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raster.cpp
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/******************************************************
g-Matrix3D Neo Engine
Copyright (c)2003 Kim Seong Wan (kaswan, Â𻧱ͽÅ)
E-mail: kaswan@hitel.net
http://www.g-matrix.pe.kr
*******************************************************/
#include "stdafx.h"
#include "graphics.h"
#include "vertex.h"
#include "util.h"
#ifdef _MSC_VER
#pragma warning (disable: 4244)
#endif
#define DRAW_MODE 0
#define DEPTH_SHIFT 5 //Minimum Z value 128
int TEXWIDTH;
int TEXHEIGHT;
BYTE *pTex;
int TEXWIDTHBOUND;
int TEXHEIGHTBOUND;
struct {
int lx, rx, ty, by;
//}Bound = {100, 539, 100, 379};
}Bound = {0, 639, 0, 479};
struct {
BYTE r, g, b, a;
}color;
void PutPixel(int x, int y);
void DrawHLine(int x1, int x2, int y);
void DrawVLine(int x, int y1, int y2);
void DrawBox(int x1, int y1, int x2, int y2);
void FillBox(int x1, int y1, int x2, int y2);
void DrawLine(int x1, int y1, int x2, int y2);
void DrawTriangle(TLVertex * tri, int*);
void DrawTrianglePers(TLVertex * tri, int*);
void DrawTrianglePers16(TLVertex * tri, int*);
void DrawTriangleWire(TLVertex * tri, int*);
void SetColor(BYTE r, BYTE g, BYTE b)
{
color.r = r;
color.g = g;
color.b = b;
}
void PutPixel(int x, int y)
{
UINT offset;
WORD color565;
offset = BytesPerScanline * y + x * 2;
if ( offset > BytesPerScanline * 479 + 639 * 2 ) return;
if ( x > Bound.rx || x < Bound.lx ) return;
color565 = color.r >> 3 << 11;
color565 |= color.g >> 2 << 5;
color565 |= color.b >> 3;
*(WORD*)(pBits + offset) = color565;
}
void DrawHLine(int x1, int x2, int y)
{
UINT offset;
WORD color565;
offset = BytesPerScanline * y + x1 * 2;
for(int i = x1; i <= x2; i++)
{
color565 = color.r >> 3 << 11;
color565 |= color.g >> 2 << 5;
color565 |= color.b >> 3;
*(WORD*)(pBits + offset) = color565;
offset += 2;
}
}
void DrawVLine(int x, int y1, int y2)
{
UINT offset, offsetend;
WORD color565;
offset = BytesPerScanline * y1 + x * 2;
offsetend = BytesPerScanline * y2 + x * 2;
while(offset <= offsetend)
{
color565 = color.r >> 3 << 11;
color565 |= color.g >> 2 << 5;
color565 |= color.b >> 3;
*(WORD*)(pBits + offset) = color565;
offset += BytesPerScanline;
}
}
void DrawBox(int x1, int y1, int x2, int y2)
{
DrawVLine(x1, y1, y2);
DrawVLine(x2, y1, y2);
DrawHLine(x1, x2, y1);
DrawHLine(x1, x2, y2);
}
void FillBox(int x1, int y1, int x2, int y2)
{
UINT offset;
WORD color565;
offset = BytesPerScanline * y1 + x1 * 2;
UINT nextline = BytesPerScanline - (x2 - x1) * 2 - 2;
int i, j;
for(i = y1; i <= y2; i++)
{
for(j = x1; j <= x2; j++)
{
color565 = color.r >> 3 << 11;
