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quadtree.cpp
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#include "textures.h"
#include "course.h"
#include "ogl.h"
#include "course_render.h"
#include "env.h"
#include "quadtree.h"
#define TERRAIN_ERROR_SCALE 0.1
#define VERTEX_FORCE_THRESHOLD 100
#define ERROR_MAGNIFICATION_THRESHOLD 20
#define ERROR_MAGNIFICATION_AMOUNT 3
#define ENV_MAP_ALPHA 50
#define colorval(j,ch) \
VNCArray[j*STRIDE_GL_ARRAY+STRIDE_GL_ARRAY-4+(ch)]
typedef void (*make_tri_func_t)(int a, int b, int c, int terrain);
#define setalphaval(i) colorval(VertexIndices[i], 3) = \
( terrain <= VertexTerrains[i] ) ? 255 : 0
#define update_min_max( idx ) \
if ( idx > VertexArrayMaxIdx ) { \
VertexArrayMaxIdx = idx; \
} \
if ( idx < VertexArrayMinIdx ) { \
VertexArrayMinIdx = idx; \
}
#define make_tri_list(tri_func) \
if ((EnabledFlags & 1) == 0 ) { \
tri_func(0, 2, 8, terrain); \
} else { \
if (flags & 8) tri_func(0, 1, 8, terrain); \
if (flags & 1) tri_func(0, 2, 1, terrain); \
} \
if ((EnabledFlags & 2) == 0 ) { \
tri_func(0, 4, 2, terrain); \
} else { \
if (flags & 1) tri_func(0, 3, 2, terrain); \
if (flags & 2) tri_func(0, 4, 3, terrain); \
} \
if ((EnabledFlags & 4) == 0 ) { \
tri_func(0, 6, 4, terrain); \
} else { \
if (flags & 2) tri_func(0, 5, 4, terrain); \
if (flags & 4) tri_func(0, 6, 5, terrain); \
} \
if ((EnabledFlags & 8) == 0 ) { \
tri_func(0, 8, 6, terrain); \
} else { \
if (flags & 4) tri_func(0, 7, 6, terrain); \
if (flags & 8) tri_func(0, 8, 7, terrain); \
}
GLuint quadsquare::TexId[MAX_TERR_TYPES];
GLuint quadsquare::EnvmapTexId;
GLushort *quadsquare::VertexArrayIndices = (GLushort*) NULL;
GLuint quadsquare::VertexArrayCounter;
GLuint quadsquare::VertexArrayMinIdx;
GLuint quadsquare::VertexArrayMaxIdx;
quadsquare::quadsquare (quadcornerdata* pcd) {
pcd->Square = this;
Static = false;
int i;
for (i = 0; i < 4; i++) {
Child[i] = (quadsquare*) NULL;
}
EnabledFlags = 0;
for (i = 0; i < 2; i++) SubEnabledCount[i] = 0;
Vertex[0].Y = 0.25 * (pcd->Verts[0].Y
+ pcd->Verts[1].Y + pcd->Verts[2].Y + pcd->Verts[3].Y);
Vertex[1].Y = 0.5 * (pcd->Verts[3].Y + pcd->Verts[0].Y);
Vertex[2].Y = 0.5 * (pcd->Verts[0].Y + pcd->Verts[1].Y);
Vertex[3].Y = 0.5 * (pcd->Verts[1].Y + pcd->Verts[2].Y);
Vertex[4].Y = 0.5 * (pcd->Verts[2].Y + pcd->Verts[3].Y);
for (i = 0; i < 2; i++) Error[i] = 0;
for (i = 0; i < 4; i++) {
Error[i+2] = fabs((Vertex[0].Y + pcd->Verts[i].Y)
- (Vertex[i+1].Y + Vertex[((i+1)&3) + 1].Y)) * 0.25;
}
MinY = MaxY = pcd->Verts[0].Y;
for (i = 1; i < 4; i++) {
float y = pcd->Verts[i].Y;
if (y < MinY) MinY = y;
if (y > MaxY) MaxY = y;
}
if (pcd->Parent == NULL ) {
TTerrType *TerrList = Course.TerrList;
for (i=0; i<Course.numTerr; i++) {
