software rasterizer stub complete with terrible flat shaded tri renderer
This commit is contained in:
zeromus
parent
3d78ca9c1c
commit
257a138d82
|
|
@ -0,0 +1,299 @@
|
|||
/* Copyright (C) 2006 yopyop
|
||||
yopyop156@ifrance.com
|
||||
yopyop156.ifrance.com
|
||||
|
||||
Copyright 2009 DeSmuME team
|
||||
|
||||
This file is part of DeSmuME
|
||||
|
||||
DeSmuME is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
DeSmuME is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with DeSmuME; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
#include "Rasterize.h"
|
||||
#include "common.h"
|
||||
#include "render3D.h"
|
||||
#include "gfx3d.h"
|
||||
#include <algorithm>
|
||||
|
||||
using std::min;
|
||||
using std::max;
|
||||
|
||||
template<typename T> T min(T a, T b, T c) { return min(min(a,b),c); }
|
||||
template<typename T> T max(T a, T b, T c) { return max(max(a,b),c); }
|
||||
|
||||
|
||||
static u16 screen[256*192];
|
||||
|
||||
void set_pixel(int x, int y, u16 color)
|
||||
{
|
||||
if(x<0 || y<0 || x>=256 || y>=192) return;
|
||||
screen[y*256+x] = color | 0x8000;
|
||||
}
|
||||
|
||||
void hline(int x, int y, int xe, u16 color)
|
||||
{
|
||||
for(int i=x;i<=xe;i++)
|
||||
set_pixel(x,y,color);
|
||||
}
|
||||
|
||||
//http://www.devmaster.net/forums/showthread.php?t=1884
|
||||
|
||||
int iround(float f) {
|
||||
return (int)f; //lol
|
||||
}
|
||||
|
||||
void triangle_from_devmaster(int x1, int y1, int x2, int y2, int x3, int y3, u16 color)
|
||||
{
|
||||
int desty = 0;
|
||||
struct Vertex {
|
||||
int x,y;
|
||||
} v1, v2, v3;
|
||||
v1.x = x1;
|
||||
v1.y = y1;
|
||||
v2.x = x2;
|
||||
v2.y = y2;
|
||||
v3.x = x3;
|
||||
v3.y = y3;
|
||||
|
||||
// 28.4 fixed-point coordinates
|
||||
const int Y1 = iround(16.0f * v1.y);
|
||||
const int Y2 = iround(16.0f * v2.y);
|
||||
const int Y3 = iround(16.0f * v3.y);
|
||||
|
||||
const int X1 = iround(16.0f * v1.x);
|
||||
const int X2 = iround(16.0f * v2.x);
|
||||
const int X3 = iround(16.0f * v3.x);
|
||||
|
||||
// Deltas
|
||||
const int DX12 = X1 - X2;
|
||||
const int DX23 = X2 - X3;
|
||||
const int DX31 = X3 - X1;
|
||||
|
||||
const int DY12 = Y1 - Y2;
|
||||
const int DY23 = Y2 - Y3;
|
||||
const int DY31 = Y3 - Y1;
|
||||
|
||||
// Fixed-point deltas
|
||||
const int FDX12 = DX12 << 4;
|
||||
const int FDX23 = DX23 << 4;
|
||||
const int FDX31 = DX31 << 4;
|
||||
|
||||
const int FDY12 = DY12 << 4;
|
||||
const int FDY23 = DY23 << 4;
|
||||
const int FDY31 = DY31 << 4;
|
||||
|
||||
// Bounding rectangle
|
||||
int minx = (min(X1, X2, X3) + 0xF) >> 4;
|
||||
int maxx = (max(X1, X2, X3) + 0xF) >> 4;
|
||||
int miny = (min(Y1, Y2, Y3) + 0xF) >> 4;
|
||||
int maxy = (max(Y1, Y2, Y3) + 0xF) >> 4;
|
||||
|
||||
// Block size, standard 8x8 (must be power of two)
|
||||
const int q = 8;
|
||||
|
||||
// Start in corner of 8x8 block
|
||||
minx &= ~(q - 1);
|
||||
miny &= ~(q - 1);
|
||||
|
||||
//(char*&)colorBuffer += miny * stride;
|
||||
desty = miny;
|
||||
|
||||
// Half-edge constants
|
||||
int C1 = DY12 * X1 - DX12 * Y1;
|
||||
int C2 = DY23 * X2 - DX23 * Y2;
|
||||
int C3 = DY31 * X3 - DX31 * Y3;
|
||||
|
||||
// Correct for fill convention
|
||||
if(DY12 < 0 || (DY12 == 0 && DX12 > 0)) C1++;