color565 |= color.g >> 2 << 5;
color565 |= color.b >> 3;
*(WORD*)(pBits + offset) = color565;
offset += 2;
}
offset += nextline;
}
}
void DrawLine(int x1, int y1, int x2, int y2)
{
int y, yd;
int temp, i;
int delta_x, delta_y;
if ( (x1 == x2) && (y1 == y2) ) return;
if ( x1 > x2 )
{
temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
y1 = y2;
y2 = temp;
}
delta_x = x2 - x1;
delta_y = y2 - y1;
if ( delta_x < abs(delta_y) )
{
temp = x1;
x1 = y1;
y1 = temp;
temp = x2;
x2 = y2;
y2 = temp;
if ( x1 > x2 )
{
temp = x1;
x1 = x2;
x2 = temp;
temp = y1;
y1 = y2;
y2 = temp;
}
delta_x = x2 - x1;
delta_y = y2 - y1;
y = y1 << 16;
delta_y <<= 16;
yd = delta_y / delta_x;
for ( i = x1; i <= x2; i++ )
{
PutPixel(y>>16, i);
y += yd;
}
}
else
{
y = y1 << 16;
delta_y <<= 16;
yd = delta_y / delta_x;
for ( i = x1; i <= x2; i++ )
{
PutPixel(i, y>>16);
y += yd;
}
}
}
// rasterizer for test
void DrawScanLine(float xf1, float xf2, int y)
{
UINT offset;
int x1, x2;
int i;
x1 = ftoi(xf1);
x2 = ftoi(xf2);
if ( x1 == x2 ) return;
if (x1 < Bound.lx) x1 = Bound.lx;
if (x2 > Bound.rx) x2 = Bound.rx + 1;
offset = BytesPerScanline * y + x1 * 2;
//BYTE *pOffset = pBits + BytesPerScanline * y + x1 * 2;
WORD color565 = 0x07E0;
for(i = x1; i < x2; i++)
{
color565 = *((WORD*)(pBits + offset + 0));
if (color565 != 0)
{
*((WORD*)(pBits + offset + 0)) = 0xF800; // red
}
else
{
*((WORD*)(pBits + offset + 0)) = 0x07E0; // green
//*((WORD*)pOffset) = color565; // green
}
offset += 2;
}
}
//////////////////////////////////////
// color interpolation
// Gouraud shading
void DrawScanLine(float xf1, float xf2, int y, Vector3 &cL, Vector3 &cR)
{
struct Color3i{
int r, g, b;
};
//UINT offset;
Color3i cdi, cLLi;
int x1, x2;
x1 = ftoi(xf1);
x2 = ftoi(xf2);
if ( x1 == x2 ) return;
Vector3 cd = (cR - cL) / (x2 - x1);
cdi.r = ftoi(cd.r * 255 * 65536);
cdi.g = ftoi(cd.g * 255 * 65536);
cdi.b = ftoi(cd.b * 255 * 65536);
Vector3 cLL = cL;
if (x1 < Bound.lx)
{
cLL += cd * (Bound.lx - x1);
x1 = Bound.lx;
}
if (x2 > Bound.rx) x2 = Bound.rx + 1;
cLLi.r = ftoi(cLL.r * 255 * 65536);
cLLi.g = ftoi(cLL.g * 255 * 65536);
cLLi.b = ftoi(cLL.b * 255 * 65536);
BYTE *pOffset = pBits + BytesPerScanline * y + x1 * 2;
WORD color565;
for(int i = x1; i < x2; i++)
{
color565 = cLLi.r >> 16 >> 3 << 11;
color565 |= cLLi.g >> 16 >> 2 << 5;
color565 |= cLLi.b >> 16 >> 3;
*((WORD*)pOffset) = color565;
pOffset += 2;
cLLi.r += cdi.r;
cLLi.g += cdi.g;
cLLi.b += cdi.b;
}
}
///////////////////////////////////////////////
// linear texture mapping
void DrawScanLine(float xf1, float xf2, int y, Vector2 &tL, Vector2 &tR)
{
int x1, x2;