TexId[i] = TerrList[i].texid;
if (TexId[i] < 0) TexId[i] = 0;
}
EnvmapTexId = Tex.TexID (ENV_MAP);
}
}
quadsquare::~quadsquare(){
int i;
for (i = 0; i < 4; i++) {
if (Child[i]) delete Child[i];
Child[i] = (quadsquare*) NULL;
}
}
void quadsquare::SetStatic (const quadcornerdata &cd)
{
if (Static == false) {
Static = true;
if (cd.Parent && cd.Parent->Square) {
cd.Parent->Square->SetStatic(*cd.Parent);
}
}
}
int quadsquare::CountNodes()
{
int count = 1;
for (int i = 0; i < 4; i++) {
if (Child[i]) count += Child[i]->CountNodes();
}
return count;
}
float quadsquare::GetHeight(const quadcornerdata &cd, float x, float z) {
int half = 1 << cd.Level;
float lx = (x - cd.xorg) / float(half);
float lz = (z - cd.zorg) / float(half);
int ix = (int) floor(lx);
int iz = (int) floor(lz);
if (ix < 0) ix = 0;
if (ix > 1) ix = 1;
if (iz < 0) iz = 0;
if (iz > 1) iz = 1;
int index = (ix ^ (iz ^ 1)) + (iz << 1);
if (Child[index] && Child[index]->Static) {
quadcornerdata q;
SetupCornerData(&q, cd, index);
return Child[index]->GetHeight(q, x, z);
}
lx -= ix;
if (lx < 0) lx = 0;
if (lx > 1) lx = 1;
lz -= iz;
if (lx < 0) lz = 0;
if (lz > 1) lz = 1;
float s00, s01, s10, s11;
switch (index) {
default:
case 0:
s00 = Vertex[2].Y;
s01 = cd.Verts[0].Y;
s10 = Vertex[0].Y;
s11 = Vertex[1].Y;
break;
case 1:
s00 = cd.Verts[1].Y;
s01 = Vertex[2].Y;
s10 = Vertex[3].Y;
s11 = Vertex[0].Y;
break;
case 2:
s00 = Vertex[3].Y;
s01 = Vertex[0].Y;
s10 = cd.Verts[2].Y;
s11 = Vertex[4].Y;
break;
case 3:
s00 = Vertex[0].Y;
s01 = Vertex[1].Y;
s10 = Vertex[4].Y;
s11 = cd.Verts[3].Y;
break;
}
return (s00 * (1-lx) + s01 * lx) * (1 - lz) + (s10 * (1-lx) + s11 * lx) * lz;
}
quadsquare* quadsquare::GetNeighbor(int dir, const quadcornerdata& cd)
{
if (cd.Parent == 0) return 0;
quadsquare* p = 0;
int index = cd.ChildIndex ^ 1 ^ ((dir & 1) << 1);
bool SameParent = ((dir - cd.ChildIndex) & 2) ? true : false;
if (SameParent) {
p = cd.Parent->Square;
} else {
p = cd.Parent->Square->GetNeighbor(dir, *cd.Parent);
if (p == 0) return 0;
}
quadsquare* n = p->Child[index];
return n;
}
float quadsquare::RecomputeError(const quadcornerdata& cd)
{
int i;
int j;
int t;
int half = 1 << cd.Level;
int whole = half << 1;
float terrain_error;
float maxerror = 0;
float e;
int numTerr;
numTerr = Course.numTerr;
if (cd.ChildIndex & 1) {
e = fabs(Vertex[0].Y - (cd.Verts[1].Y + cd.Verts[3].Y) * 0.5);
} else {
e = fabs(Vertex[0].Y - (cd.Verts[0].Y + cd.Verts[2].Y) * 0.5);
}
if (e > maxerror) maxerror = e;
MaxY = Vertex[0].Y;
MinY = Vertex[0].Y;
for (i = 0; i < 4; i++) {
float y = cd.Verts[i].Y;
if (y < MinY) MinY = y;
if (y > MaxY) MaxY = y;
}
e = fabs(Vertex[1].Y - (cd.Verts[0].Y + cd.Verts[3].Y) * 0.5);
if (e > maxerror) maxerror = e;
Error[0] = e;
