* result, const AlphaBitmap& bitmap)
|
|
{
|
|
int size = bitmap.GetBitmapWidth();
|
|
assert(size == bitmap.GetBitmapHeight());
|
|
assert(BitUtility::IsPowerOf2(size));
|
|
|
|
// Blocks in each dimension.
|
|
int blocks = size/4;
|
|
|
|
const unsigned char* bitmapData = bitmap.GetRawData();
|
|
|
|
PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
|
|
for(int y = 0; y < blocks; ++y)
|
|
{
|
|
for(int x = 0; x < blocks; ++x)
|
|
{
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->usePunchthroughAlpha = 0;
|
|
packet->colorAIsOpaque = 0;
|
|
packet->colorA = 0x7ff; // White, with 0 alpha
|
|
packet->colorBIsOpaque = 1;
|
|
packet->colorB = 0x7fff; // White with full alpha
|
|
|
|
const unsigned char* blockBitmapData = &bitmapData[(y*size + x)*4];
|
|
|
|
uint32_t modulationData = 0;
|
|
for(int py = 0; py < 4; ++py)
|
|
{
|
|
const unsigned char* rowBitmapData = blockBitmapData;
|
|
for(int px = 0; px < 4; ++px)
|
|
{
|
|
unsigned char pixel = *rowBitmapData++;
|
|
modulationData = BitUtility::RotateRight(modulationData | MODULATION_LUT[pixel>>4], 2);
|
|
}
|
|
blockBitmapData += size;
|
|
}
|
|
packet->modulationData = modulationData;
|
|
}
|
|
}
|
|
}
|
|
|
|
//============================================================================
|
|
|
|
typedef Interval<ColorRgb<unsigned char> > ColorRgbBoundingBox;
|
|
|
|
static void CalculateBoundingBox(ColorRgbBoundingBox& cbb, const RgbBitmap& bitmap, int blockX, int blockY)
|
|
{
|
|
int size = bitmap.GetBitmapWidth();
|
|
const ColorRgb<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
|
|
|
|
cbb.min = data[0];
|
|
cbb.max = data[0];
|
|
cbb |= data[1];
|
|
cbb |= data[2];
|
|
cbb |= data[3];
|
|
|
|
cbb |= data[size];
|
|
cbb |= data[size+1];
|
|
cbb |= data[size+2];
|
|
cbb |= data[size+3];
|
|
|
|
cbb |= data[2*size];
|
|
cbb |= data[2*size+1];
|
|
cbb |= data[2*size+2];
|
|
cbb |= data[2*size+3];
|
|
|
|
cbb |= data[3*size];
|
|
cbb |= data[3*size+1];
|
|
cbb |= data[3*size+2];
|
|
cbb |= data[3*size+3];
|
|
}
|
|
|
|
void PvrTcEncoder::EncodeRgb4Bpp(void* result, const RgbBitmap& bitmap)
|
|
{
|
|
assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
|
|
assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
|
|
const int size = bitmap.GetBitmapWidth();
|
|
const int blocks = size / 4;
|
|
const int blockMask = blocks-1;
|
|
|
|
PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
|
|
|
|
for(int y = 0; y < blocks; ++y)
|
|
{
|
|
for(int x = 0; x < blocks; ++x)
|
|
{
|
|
ColorRgbBoundingBox cbb;
|
|
CalculateBoundingBox(cbb, bitmap, x, y);
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->usePunchthroughAlpha = 0;
|
|
packet->SetColorA(cbb.min);
|
|
packet->SetColorB(cbb.max);
|
|
}
|
|
}
|
|
|
|
for(int y = 0; y < blocks; ++y)
|
|
{
|
|
for(int x = 0; x < blocks; ++x)
|
|
{
|
|
const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
|
|
const ColorRgb<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
|
|
|
|
uint32_t modulationData = 0;