x1 = ftoi(xf1);
x2 = ftoi(xf2);
if ( x1 == x2 ) return;
// calculate gradient
Vector2 td = (tR - tL) / (xf2 - xf1);
// sub texel accuracy
Vector2 tLL = tL + td * (x1 - xf1);
// clipping
if (x1 < Bound.lx) // left clip
{
tLL += td * (Bound.lx - x1);
x1 = Bound.lx;
}
if (x2 > Bound.rx) x2 = Bound.rx + 1; // right clip
UINT offset = BytesPerScanline * y + x1 * 2;
WORD color565;
for(int i = x1; i < x2; i++)
{
//UINT toffset = (ftoi(tLL.v * 255 - 0.5f) << 8) * 3 + ftoi(tLL.u * 255 - 0.5f) * 3;
//UINT toffset = (ftoi(tLL.v - 0.5f) << 8) * 3 + ftoi(tLL.u - 0.5f) * 3;
UINT toffset = ( ((ftoi(tLL.v - 0.5f)&TEXHEIGHTBOUND) * TEXWIDTH) + (ftoi(tLL.u - 0.5f)&TEXWIDTHBOUND) ) * 4;
color565 = (WORD)(*(pTex + toffset + 0)) >> 3;
color565 |= (WORD)(*(pTex + toffset + 1)) >> 2 << 5;
color565 |= (WORD)(*(pTex + toffset + 2)) >> 3 << 11;
*((WORD*)(pBits + offset)) = color565;
offset += 2;
tLL += td;
}
}
// Linear texture & Gouraud shading
void DrawScanLine(float xf1, float xf2, int y, Vector3 &cL, Vector3 &cR, Vector2 &tL, Vector2 &tR)
{
struct Color3i{
int r, g, b;
} cdi, cLLi;
int x1, x2;
x1 = ftoi(xf1);
x2 = ftoi(xf2);
if ( x1 >= x2 ) return;
// color gradient
Vector3 cd = (cR - cL) / (x2 - x1);
cdi.r = ftoi(cd.r * 255 * 65536);
cdi.g = ftoi(cd.g * 255 * 65536);
cdi.b = ftoi(cd.b * 255 * 65536);
Vector3 cLL = cL;
if (x1 < Bound.lx)
{
cLL += cd * (Bound.lx - x1);
x1 = Bound.lx;
}
cLLi.r = ftoi(cLL.r * 255 * 65536);
cLLi.g = ftoi(cLL.g * 255 * 65536);
cLLi.b = ftoi(cLL.b * 255 * 65536);
// calculate gradient
Vector2 td = (tR - tL) / (xf2 - xf1);
// sub-texel accuracy
Vector2 tLL = tL + td * (x1 - xf1);
// clipping
if (x1 < Bound.lx) // left clip
{
tLL += td * (Bound.lx - x1);
x1 = Bound.lx;
}
if (x2 > Bound.rx) x2 = Bound.rx + 1; // right clip
int itLLu = ftoi(tLL.u * 65536.0f);
int itLLv = ftoi(tLL.v * 65536.0f);
int itdu = ftoi(td.u * 65536.0f);
int itdv = ftoi(td.v * 65536.0f);
int half = 32767;
UINT offset = BytesPerScanline * y + x1 * 2;
WORD color565;
for(int i = x1; i < x2; i++)
{
//UINT toffset = ((ftoi(tLL.v - 0.5f) << 8) + ftoi(tLL.u - 0.5f)) * 3;
UINT toffset = ( ((((itLLv + half)>>16)&TEXHEIGHTBOUND) * TEXWIDTH) + (((itLLu + half)>>16)&TEXWIDTHBOUND) ) * 3;
//UINT toffset = ( (((itLLv + half) >> 16) << 8 ) + ((itLLu + half) >> 16) ) * 3;
WORD tR = (WORD)(*(pTex + toffset + 2));
WORD tG = (WORD)(*(pTex + toffset + 1));
WORD tB = (WORD)(*(pTex + toffset + 0));
color565 = ((cLLi.r>>16) * tR) >> 8 >> 3 << 11;
color565 |= ((cLLi.g>>16) * tG) >> 8 >> 2 << 5;
color565 |= ((cLLi.b>>16) * tB) >> 8 >> 3;
*((WORD*)(pBits + offset)) = color565;
offset += 2;
cLLi.r += cdi.r;