e = fabs(Vertex[4].Y - (cd.Verts[2].Y + cd.Verts[3].Y) * 0.5);
if (e > maxerror) maxerror = e;
Error[1] = e;
if (cd.Level == 0 && cd.xorg <= RowSize-1 && cd.zorg <= NumRows-1 ) {
int x = cd.xorg + half;
int z = cd.zorg + whole;
int idx = x + z * RowSize;
bool different_terrains = false;
terrain_error = 0.f;
if (x < RowSize && z < NumRows ) {
if (x < RowSize - 1 ) {
if (Terrain[idx] != Terrain[idx+1] ) {
different_terrains = true;
}
}
if (z >= 1 ) {
idx -= RowSize;
if (Terrain[idx] != Terrain[idx+1] ) {
different_terrains = true;
}
}
if (different_terrains ) {
ForceSouthVert = true;
terrain_error = TERRAIN_ERROR_SCALE * whole * whole;
} else {
ForceSouthVert = false;
}
if (terrain_error > Error[0] ) {
Error[0] = terrain_error;
}
if (Error[0] > maxerror ) {
maxerror = Error[0];
}
}
x = cd.xorg + whole;
z = cd.zorg + half;
idx = x + z * RowSize;
terrain_error = 0;
different_terrains = false;
if (x < RowSize && z < NumRows ) {
if (z >= 1 ) {
if (Terrain[idx] != Terrain[idx-RowSize] ) {
different_terrains = true;
}
}
if (z >= 1 && x < RowSize - 1 ) {
idx += 1;
if (Terrain[idx] != Terrain[idx-RowSize] ) {
different_terrains = true;
}
}
if (different_terrains ) {
ForceEastVert = true;
terrain_error = TERRAIN_ERROR_SCALE * whole * whole;
} else {
ForceEastVert = false;
}
if (terrain_error > Error[1] ) {
Error[1] = terrain_error;
}
if (Error[1] > maxerror ) {
maxerror = Error[1];
}
}
}
for (i = 0; i < 4; i++) {
float y = Vertex[1 + i].Y;
if (y < MinY) MinY = y;
if (y > MaxY) MaxY = y;
}
for (i = 0; i < 4; i++) {
quadcornerdata q;
if (Child[i]) {
SetupCornerData(&q, cd, i);
Error[i+2] = Child[i]->RecomputeError(q);
if (Child[i]->MinY < MinY) MinY = Child[i]->MinY;
if (Child[i]->MaxY > MaxY) MaxY = Child[i]->MaxY;
} else {
Error[i+2] = fabs((Vertex[0].Y + cd.Verts[i].Y)
- (Vertex[i+1].Y + Vertex[((i+1)&3) + 1].Y)) * 0.25;
}
if (Error[i+2] > maxerror) maxerror = Error[i+2];
}
int terrain;
int *terrain_count = new int[(int)numTerr];
for (t=0; t<numTerr; t++) {
terrain_count[t] = 0;
}
for (i=cd.xorg; i<=cd.xorg+whole; i++) {
for (j=cd.zorg; j<=cd.zorg+whole; j++) {
if (i < 0 || i >= RowSize ||
j < 0 || j >= NumRows )
{
continue;
}
terrain = (int) Terrain[ i + RowSize*j ];
terrain_count[ terrain ] += 1;
}
}
int max_count = 0;
int max_type = 0;
int total = 0;
for (t=0; t<numTerr; t++) {
if (terrain_count[t] > max_count ) {
max_count = terrain_count[t];
max_type = t;
}
total += terrain_count[t];
}
delete [] terrain_count;
if (total > 0 ) {
terrain_error = (1.0 - max_count / total);
if (numTerr > 1 ) {
terrain_error *= numTerr / (numTerr - 1.0 );
}
} else terrain_error = 0;
terrain_error *= whole * whole;
terrain_error *= TERRAIN_ERROR_SCALE;
if (terrain_error > maxerror ) maxerror = terrain_error;
if (terrain_error > Error[0] ) Error[0] = terrain_error;