|
||||
if(DY23 < 0 || (DY23 == 0 && DX23 > 0)) C2++;
|
||||
if(DY31 < 0 || (DY31 == 0 && DX31 > 0)) C3++;
|
||||
|
||||
// Loop through blocks
|
||||
for(int y = miny; y < maxy; y += q)
|
||||
{
|
||||
for(int x = minx; x < maxx; x += q)
|
||||
{
|
||||
// Corners of block
|
||||
int x0 = x << 4;
|
||||
int x1 = (x + q - 1) << 4;
|
||||
int y0 = y << 4;
|
||||
int y1 = (y + q - 1) << 4;
|
||||
|
||||
// Evaluate half-space functions
|
||||
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
|
||||
bool a10 = C1 + DX12 * y0 - DY12 * x1 > 0;
|
||||
bool a01 = C1 + DX12 * y1 - DY12 * x0 > 0;
|
||||
bool a11 = C1 + DX12 * y1 - DY12 * x1 > 0;
|
||||
int a = (a00 << 0) | (a10 << 1) | (a01 << 2) | (a11 << 3);
|
||||
|
||||
bool b00 = C2 + DX23 * y0 - DY23 * x0 > 0;
|
||||
bool b10 = C2 + DX23 * y0 - DY23 * x1 > 0;
|
||||
bool b01 = C2 + DX23 * y1 - DY23 * x0 > 0;
|
||||
bool b11 = C2 + DX23 * y1 - DY23 * x1 > 0;
|
||||
int b = (b00 << 0) | (b10 << 1) | (b01 << 2) | (b11 << 3);
|
||||
|
||||
bool c00 = C3 + DX31 * y0 - DY31 * x0 > 0;
|
||||
bool c10 = C3 + DX31 * y0 - DY31 * x1 > 0;
|
||||
bool c01 = C3 + DX31 * y1 - DY31 * x0 > 0;
|
||||
bool c11 = C3 + DX31 * y1 - DY31 * x1 > 0;
|
||||
int c = (c00 << 0) | (c10 << 1) | (c01 << 2) | (c11 << 3);
|
||||
|
||||
// Skip block when outside an edge
|
||||
if(a == 0x0 || b == 0x0 || c == 0x0) continue;
|
||||
|
||||
//unsigned int *buffer = colorBuffer;
|
||||
int _desty = desty;
|
||||
|
||||
// Accept whole block when totally covered
|
||||
if(a == 0xF && b == 0xF && c == 0xF)
|
||||
{
|
||||
for(int iy = 0; iy < q; iy++)
|
||||
{
|
||||
for(int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
//buffer[ix] = 0x00007F00;<< // Green
|
||||
set_pixel(ix,_desty,color);
|
||||
}
|
||||
|
||||
//(char*&)buffer += stride;
|
||||
_desty++;
|
||||
|
||||
}
|
||||
}
|
||||
else // Partially covered block
|
||||
{
|
||||
int CY1 = C1 + DX12 * y0 - DY12 * x0;
|
||||
int CY2 = C2 + DX23 * y0 - DY23 * x0;
|
||||
int CY3 = C3 + DX31 * y0 - DY31 * x0;
|
||||
|
||||
for(int iy = y; iy < y + q; iy++)
|
||||
{
|
||||
int CX1 = CY1;
|
||||
int CX2 = CY2;
|
||||
int CX3 = CY3;
|
||||
|
||||
for(int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
if(CX1 > 0 && CX2 > 0 && CX3 > 0)
|
||||
{
|
||||
//buffer[ix] = 0x0000007F;<< // Blue
|
||||
set_pixel(ix,_desty,color);
|
||||
}
|
||||
|
||||
CX1 -= FDY12;
|
||||
CX2 -= FDY23;
|
||||
CX3 -= FDY31;
|
||||
}
|
||||
|
||||
CY1 += FDX12;
|
||||
CY2 += FDX23;
|
||||
CY3 += FDX31;
|
||||
|
||||
//(char*&)buffer += stride;
|
||||
_desty ++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
//(char*&)colorBuffer += q * stride;
|
||||
desty += q;
|
||||
}
|
||||
}
|
||||
|
||||
static char Init(void)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void Reset() {}
|
||||
|
||||
static void Close() {}
|
||||
|
||||
static void VramReconfigureSignal() {}
|
||||
|
||||
static void GetLine(int line, u16* dst, u8* dstAlpha)
|
||||
{
|
||||
memcpy(dst,screen+(191-line)*256,512);
|
||||
memset(dstAlpha,16,256);
|
||||
}
|
||||
|
||||
static void GetLineCaptured(int line, u16* dst) {}
|
||||
|
||||
static void Render()
|
||||
{
|
||||
//transform verts and polys
|
||||
//which order?