cLLi.g += cdi.g;
cLLi.b += cdi.b;
//tLL += td;
itLLu += itdu;
itLLv += itdv;
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// Perspective texture & Gouraud shading with Z-buffering
void DrawScanLinePers(float xf1, float xf2, int y, Vector3 &cL, Vector3 &cR, Vector3 &tL, Vector3 &tR)
{
struct Color3i{
int r, g, b;
} cdi, cLLi;
int x1, x2;
x1 = ftoi(xf1);
x2 = ftoi(xf2);
if ( x1 >= x2 ) return;
// color gradient
Vector3 cd = (cR - cL) / (x2 - x1);
cdi.r = ftoi(cd.r * 255 * 65536);
cdi.g = ftoi(cd.g * 255 * 65536);
cdi.b = ftoi(cd.b * 255 * 65536);
Vector3 cLL = cL;
if (x1 < Bound.lx)
{
cLL += cd * (Bound.lx - x1);
x1 = Bound.lx;
}
cLLi.r = ftoi(cLL.r * 255 * 65536);
cLLi.g = ftoi(cLL.g * 255 * 65536);
cLLi.b = ftoi(cLL.b * 255 * 65536);
// calculate gradient
Vector3 td = (tR - tL) / (xf2 - xf1);
// sub-texel accuracy
Vector3 tLL = tL + td * (x1 - xf1);
// clipping
if (x1 < Bound.lx) // left clip
{
tLL += td * (Bound.lx - x1);
x1 = Bound.lx;
}
if (x2 > Bound.rx) x2 = Bound.rx + 1; // right clip
INT tu = ftoi(tLL.u * 4194304); // << 22 10.22
INT tv = ftoi(tLL.v * 4194304);
INT tq = ftoi(tLL.q * 268435456); // << 28 4.28
INT tdu = ftoi(td.u * 4194304);
INT tdv = ftoi(td.v * 4194304);
INT tdq = ftoi(td.q * 268435456);
INT half = 33554431; // << 25
UINT offset = BytesPerScanline * y + x1 * 2;
WORD color565;
for(int i = x1; i < x2; i++)
{
WORD qq = (tq >> DEPTH_SHIFT);
WORD *pDB = (WORD*)(pDepthBuffer + offset);
if (*pDB < qq)
{
//UINT toffset = ( (((itLLv + half) >> 16) * 256) + ((itLLu + half) >> 16) ) * 3;
//float w = 1 / tLL.q;
//UINT toffset = ((ftoi(tLL.v * w - 0.5f) << 8) + ftoi(tLL.u * w - 0.5f)) * 4;
//UINT toffset = ( ( ( (tv << 6) / tq ) * 256/*TEXWIDTH*/ ) + ((tu << 6) / tq) ) * 4;
INT invq; // = 0xffffffff / tq;
INT uoff; // = (tu * w) >> 28;
INT voff; // = (tv * w) >> 28;
#ifdef _MSC_VER
_asm mov ebx, tq
_asm mov edx, 1
_asm xor eax, eax
_asm idiv ebx
_asm mov invq, eax
_asm mov ebx, tu
_asm imul ebx
_asm shld edx, eax, 6
_asm mov uoff, edx
_asm mov eax, invq
_asm mov ebx, tv
_asm imul ebx
_asm shld edx, eax, 6
_asm mov voff, edx
#else
asm ("movl %0, %%ebx" : : "m" (tq));
asm ("movl $1, %edx");
asm ("xorl %eax, %eax");
asm ("idivl %ebx");
asm ("movl %%eax, %0" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tu));
asm ("imull %ebx");
asm ("shldl $6, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (uoff));
asm ("movl %0, %%eax" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tv));
asm ("imull %ebx");
asm ("shldl $6, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (voff));
#endif
//UINT uoff = (tu * w + half) >> 26;
//UINT voff = (tv * w + half) >> 26;