if (terrain_error > Error[1] ) Error[1] = terrain_error;
Dirty = false;
return maxerror;
}
void quadsquare::ResetTree()
{
int i;
for (i = 0; i < 4; i++) {
if (Child[i]) {
Child[i]->ResetTree();
if (Child[i]->Static == false) {
delete Child[i];
Child[i] = 0;
}
}
}
EnabledFlags = 0;
SubEnabledCount[0] = 0;
SubEnabledCount[1] = 0;
Dirty = true;
}
void quadsquare::StaticCullData(const quadcornerdata& cd, float ThresholdDetail)
{
ResetTree();
if (Dirty) RecomputeError(cd);
int level;
for (level = 0; level <= cd.Level; level++) {
StaticCullAux(cd, ThresholdDetail, level);
}
}
void quadsquare::StaticCullAux(const quadcornerdata& cd,
float ThresholdDetail, int TargetLevel)
{
int i, j;
quadcornerdata q;
if (cd.Level > TargetLevel) {
for (j = 0; j < 4; j++) {
if (j < 2) i = 1 - j;
else i = j;
if (Child[i]) {
SetupCornerData(&q, cd, i);
Child[i]->StaticCullAux(q, ThresholdDetail, TargetLevel);
}
}
return;
}
float size = 2 << cd.Level; // Edge length.
if (Child[0] == NULL && Child[3] == NULL && Error[0] * ThresholdDetail < size) {
quadsquare* s = GetNeighbor(0, cd);
if (s == NULL || (s->Child[1] == NULL && s->Child[2] == NULL)) {
float y = (cd.Verts[0].Y + cd.Verts[3].Y) * 0.5;
Vertex[1].Y = y;
Error[0] = 0;
if (s) s->Vertex[3].Y = y;
Dirty = true;
}
}
if (Child[2] == NULL && Child[3] == NULL && Error[1] * ThresholdDetail < size) {
quadsquare* s = GetNeighbor(3, cd);
if (s == NULL || (s->Child[0] == NULL && s->Child[1] == NULL)) {
float y = (cd.Verts[2].Y + cd.Verts[3].Y) * 0.5;
Vertex[4].Y = y;
Error[1] = 0;
if (s) s->Vertex[2].Y = y;
Dirty = true;
}
}
bool StaticChildren = false;
for (i = 0; i < 4; i++) {
if (Child[i]) {
StaticChildren = true;
if (Child[i]->Dirty) Dirty = true;
}
}
if (StaticChildren == false && cd.Parent != NULL) {
bool NecessaryEdges = false;
for (i = 0; i < 4; i++) {
float diff = fabs(Vertex[i+1].Y - (cd.Verts[i].Y
+ cd.Verts[(i+3)&3].Y) * 0.5);
if (diff > 0.00001) {
NecessaryEdges = true;
}
}
if (!NecessaryEdges) {
size *= 1.414213562;
if (cd.Parent->Square->Error[2 + cd.ChildIndex] * ThresholdDetail < size) {
delete cd.Parent->Square->Child[cd.ChildIndex];
cd.Parent->Square->Child[cd.ChildIndex] = 0;
}
}
}
}
int MaxCreateDepth = 0;
void quadsquare::EnableEdgeVertex
(int index, bool IncrementCount, const quadcornerdata& cd) {
int ct = 0;
int stack[32];
if ((EnabledFlags & (1 << index)) && IncrementCount == false) return;
EnabledFlags |= 1 << index;
if (IncrementCount == true && (index == 0 || index == 3)) {
SubEnabledCount[index & 1]++;
}
quadsquare* p = this;
const quadcornerdata* pcd = &cd;
for (;;) {
int ci = pcd->ChildIndex;
if (pcd->Parent == NULL || pcd->Parent->Square == NULL) return;
p = pcd->Parent->Square;
pcd = pcd->Parent;