|
|
|
|
for(int py = 0; py < 4; ++py)
|
|
{
|
|
const int yOffset = (py < 2) ? -1 : 0;
|
|
const int y0 = (y + yOffset) & blockMask;
|
|
const int y1 = (y0+1) & blockMask;
|
|
|
|
for(int px = 0; px < 4; ++px)
|
|
{
|
|
const int xOffset = (px < 2) ? -1 : 0;
|
|
const int x0 = (x + xOffset) & blockMask;
|
|
const int x1 = (x0+1) & blockMask;
|
|
|
|
const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
|
|
const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
|
|
const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
|
|
const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
|
|
|
|
ColorRgb<int> ca = p0->GetColorRgbA() * (*factor)[0] +
|
|
p1->GetColorRgbA() * (*factor)[1] +
|
|
p2->GetColorRgbA() * (*factor)[2] +
|
|
p3->GetColorRgbA() * (*factor)[3];
|
|
|
|
ColorRgb<int> cb = p0->GetColorRgbB() * (*factor)[0] +
|
|
p1->GetColorRgbB() * (*factor)[1] +
|
|
p2->GetColorRgbB() * (*factor)[2] +
|
|
p3->GetColorRgbB() * (*factor)[3];
|
|
|
|
const ColorRgb<unsigned char>& pixel = data[py*size + px];
|
|
ColorRgb<int> d = cb - ca;
|
|
ColorRgb<int> p;
|
|
p.r=pixel.r*16;
|
|
p.g=pixel.g*16;
|
|
p.b=pixel.b*16;
|
|
ColorRgb<int> v = p - ca;
|
|
|
|
// PVRTC uses weightings of 0, 3/8, 5/8 and 1
|
|
// The boundaries for these are 3/16, 1/2 (=8/16), 13/16
|
|
int projection = (v % d) * 16;
|
|
int lengthSquared = d % d;
|
|
if(projection > 3*lengthSquared) modulationData++;
|
|
if(projection > 8*lengthSquared) modulationData++;
|
|
if(projection > 13*lengthSquared) modulationData++;
|
|
|
|
modulationData = BitUtility::RotateRight(modulationData, 2);
|
|
|
|
factor++;
|
|
}
|
|
}
|
|
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->modulationData = modulationData;
|
|
}
|
|
}
|
|
}
|
|
|
|
//============================================================================
|
|
|
|
static void CalculateBoundingBox(ColorRgbBoundingBox& cbb, const RgbaBitmap& bitmap, int blockX, int blockY)
|
|
{
|
|
int size = bitmap.GetBitmapWidth();
|
|
const ColorRgba<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
|
|
|
|
cbb.min = data[0];
|
|
cbb.max = data[0];
|
|
|
|
cbb |= data[1];
|
|
cbb |= data[2];
|
|
cbb |= data[3];
|
|
|
|
cbb |= data[size];
|
|
cbb |= data[size+1];
|
|
cbb |= data[size+2];
|
|
cbb |= data[size+3];
|
|
|
|
cbb |= data[2*size];
|
|
cbb |= data[2*size+1];
|
|
cbb |= data[2*size+2];
|
|
cbb |= data[2*size+3];
|
|
|
|
cbb |= data[3*size];
|
|
cbb |= data[3*size+1];
|
|
cbb |= data[3*size+2];
|
|
cbb |= data[3*size+3];
|
|
}
|
|
|
|
void PvrTcEncoder::EncodeRgb4Bpp(void* result, const RgbaBitmap& bitmap)
|
|
{
|
|
assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
|
|
assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
|
|
const int size = bitmap.GetBitmapWidth();
|
|
const int blocks = size / 4;
|
|
const int blockMask = blocks-1;
|
|
|
|
PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
|
|
|
|
for(int y = 0; y < blocks; ++y)
|
|
{
|
|
for(int x = 0; x < blocks; ++x)