UINT toffset = ((voff & TEXHEIGHTBOUND) * TEXWIDTH + (uoff & TEXWIDTHBOUND)) * 4;
DWORD tcolor32 = *((DWORD*)(pTex + toffset));
WORD tB = tcolor32 & 0x000000FF;
WORD tG = (tcolor32 & 0x0000FF00) >> 8;
WORD tR = (tcolor32 & 0x00FF0000) >> 16;
//WORD tR = (WORD)(*(pTex + toffset + 2));
//WORD tG = (WORD)(*(pTex + toffset + 1));
//WORD tB = (WORD)(*(pTex + toffset + 0));
color565 = ((cLLi.r>>16) * tR) >> 8 >> 3 << 11;
color565 |= ((cLLi.g>>16) * tG) >> 8 >> 2 << 5;
color565 |= ((cLLi.b>>16) * tB) >> 8 >> 3;
*((WORD*)(pBits + offset)) = color565;
*pDB = qq;
}
offset += 2;
cLLi.r += cdi.r;
cLLi.g += cdi.g;
cLLi.b += cdi.b;
tu += tdu;
tv += tdv;
tq += tdq;
}
}
////////////////////////////////////////////////////////////////////////////
// Perspective texture 16 & Gouraud shading with Z-buffering
void DrawScanLinePers16(float xf1, float xf2, int y, Vector3 &cL, Vector3 &cR, Vector3 &tL, Vector3 &tR)
{
struct Color3i{
int r, g, b;
} cdi, cLLi;
int x1, x2;
x1 = ftoi(xf1);
x2 = ftoi(xf2);
if ( x1 >= x2 ) return;
// color gradient
Vector3 cd = (cR - cL) / (x2 - x1);
cdi.r = ftoi(cd.r * 255 * 65536);
cdi.g = ftoi(cd.g * 255 * 65536);
cdi.b = ftoi(cd.b * 255 * 65536);
Vector3 cLL = cL;
if (x1 < Bound.lx)
{
cLL += cd * (Bound.lx - x1);
x1 = Bound.lx;
}
cLLi.r = ftoi(cLL.r * 255 * 65536);
cLLi.g = ftoi(cLL.g * 255 * 65536);
cLLi.b = ftoi(cLL.b * 255 * 65536);
// calculate gradient
Vector3 td = (tR - tL) / (xf2 - xf1);
// sub-texel accuracy
Vector3 tLL = tL + td * (x1 - xf1);
// clipping
if (x1 < Bound.lx) // left clip
{
tLL += td * (Bound.lx - x1);
x1 = Bound.lx;
}
if (x2 > Bound.rx) x2 = Bound.rx + 1; // right clip
INT tu = ftoi(tLL.u * 4194304); // << 22 10.22
INT tv = ftoi(tLL.v * 4194304);
INT tq = ftoi(tLL.q * 268435456); // << 28 4.28
INT tdu = ftoi(td.u * 4194304); // << 22 10.22
INT tdv = ftoi(td.v * 4194304);
INT tdq = ftoi(td.q * 268435456);
INT half = 2097151; // << 22
INT offset = BytesPerScanline * y + x1 * 2;
WORD color565;
int i;
for(i = x1; i < (x2-16); i += 16)
{
INT invq; // = 0x100000000 / tq;
INT uoff; // = (tu * w) >> 28;
INT voff; // = (tv * w) >> 28;
#ifdef _MSC_VER
_asm mov ebx, tq
_asm mov edx, 1
_asm xor eax, eax
_asm idiv ebx
_asm mov invq, eax
_asm mov ebx, tu
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov uoff, edx
_asm mov eax, invq
_asm mov ebx, tv
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov voff, edx
#else
asm ("movl %0, %%ebx" : : "m" (tq));
asm ("movl $1, %edx");
asm ("xorl %eax, %eax");
asm ("idivl %ebx");
asm ("movl %%eax, %0" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tu));