bool SameParent = ((index - ci) & 2) ? true : false;
ci = ci ^ 1 ^ ((index & 1) << 1);
stack[ct] = ci;
ct++;
if (SameParent) break;
}
p = p->EnableDescendant(ct, stack, *pcd);
index ^= 2;
p->EnabledFlags |= (1 << index);
if (IncrementCount == true && (index == 0 || index == 3)) {
p->SubEnabledCount[index & 1]++;
}
}
quadsquare* quadsquare::EnableDescendant(int count, int path[],
const quadcornerdata& cd)
{
count--;
int ChildIndex = path[count];
if ((EnabledFlags & (16 << ChildIndex)) == 0) {
EnableChild(ChildIndex, cd);
}
if (count > 0) {
quadcornerdata q;
SetupCornerData(&q, cd, ChildIndex);
return Child[ChildIndex]->EnableDescendant(count, path, q);
} else {
return Child[ChildIndex];
}
}
void quadsquare::CreateChild(int index, const quadcornerdata& cd)
{
if (Child[index] == 0) {
quadcornerdata q;
SetupCornerData(&q, cd, index);
Child[index] = new quadsquare(&q);
}
}
void quadsquare::EnableChild(int index, const quadcornerdata& cd)
{
if ((EnabledFlags & (16 << index)) == 0) {
EnabledFlags |= (16 << index);
EnableEdgeVertex(index, true, cd);
EnableEdgeVertex((index + 1) & 3, true, cd);
if (Child[index] == 0) {
CreateChild(index, cd);
}
}
}
int BlockDeleteCount = 0;
int BlockUpdateCount = 0;
void quadsquare::NotifyChildDisable(const quadcornerdata& cd, int index)
{
EnabledFlags &= ~(16 << index);
quadsquare* s;
if (index & 2) s = this;
else s = GetNeighbor(1, cd);
if (s) {
s->SubEnabledCount[1]--;
}
if (index == 1 || index == 2) s = GetNeighbor(2, cd);
else s = this;
if (s) {
s->SubEnabledCount[0]--;
}
}
static float DetailThreshold = 100;
bool quadsquare::VertexTest(int x, float y, int z, float error,
const float Viewer[3], int level, vertex_loc_t vertex_loc )
{
float dx = fabs(x - Viewer[0]) * fabs (ScaleX );
float dy = fabs(y - Viewer[1]);
float dz = fabs(z - Viewer[2]) * fabs (ScaleZ );
float d = max (dx, max (dy, dz ) );
if (vertex_loc == South && ForceSouthVert && d < VERTEX_FORCE_THRESHOLD )
{
return true;
}
if (vertex_loc == East && ForceEastVert && d < VERTEX_FORCE_THRESHOLD )
{
return true;
}
if (d < ERROR_MAGNIFICATION_THRESHOLD ) {
error *= ERROR_MAGNIFICATION_AMOUNT;
}
return error * DetailThreshold > d;
}
bool quadsquare::BoxTest(int x, int z, float size, float miny,
float maxy, float error, const float Viewer[3])
{
float half = size * 0.5;
float dx = (fabs(x + half - Viewer[0]) - half ) * fabs(ScaleX);
float dy = fabs((miny + maxy) * 0.5 - Viewer[1]) - (maxy - miny) * 0.5;
float dz = (fabs(z + half - Viewer[2]) - half ) * fabs(ScaleZ);
float d = max (dx, max (dy , dz ) );
if (d < ERROR_MAGNIFICATION_THRESHOLD ) {
error *= ERROR_MAGNIFICATION_AMOUNT;
}
if (error * DetailThreshold > d ) {
return true;
}
if ( (x < RowSize-1 && x+size >= RowSize ) ||
(z < NumRows-1 && z+size >= NumRows ) )
