Initial import

renderer/SoftwareInstance.cpp

@@ -0,0 +1,84 @@
+#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