asm ("imull %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (uoff));
asm ("movl %0, %%eax" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tv));
asm ("imull %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (voff));
#endif
INT invq1;
INT uoff1;
INT voff1;
#ifdef _MSC_VER
_asm mov ebx, tq
_asm mov eax, tdq
_asm shl eax, 4
_asm add ebx, eax
_asm mov edx, 1
_asm xor eax, eax
_asm idiv ebx
_asm mov invq1, eax
_asm mov ebx, tu
_asm mov edx, tdu
_asm shl edx, 4
_asm add ebx, edx
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov uoff1, edx
_asm mov eax, invq1
_asm mov ebx, tv
_asm mov edx, tdv
_asm shl edx, 4
_asm add ebx, edx
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov voff1, edx
#else
asm ("movl %0, %%ebx" : : "m" (tq));
asm ("movl %0, %%eax" : : "m" (tdq));
asm ("shll $4, %eax");
asm ("addl %eax, %ebx");
asm ("movl $1, %edx");
asm ("xorl %eax, %eax");
asm ("idivl %ebx");
asm ("movl %%eax, %0" : : "m" (invq1));
asm ("movl %0, %%ebx" : : "m" (tu));
asm ("movl %0, %%edx" : : "m" (tdu));
asm ("shll $4, %edx");
asm ("addl %edx, %ebx");
asm ("imull %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (uoff1));
asm ("movl %0, %%eax" : : "m" (invq1));
asm ("movl %0, %%ebx" : : "m" (tv));
asm ("movl %0, %%edx" : : "m" (tdv));
asm ("shll $4, %edx");
asm ("addl %edx, %ebx");
asm ("imull %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (voff1));
#endif
int itdu = (uoff1 - uoff) / 16;
int itdv = (voff1 - voff) / 16;
for (int j = 0; j < 16; j++)
{
WORD qq = tq >> DEPTH_SHIFT;
WORD *pDB = (WORD*)(pDepthBuffer + offset);
if (*pDB < qq)
{
UINT toffset = ( (((voff + half)>>22)&TEXHEIGHTBOUND) * TEXWIDTH + ( ((uoff + half)>>22)&TEXWIDTHBOUND) ) * 4;
DWORD tcolor32 = *((DWORD*)(pTex + toffset));
WORD tB = tcolor32 & 0x000000FF;
WORD tG = (tcolor32 & 0x0000FF00) >> 8;
WORD tR = (tcolor32 & 0x00FF0000) >> 16;
//WORD tR = (WORD)(*(pTex + toffset + 2));
//WORD tG = (WORD)(*(pTex + toffset + 1));
//WORD tB = (WORD)(*(pTex + toffset + 0));
color565 = ((cLLi.r>>16) * tR) >> 8 >> 3 << 11;
color565 |= ((cLLi.g>>16) * tG) >> 8 >> 2 << 5;
color565 |= ((cLLi.b>>16) * tB) >> 8 >> 3;
*((WORD*)(pBits + offset)) = color565;
*pDB = qq;
}
offset += 2;
cLLi.r += cdi.r;
cLLi.g += cdi.g;
cLLi.b += cdi.b;
uoff += itdu;
voff += itdv;
//tu += tdu;
//tv += tdv;
tq += tdq;
}
tu += tdu * 16;
tv += tdv * 16;
}
for (int j = i; j < x2; j++)
{
WORD qq = tq >> DEPTH_SHIFT;
WORD *pDB = (WORD*)(pDepthBuffer + offset);
if (*pDB < qq)
{
INT invq; // = 0x100000000 / tq;
INT uoff; // = (tu * w) >> 28;
INT voff; // = (tv * w) >> 28;
#ifdef _MSC_VER
_asm mov ebx, tq
_asm mov edx, 1
_asm xor eax, eax