{
return true;
}
return false;
}
void quadsquare::Update (const quadcornerdata& cd,
const float ViewerLocation[3], float Detail)
{
float Viewer[3];
DetailThreshold = Detail;
Viewer[0] = ViewerLocation[0] / ScaleX;
Viewer[1] = ViewerLocation[1];
Viewer[2] = ViewerLocation[2] / ScaleZ;
UpdateAux(cd, Viewer, 0, SomeClip);
}
void quadsquare::UpdateAux (const quadcornerdata& cd,
const float ViewerLocation[3], float CenterError, clip_result_t vis) {
BlockUpdateCount++;
if (vis != NoClip ) {
vis = ClipSquare (cd );
if (vis == NotVisible ) {
return;
}
}
if (Dirty) {
RecomputeError(cd);
}
int half = 1 << cd.Level;
int whole = half << 1;
if ((EnabledFlags & 1) == 0 &&
VertexTest(cd.xorg + whole, Vertex[1].Y, cd.zorg + half,
Error[0], ViewerLocation, cd.Level, East) == true )
{
EnableEdgeVertex(0, false, cd);
}
if ((EnabledFlags & 8) == 0 &&
VertexTest(cd.xorg + half, Vertex[4].Y, cd.zorg + whole,
Error[1], ViewerLocation, cd.Level, South) == true )
{
EnableEdgeVertex(3, false, cd);
}
if (cd.Level > 0) {
if ((EnabledFlags & 32) == 0) {
if (BoxTest(cd.xorg, cd.zorg, half, MinY, MaxY, Error[3],
ViewerLocation) == true) EnableChild(1, cd);
}
if ((EnabledFlags & 16) == 0) {
if (BoxTest(cd.xorg + half, cd.zorg, half, MinY, MaxY,
Error[2], ViewerLocation) == true) EnableChild(0, cd);
}
if ((EnabledFlags & 64) == 0) {
if (BoxTest(cd.xorg, cd.zorg + half, half, MinY, MaxY,
Error[4], ViewerLocation) == true) EnableChild(2, cd);
}
if ((EnabledFlags & 128) == 0) {
if (BoxTest(cd.xorg + half, cd.zorg + half, half, MinY, MaxY,
Error[5], ViewerLocation) == true) EnableChild(3, cd);
}
quadcornerdata q;
if (EnabledFlags & 32) {
SetupCornerData(&q, cd, 1);
Child[1]->UpdateAux(q, ViewerLocation, Error[3], vis);
}
if (EnabledFlags & 16) {
SetupCornerData(&q, cd, 0);
Child[0]->UpdateAux(q, ViewerLocation, Error[2], vis);
}
if (EnabledFlags & 64) {
SetupCornerData(&q, cd, 2);
Child[2]->UpdateAux(q, ViewerLocation, Error[4], vis);
}
if (EnabledFlags & 128) {
SetupCornerData(&q, cd, 3);
Child[3]->UpdateAux(q, ViewerLocation, Error[5], vis);
}
}
if ((EnabledFlags & 1) &&
SubEnabledCount[0] == 0 &&
VertexTest(cd.xorg + whole, Vertex[1].Y, cd.zorg + half,
Error[0], ViewerLocation, cd.Level, East) == false)
{
EnabledFlags &= ~1;
quadsquare* s = GetNeighbor(0, cd);
if (s) s->EnabledFlags &= ~4;
}
if ((EnabledFlags & 8) &&
SubEnabledCount[1] == 0 &&
VertexTest(cd.xorg + half, Vertex[4].Y, cd.zorg + whole,
Error[1], ViewerLocation, cd.Level, South) == false)
{
EnabledFlags &= ~8;
quadsquare* s = GetNeighbor(3, cd);
if (s) s->EnabledFlags &= ~2;
}
if (EnabledFlags == 0 &&
cd.Parent != NULL &&
BoxTest(cd.xorg, cd.zorg, whole, MinY, MaxY, CenterError,
ViewerLocation) == false)
{
cd.Parent->Square->NotifyChildDisable(*cd.Parent, cd.ChildIndex);