|
|
{
|
|
ColorRgbBoundingBox cbb;
|
|
CalculateBoundingBox(cbb, bitmap, x, y);
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->usePunchthroughAlpha = 0;
|
|
packet->SetColorA(cbb.min);
|
|
packet->SetColorB(cbb.max);
|
|
}
|
|
}
|
|
|
|
for(int y = 0; y < blocks; ++y)
|
|
{
|
|
for(int x = 0; x < blocks; ++x)
|
|
{
|
|
const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
|
|
const ColorRgba<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
|
|
|
|
uint32_t modulationData = 0;
|
|
|
|
for(int py = 0; py < 4; ++py)
|
|
{
|
|
const int yOffset = (py < 2) ? -1 : 0;
|
|
const int y0 = (y + yOffset) & blockMask;
|
|
const int y1 = (y0+1) & blockMask;
|
|
|
|
for(int px = 0; px < 4; ++px)
|
|
{
|
|
const int xOffset = (px < 2) ? -1 : 0;
|
|
const int x0 = (x + xOffset) & blockMask;
|
|
const int x1 = (x0+1) & blockMask;
|
|
|
|
const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
|
|
const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
|
|
const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
|
|
const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
|
|
|
|
ColorRgb<int> ca = p0->GetColorRgbA() * (*factor)[0] +
|
|
p1->GetColorRgbA() * (*factor)[1] +
|
|
p2->GetColorRgbA() * (*factor)[2] +
|
|
p3->GetColorRgbA() * (*factor)[3];
|
|
|
|
ColorRgb<int> cb = p0->GetColorRgbB() * (*factor)[0] +
|
|
p1->GetColorRgbB() * (*factor)[1] +
|
|
p2->GetColorRgbB() * (*factor)[2] +
|
|
p3->GetColorRgbB() * (*factor)[3];
|
|
|
|
const ColorRgb<unsigned char>& pixel = data[py*size + px];
|
|
ColorRgb<int> d = cb - ca;
|
|
ColorRgb<int> p;
|
|
p.r=pixel.r*16;
|
|
p.g=pixel.g*16;
|
|
p.b=pixel.b*16;
|
|
ColorRgb<int> v = p - ca;
|
|
|
|
// PVRTC uses weightings of 0, 3/8, 5/8 and 1
|
|
// The boundaries for these are 3/16, 1/2 (=8/16), 13/16
|
|
int projection = (v % d) * 16;
|
|
int lengthSquared = d % d;
|
|
if(projection > 3*lengthSquared) modulationData++;
|
|
if(projection > 8*lengthSquared) modulationData++;
|
|
if(projection > 13*lengthSquared) modulationData++;
|
|
|
|
modulationData = BitUtility::RotateRight(modulationData, 2);
|
|
|
|
factor++;
|
|
}
|
|
}
|
|
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->modulationData = modulationData;
|
|
}
|
|
}
|
|
}
|
|
|
|
//============================================================================
|
|
|
|
typedef Interval<ColorRgba<unsigned char> > ColorRgbaBoundingBox;
|
|
|
|
static void CalculateBoundingBox(ColorRgbaBoundingBox& cbb, const RgbaBitmap& bitmap, int blockX, int blockY)
|
|
{
|
|
int size = bitmap.GetBitmapWidth();
|
|
const ColorRgba<unsigned char>* data = bitmap.GetData() + blockY * 4 * size + blockX * 4;
|
|
|
|
cbb.min = data[0];
|
|
cbb.max = data[0];
|
|
|
|
cbb |= data[1];
|
|
cbb |= data[2];
|
|
cbb |= data[3];
|
|
|
|
cbb |= data[size];
|
|
cbb |= data[size+1];
|
|
cbb |= data[size+2];
|
|
cbb |= data[size+3];
|
|
|
|
cbb |= data[2*size];
|
|
cbb |= data[2*size+1];
|
|
cbb |= data[2*size+2];
|
|
cbb |= data[2*size+3];