|
||||
//A. clip
|
||||
//B. backface cull
|
||||
//C. transforms
|
||||
|
||||
memset(screen,0,256*192*2);
|
||||
|
||||
for(int i=0;i<gfx3d.vertlist->count;i++)
|
||||
{
|
||||
VERT &vert = gfx3d.vertlist->list[i];
|
||||
|
||||
//perspective division
|
||||
vert.coord[0] = (vert.coord[0] + vert.coord[3]) / 2 / vert.coord[3];
|
||||
vert.coord[1] = (vert.coord[1] + vert.coord[3]) / 2 / vert.coord[3];
|
||||
vert.coord[2] = (vert.coord[2] + vert.coord[3]) / 2 / vert.coord[3];
|
||||
vert.coord[3] = 1;
|
||||
|
||||
//transform to viewport. this is badly broken
|
||||
vert.coord[0] = (vert.coord[0])*128;
|
||||
vert.coord[1] = (vert.coord[1])*96;
|
||||
|
||||
int zzz=9;
|
||||
}
|
||||
|
||||
|
||||
|
||||
//iterate over gfx3d.polylist and gfx3d.vertlist
|
||||
for(int i=0;i<gfx3d.polylist->count;i++) {
|
||||
POLY *poly = &gfx3d.polylist->list[gfx3d.indexlist[i]];
|
||||
int type = poly->type;
|
||||
|
||||
|
||||
if(type == 3) {
|
||||
VERT* vert[3] = {
|
||||
&gfx3d.vertlist->list[poly->vertIndexes[0]],
|
||||
&gfx3d.vertlist->list[poly->vertIndexes[1]],
|
||||
&gfx3d.vertlist->list[poly->vertIndexes[2]],
|
||||
};
|
||||
u16 color = vert[0]->color[0] | (vert[0]->color[1]<<5) | (vert[0]->color[2]<<10);
|
||||
|
||||
|
||||
triangle_from_devmaster(
|
||||
vert[0]->coord[0],vert[0]->coord[1],
|
||||
vert[1]->coord[0],vert[1]->coord[1],
|
||||
vert[2]->coord[0],vert[2]->coord[1],
|
||||
color);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
GPU3DInterface gpu3DRasterize = {
|
||||
"SoftRasterizer",
|
||||
Init,
|
||||
Reset,
|
||||
Close,
|
||||
Render,
|
||||
VramReconfigureSignal,
|
||||
GetLine,
|
||||
GetLineCaptured
|
||||
};
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
/* Copyright (C) 2006 yopyop
|
||||
yopyop156@ifrance.com
|
||||
yopyop156.ifrance.com
|
||||
|
||||
Copyright 2009 DeSmuME team
|
||||
|
||||
This file is part of DeSmuME
|
||||
|
||||
DeSmuME is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
DeSmuME is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with DeSmuME; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
#ifndef _RASTERIZE_H_
|
||||
#define _RASTERIZE_H_
|
||||
|
||||
#include "render3D.h"
|
||||
|
||||
extern GPU3DInterface gpu3DRasterize;
|
||||
|
||||
#endif
|
||||
|
|
@ -1,7 +1,7 @@
|
|||
<?xml version="1.0" encoding="shift_jis"?>
|
||||
<VisualStudioProject
|
||||
ProjectType="Visual C++"
|
||||
Version="8,00"
|
||||
Version="8.00"
|
||||
Name="DeSmuME_VS2005"
|
||||
ProjectGUID="{9F5F72A1-D3A5-4918-B460-E076B16D10A9}"
|
||||
RootNamespace="DeSmuME"
|
||||
|
|
@ -1056,6 +1056,14 @@
|
|||
RelativePath="..\OGLRender.h"
|
||||
>
|
||||
</File>
|
||||
<File
|
||||
RelativePath="..\rasterize.cpp"
|
||||
>
|
||||
</File>
|
||||
<File
|
||||
RelativePath="..\rasterize.h"
|
||||
>
|
||||
</File>
|
||||
<File
|
||||
RelativePath="..\readwrite.cpp"
|
||||
>
|
||||
|
|
|
|||
|
|
@ -58,6 +58,7 @@
|
|||
#include "FirmConfig.h"
|
||||
#include "AboutBox.h"
|
||||
#include "OGLRender.h"
|
||||
#include "rasterize.h"
|
||||
#include "../gfx3d.h"
|
||||
#include "../render3D.h"
|
||||
#include "../gdbstub.h"
|
||||
|
|
@ -185,6 +186,7 @@ NULL
|
|||
GPU3DInterface *core3DList[] = {
|
||||
&gpu3DNull,
|
||||
&gpu3Dgl,
|
||||
&gpu3DRasterize,
|
||||
NULL
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue