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CnC_Renegade/Code/ww3d2/bwrender.cpp

242 lines
7 KiB
C++

/*
** Command & Conquer Renegade(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program 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 3 of the License, or
** (at your option) any later version.
**
** This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/***********************************************************************************************
*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
***********************************************************************************************
* *
* Project Name : ww3d2 *
* *
* $Archive:: /Commando/Code/ww3d2/bwrender.cpp $*
* *
* Original Author:: Jani Penttinen *
* *
* $Author:: Greg_h $*
* *
* $Modtime:: 4/04/01 10:14a $*
* *
* $Revision:: 2 $*
* *
*---------------------------------------------------------------------------------------------*
* Functions: *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "bwrender.h"
#include "vp.h"
#include <string.h>
BWRenderClass::Buffer::Buffer(unsigned char* buffer_, int scale_)
:
buffer(buffer_),
scale(scale_),
minv(3),
maxv(scale_-3)
{
}
BWRenderClass::Buffer::~Buffer()
{
}
void BWRenderClass::Buffer::Set_H_Line(int start_x, int end_x, int y)
{
if (y<minv || y>=maxv || end_x<minv || start_x>=maxv) return;
if (start_x<minv) start_x=minv;
if (end_x>=maxv) end_x=maxv-1;
unsigned char* ptr=buffer+scale*y+start_x;
int w=end_x-start_x;
if (w) {
::memset(ptr,0x00,w);
/* // Blurring (test)
*(ptr-1)&=0x80;
*(ptr-2)&=0xc0;
*(ptr+w)&=0x80;
*(ptr+w+1)&=0xc0;
for (int a=0;a<w;++a) {
*(ptr-scale+a)&=0xc0;
*(ptr+scale+a)&=0xc0;
}
*/
}
}
void BWRenderClass::Buffer::Fill(unsigned char c)
{
memset(buffer,c,scale*scale);
}
// ------------------------------------------------------------------------------
BWRenderClass::BWRenderClass(unsigned char* buffer, int buffer_scale)
:
pixel_buffer(buffer,buffer_scale)
{
}
BWRenderClass::~BWRenderClass()
{
}
void BWRenderClass::Fill(unsigned char c)
{
pixel_buffer.Fill(c);
}
// Sets the vertex coordinate buffer location and scales the vertex locations to the kjkj
void BWRenderClass::Set_Vertex_Locations(Vector2* vertices_,int count)
{
vertices=vertices_;
float half_scale=pixel_buffer.Scale()*0.5f;
VectorProcessorClass::MulAdd(
reinterpret_cast<float*>(vertices),
half_scale,
half_scale,
count*2);
}
// --------------------------------------------------------------------
static inline bool Cull(
const Vector2& c1,
const Vector2& c2,
const Vector2& c3)
{
float x1=c2[0]-c1[0];
float y1=c2[1]-c1[1];
float x2=c3[0]-c1[0];
float y2=c3[1]-c1[1];
float r=x1*y2-x2*y1;
if (r<0) return false;
return true;
}
void BWRenderClass::Render_Triangle_Strip(const unsigned long* indices,int index_count)
{
index_count-=2;
bool b=false;
for (int n=0;n<index_count;++n) {
b=!b;
int idx_1=indices[0];
int idx_2=indices[1];
int idx_3=indices[2];
indices++;
if (Cull(vertices[idx_1],vertices[idx_2],vertices[idx_3])==b) continue;
Vector2 corner_1(vertices[idx_1][0],vertices[idx_1][1]);
Vector2 corner_2(vertices[idx_2][0],vertices[idx_2][1]);
Vector2 corner_3(vertices[idx_3][0],vertices[idx_3][1]);
// Sort the corners on y axis
if (corner_2[1]<corner_1[1]) Swap(corner_1,corner_2);
if (corner_3[1]<corner_1[1]) Swap(corner_1,corner_3);
if (corner_3[1]<corner_2[1]) Swap(corner_2,corner_3);
Vector3i yci(WWMath::Float_To_Long(corner_1[1]),WWMath::Float_To_Long(corner_2[1]),WWMath::Float_To_Long(corner_3[1]));
Vector3 xcf(corner_1[0],corner_2[0],corner_3[0]);
Render_Preprocessed_Triangle(xcf,yci);
}
}
void BWRenderClass::Render_Triangles(const unsigned long* indices,int index_count)
{
index_count/=3;
for (int n=0;n<index_count;++n) {
int idx_1=*indices++;
int idx_2=*indices++;
int idx_3=*indices++;
if (Cull(vertices[idx_1],vertices[idx_2],vertices[idx_3])) continue;
Vector2 corner_1(vertices[idx_1][0],vertices[idx_1][1]);
Vector2 corner_2(vertices[idx_2][0],vertices[idx_2][1]);
Vector2 corner_3(vertices[idx_3][0],vertices[idx_3][1]);
// Sort the corners on y axis
if (corner_2[1]<corner_1[1]) Swap(corner_1,corner_2);
if (corner_3[1]<corner_1[1]) Swap(corner_1,corner_3);
if (corner_3[1]<corner_2[1]) Swap(corner_2,corner_3);
Vector3i yci(WWMath::Float_To_Long(corner_1[1]),WWMath::Float_To_Long(corner_2[1]),WWMath::Float_To_Long(corner_3[1]));
Vector3 xcf(corner_1[0],corner_2[0],corner_3[0]);
Render_Preprocessed_Triangle(xcf,yci);
}
}
void BWRenderClass::Render_Preprocessed_Triangle(Vector3& xcf,Vector3i& yci)
{
float x_left=xcf[0];
float x_right=x_left;
int ycnt=yci[1]-yci[0];
int y=yci[0];
if (ycnt) {
float x_step_1=(xcf[1]-xcf[0])/float(ycnt);
float x_step_2=(xcf[2]-xcf[0])/float(yci[2]-y);
if (x_step_1>x_step_2) {
float t=x_step_1;
x_step_1=x_step_2;
x_step_2=t;
}
while (ycnt>0) {
pixel_buffer.Set_H_Line(WWMath::Float_To_Long(x_left),WWMath::Float_To_Long(x_right),y);
x_left+=x_step_1;
x_right+=x_step_2;
ycnt--;
y++;
}
}
else {
if (xcf[0]<xcf[1]) {
x_left=xcf[0];
x_right=xcf[1];
}
else {
x_right=xcf[0];
x_left=xcf[1];
}
}
ycnt=yci[2]-yci[1];
y=yci[1];
if (ycnt) {
float one_per_ycnt=1.0f/float(ycnt);
float x_step_1=(xcf[2]-x_left)*one_per_ycnt;
float x_step_2=(xcf[2]-x_right)*one_per_ycnt;
while (ycnt>0) {
pixel_buffer.Set_H_Line(WWMath::Float_To_Long(x_left),WWMath::Float_To_Long(x_right),y);
x_left+=x_step_1;
x_right+=x_step_2;
ycnt--;
y++;
}
}
}