|
|
|
|
cbb |= data[3*size];
|
|
cbb |= data[3*size+1];
|
|
cbb |= data[3*size+2];
|
|
cbb |= data[3*size+3];
|
|
}
|
|
|
|
void PvrTcEncoder::EncodeRgba4Bpp(void* result, const RgbaBitmap& bitmap)
|
|
{
|
|
assert(bitmap.GetBitmapWidth() == bitmap.GetBitmapHeight());
|
|
assert(BitUtility::IsPowerOf2(bitmap.GetBitmapWidth()));
|
|
const int size = bitmap.GetBitmapWidth();
|
|
const int blocks = size / 4;
|
|
const int blockMask = blocks-1;
|
|
|
|
PvrTcPacket* packets = static_cast<PvrTcPacket*>(result);
|
|
|
|
for(int y = 0; y < blocks; ++y)
|
|
{
|
|
for(int x = 0; x < blocks; ++x)
|
|
{
|
|
ColorRgbaBoundingBox cbb;
|
|
CalculateBoundingBox(cbb, bitmap, x, y);
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->usePunchthroughAlpha = 0;
|
|
packet->SetColorA(cbb.min);
|
|
packet->SetColorB(cbb.max);
|
|
}
|
|
}
|
|
|
|
for(int y = 0; y < blocks; ++y)
|
|
{
|
|
for(int x = 0; x < blocks; ++x)
|
|
{
|
|
const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
|
|
const ColorRgba<unsigned char>* data = bitmap.GetData() + y * 4 * size + x * 4;
|
|
|
|
uint32_t modulationData = 0;
|
|
|
|
for(int py = 0; py < 4; ++py)
|
|
{
|
|
const int yOffset = (py < 2) ? -1 : 0;
|
|
const int y0 = (y + yOffset) & blockMask;
|
|
const int y1 = (y0+1) & blockMask;
|
|
|
|
for(int px = 0; px < 4; ++px)
|
|
{
|
|
const int xOffset = (px < 2) ? -1 : 0;
|
|
const int x0 = (x + xOffset) & blockMask;
|
|
const int x1 = (x0+1) & blockMask;
|
|
|
|
const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
|
|
const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
|
|
const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
|
|
const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
|
|
|
|
ColorRgba<int> ca = p0->GetColorRgbaA() * (*factor)[0] +
|
|
p1->GetColorRgbaA() * (*factor)[1] +
|
|
p2->GetColorRgbaA() * (*factor)[2] +
|
|
p3->GetColorRgbaA() * (*factor)[3];
|
|
|
|
ColorRgba<int> cb = p0->GetColorRgbaB() * (*factor)[0] +
|
|
p1->GetColorRgbaB() * (*factor)[1] +
|
|
p2->GetColorRgbaB() * (*factor)[2] +
|
|
p3->GetColorRgbaB() * (*factor)[3];
|
|
|
|
const ColorRgba<unsigned char>& pixel = data[py*size + px];
|
|
ColorRgba<int> d = cb - ca;
|
|
ColorRgba<int> p;
|
|
p.r=pixel.r*16;
|
|
p.g=pixel.g*16;
|
|
p.b=pixel.b*16;
|
|
p.a=pixel.a*16;
|
|
ColorRgba<int> v = p - ca;
|
|
|
|
// PVRTC uses weightings of 0, 3/8, 5/8 and 1
|
|
// The boundaries for these are 3/16, 1/2 (=8/16), 13/16
|
|
int projection = (v % d) * 16;
|
|
int lengthSquared = d % d;
|
|
if(projection > 3*lengthSquared) modulationData++;
|
|
if(projection > 8*lengthSquared) modulationData++;
|
|
if(projection > 13*lengthSquared) modulationData++;
|
|
|
|
modulationData = BitUtility::RotateRight(modulationData, 2);
|
|
|
|
factor++;
|
|
}
|
|
}
|
|
|
|
PvrTcPacket* packet = packets + GetMortonNumber(x, y);
|
|
packet->modulationData = modulationData;
|
|
}
|
|
}
|
|
}
|
|
|
|
//============================================================================
|