_asm idiv ebx
_asm mov invq, eax
_asm mov ebx, tu
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov uoff, edx
_asm mov eax, invq
_asm mov ebx, tv
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov voff, edx
#else
asm ("movl %0, %%ebx" : : "m" (tq));
asm ("movl $1, %edx");
asm ("xorl %eax, %eax");
asm ("idivl %ebx");
asm ("movl %%eax, %0" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tu));
asm ("imull %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (uoff));
asm ("movl %0, %%eax" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tv));
asm ("imull %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (voff));
#endif
UINT toffset = ( (((voff + half)>>22)&TEXHEIGHTBOUND ) * TEXWIDTH + (((uoff + half)>>22)&TEXWIDTHBOUND) ) * 4;
DWORD tcolor32 = *((DWORD*)(pTex + toffset));
WORD tB = tcolor32 & 0x000000FF;
WORD tG = (tcolor32 & 0x0000FF00) >> 8;
WORD tR = (tcolor32 & 0x00FF0000) >> 16;
//WORD tR = (WORD)(*(pTex + toffset + 2));
//WORD tG = (WORD)(*(pTex + toffset + 1));
//WORD tB = (WORD)(*(pTex + toffset + 0));
color565 = ((cLLi.r>>16) * tR) >> 8 >> 3 << 11;
color565 |= ((cLLi.g>>16) * tG) >> 8 >> 2 << 5;
color565 |= ((cLLi.b>>16) * tB) >> 8 >> 3;
*((WORD*)(pBits + offset)) = color565;
*pDB = qq;
}
offset += 2;
cLLi.r += cdi.r;
cLLi.g += cdi.g;
cLLi.b += cdi.b;
tu += tdu;
tv += tdv;
tq += tdq;
}
}
////////////////////////////////////////////////////////////////////////////////
// (WireFrame) Perspective texture 16 & Gouraud shading with Z-buffering
void DrawScanLineWire(float xf1, float xf2, int y, Vector3 &cL, Vector3 &cR, Vector3 &tL, Vector3 &tR)
{
struct Color3i{
int r, g, b;
} cdi, cLLi;
int x1, x2;
x1 = ftoi(xf1);
x2 = ftoi(xf2);
if ( x1 >= x2 ) return;
// color gradient
Vector3 cd = (cR - cL) / (x2 - x1);
cdi.r = ftoi(cd.r * 255 * 65536);
cdi.g = ftoi(cd.g * 255 * 65536);
cdi.b = ftoi(cd.b * 255 * 65536);
Vector3 cLL = cL;
if (x1 < Bound.lx)
{
cLL += cd * (Bound.lx - x1);
x1 = Bound.lx;
}
cLLi.r = ftoi(cLL.r * 255 * 65536);
cLLi.g = ftoi(cLL.g * 255 * 65536);
cLLi.b = ftoi(cLL.b * 255 * 65536);
// calculate gradient
Vector3 td = (tR - tL) / (xf2 - xf1);
// sub-texel accuracy
Vector3 tLL = tL + td * (x1 - xf1);
// clipping
if (x1 < Bound.lx) // left clip
{
tLL += td * (Bound.lx - x1);
x1 = Bound.lx;
}
if (x2 > Bound.rx) x2 = Bound.rx + 1; // right clip
INT tu = ftoi(tLL.u * 4194304); // << 22 10.22
INT tv = ftoi(tLL.v * 4194304);
INT tq = ftoi(tLL.q * 268435456); // << 28 4.28
INT tdu = ftoi(td.u * 4194304); // << 22 10.22
INT tdv = ftoi(td.v * 4194304);
INT tdq = ftoi(td.q * 268435456);
INT half = 2097151; // << 22
