mirror of
https://github.com/kevinbentley/Descent3.git
synced 2026-04-04 11:00:04 -04:00
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
#include "RendererConfig.h"
|
|
#ifdef USE_SOFTWARE_TNL
|
|
|
|
#include "3d.h"
|
|
#include "SoftwareInternal.h"
|
|
#include <string.h>
|
|
|
|
struct InstanceContext
|
|
{
|
|
matrix m_viewMatrix; // matrix
|
|
matrix m_unscaledMatrix; // unscaled matrix
|
|
vector m_viewPosition; // position
|
|
float m_modelView[4][4]; // model/view transform
|
|
};
|
|
|
|
#define MAX_INSTANCE_DEPTH 30
|
|
static InstanceContext gInstanceStack[MAX_INSTANCE_DEPTH];
|
|
static int gInstanceDepth = 0;
|
|
|
|
//instance at specified point with specified orientation
|
|
void g3_StartInstanceMatrix( vector *pos, matrix *orient )
|
|
{
|
|
ASSERT( orient != NULL );
|
|
ASSERT( gInstanceDepth < MAX_INSTANCE_DEPTH );
|
|
|
|
gInstanceStack[gInstanceDepth].m_viewMatrix = View_matrix;
|
|
gInstanceStack[gInstanceDepth].m_viewPosition = View_position;
|
|
gInstanceStack[gInstanceDepth].m_unscaledMatrix = Unscaled_matrix;
|
|
memcpy( gInstanceStack[gInstanceDepth].m_modelView, gTransformModelView, sizeof(gTransformModelView) );
|
|
++gInstanceDepth;
|
|
|
|
//step 1: subtract object position from view position
|
|
vector tempv = View_position - *pos;
|
|
|
|
//step 2: rotate view vector through object matrix
|
|
View_position = tempv * *orient;
|
|
|
|
//step 3: rotate object matrix through view_matrix (vm = ob * vm)
|
|
matrix tempm, tempm2 = ~*orient;
|
|
|
|
tempm = tempm2 * View_matrix;
|
|
View_matrix = tempm;
|
|
|
|
tempm = tempm2 * Unscaled_matrix;
|
|
Unscaled_matrix = tempm;
|
|
|
|
// transform the model/view matrix
|
|
g3_GetModelViewMatrix( &View_position, &Unscaled_matrix, (float*)gTransformModelView );
|
|
g3_UpdateFullTransform();
|
|
}
|
|
|
|
|
|
//instance at specified point with specified orientation
|
|
void g3_StartInstanceAngles(vector *pos,angvec *angles)
|
|
{
|
|
if( angles == NULL )
|
|
{
|
|
matrix ident;
|
|
vm_MakeIdentity( &ident );
|
|
g3_StartInstanceMatrix( pos, &ident );
|
|
return;
|
|
}
|
|
|
|
matrix tm;
|
|
vm_AnglesToMatrix( &tm, angles->p, angles->h, angles->b );
|
|
|
|
g3_StartInstanceMatrix( pos, &tm );
|
|
}
|
|
|
|
|
|
//pops the old context
|
|
void g3_DoneInstance()
|
|
{
|
|
--gInstanceDepth;
|
|
ASSERT( gInstanceDepth >= 0 );
|
|
|
|
View_position = gInstanceStack[gInstanceDepth].m_viewPosition;
|
|
View_matrix = gInstanceStack[gInstanceDepth].m_viewMatrix;
|
|
Unscaled_matrix = gInstanceStack[gInstanceDepth].m_unscaledMatrix;
|
|
memcpy( gTransformModelView, gInstanceStack[gInstanceDepth].m_modelView, sizeof(gTransformModelView) );
|
|
g3_UpdateFullTransform();
|
|
}
|
|
|
|
#endif
|