INT offset = BytesPerScanline * y + x1 * 2;
WORD color565;
INT invq; // = 0x100000000 / tq;
INT uoff; // = (tu * w) >> 28;
INT voff; // = (tv * w) >> 28;
#ifdef _MSC_VER
_asm mov ebx, tq
_asm mov edx, 1
_asm xor eax, eax
_asm idiv ebx
_asm mov invq, eax
_asm mov ebx, tu
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov uoff, edx
_asm mov eax, invq
_asm mov ebx, tv
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov voff, edx
#else
asm ("movl %0, %%ebx" : : "m" (tq));
asm ("movl $1, %edx");
asm ("xorl %eax, %eax");
asm ("idivl %ebx");
asm ("movl %%eax, %0" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tu));
asm ("imul %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (uoff));
asm ("movl %0, %%eax" : : "m" (invq));
asm ("movl %0, %%ebx" : : "m" (tv));
asm ("imul %ebx");
asm ("shldl $28, %eax, %edx");
asm ("mov %%edx, %0" : : "m" (voff));
#endif
INT invq1;
INT uoff1;
INT voff1;
#ifdef _MSC_VER
_asm mov ebx, tq
_asm mov eax, tdq
_asm shl eax, 4
_asm add ebx, eax
_asm mov edx, 1
_asm xor eax, eax
_asm idiv ebx
_asm mov invq1, eax
_asm mov ebx, tu
_asm mov edx, tdu
_asm shl edx, 4
_asm add ebx, edx
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov uoff1, edx
_asm mov eax, invq1
_asm mov ebx, tv
_asm mov edx, tdv
_asm shl edx, 4
_asm add ebx, edx
_asm imul ebx
_asm shld edx, eax, 6 + 22
_asm mov voff1, edx
#else
asm ("movl %0, %%ebx" : : "m" (tq));
asm ("movl %0, %%eax" : : "m" (tdq));
asm ("shll $4, %eax");
asm ("addl %eax, %ebx");
asm ("movl $1, %edx");
asm ("xorl %eax, %eax");
asm ("idivl %ebx");
asm ("movl %%eax, %0" : : "m" (invq1));
asm ("movl %0, %%ebx" : : "m" (tu));
asm ("movl %0, %%edx" : : "m" (tdu));
asm ("shll $4, %edx");
asm ("addl %edx, %ebx");
asm ("imul %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (uoff1));
asm ("movl %0, %%eax" : : "m" (invq1));
asm ("movl %0, %%ebx" : : "m" (tv));
asm ("movl %0, %%edx" : : "m" (tdv));
asm ("shll $4, %edx");
asm ("addl %edx, %ebx");
asm ("imul %ebx");
asm ("shldl $28, %eax, %edx");
asm ("movl %%edx, %0" : : "m" (voff1));
#endif
int itdu = (uoff1 - uoff) / 16;
int itdv = (voff1 - voff) / 16;
if (x1 > 639) return;
WORD qq = tq >> DEPTH_SHIFT;
WORD *pDB = (WORD*)(pDepthBuffer + offset);
if (*pDB < qq)
{
UINT toffset = ( (((voff + half)>>22)&TEXHEIGHTBOUND) * TEXWIDTH + ( ((uoff + half)>>22)&TEXWIDTHBOUND) ) * 4;
DWORD tcolor32 = *((DWORD*)(pTex + toffset));
WORD tB = tcolor32 & 0x000000FF;
WORD tG = (tcolor32 & 0x0000FF00) >> 8;
WORD tR = (tcolor32 & 0x00FF0000) >> 16;
color565 = ((cLLi.r>>16) * tR) >> 8 >> 3 << 11;
color565 |= ((cLLi.g>>16) * tG) >> 8 >> 2 << 5;
color565 |= ((cLLi.b>>16) * tB) >> 8 >> 3;