}
}
GLuint VertexIndices[9];
int VertexTerrains[9];
void quadsquare::InitVert(int i, int x, int z) {
int idx;
if (x >= RowSize ) x = RowSize-1;
if (z >= NumRows ) z = NumRows - 1;
idx = x + RowSize * z;
VertexIndices[i] = idx;
VertexTerrains[i] = Terrain[idx];
}
GLubyte *VNCArray;
void quadsquare::DrawTris()
{
if (glLockArraysEXT_p) {
int tmp_min_idx = VertexArrayMinIdx;
tmp_min_idx = (tmp_min_idx == 0 ? 1 : tmp_min_idx);
glLockArraysEXT_p (tmp_min_idx, VertexArrayMaxIdx - tmp_min_idx + 1 );
}
glDrawElements (GL_TRIANGLES, VertexArrayCounter,
GL_UNSIGNED_SHORT, VertexArrayIndices );
if (glUnlockArraysEXT_p) {
glUnlockArraysEXT_p();
}
}
void quadsquare::DrawEnvmapTris()
{
#if !defined(HAVE_GL_GLES1)
if (VertexArrayCounter > 0 && EnvmapTexId != 0)
{
static const GLfloat xplane[4] = { 1.0 / COURSE_TEX_SCALE, 0.0, 0.0, 0.0 };
static const GLfloat zplane[4] = { 0.0, 0.0, 1.0 / COURSE_TEX_SCALE, 0.0 };
glEnable (GL_TEXTURE_GEN_S);
glEnable (GL_TEXTURE_GEN_T);
glTexGenfv (GL_S, GL_OBJECT_PLANE, xplane);
glTexGenfv (GL_T, GL_OBJECT_PLANE, zplane);
glTexGeni (GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP );
glTexGeni (GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP );
glBindTexture (GL_TEXTURE_2D, EnvmapTexId );
DrawTris();
glDisable (GL_TEXTURE_GEN_S);
glDisable (GL_TEXTURE_GEN_T);
}
#endif
}
void quadsquare::InitArrayCounters()
{
VertexArrayCounter = 0;
VertexArrayMinIdx = INT_MAX;
VertexArrayMaxIdx = 0;
}
void quadsquare::Render (const quadcornerdata& cd, GLubyte *vnc_array) {
VNCArray = vnc_array;
bool fog_on;
unsigned int i, j;
int nx, ny;
Course.GetDivisions (&nx, &ny );
unsigned int numTerrains;
TTerrType *TerrList = Course.TerrList;
numTerrains = Course.numTerr;
// fog_on = is_fog_on ();
fog_on = true;
for (j=0; j<numTerrains; j++) {
if (TerrList[j].texid > 0) {
InitArrayCounters();
RenderAux (cd, SomeClip, j);
if (VertexArrayCounter == 0) continue;
glBindTexture (GL_TEXTURE_2D, TexId[j] );
DrawTris ();
if (TerrList[j].shiny && param.perf_level > 1) {
glDisableClientState (GL_COLOR_ARRAY);
glDisableClientState (GL_TEXTURE_COORD_ARRAY);
glColor4f (1.0, 1.0, 1.0, ENV_MAP_ALPHA / 255.0 );
DrawEnvmapTris();
glEnableClientState (GL_TEXTURE_COORD_ARRAY);
glEnableClientState (GL_COLOR_ARRAY);
}
}
}
if (param.perf_level > 1) {
InitArrayCounters();
RenderAux (cd, SomeClip, -1 );
if (VertexArrayCounter != 0 ) {
glDisable (GL_FOG );
for (i=0; i<VertexArrayCounter; i++) {
colorval (VertexArrayIndices[i], 0 ) = 0;
colorval (VertexArrayIndices[i], 1 ) = 0;
colorval (VertexArrayIndices[i], 2 ) = 0;
colorval (VertexArrayIndices[i], 3 ) = 255;
}
glBindTexture (GL_TEXTURE_2D, TexId[0] );
DrawTris();
if (fog_on) glEnable (GL_FOG );
glBlendFunc (GL_SRC_ALPHA, GL_ONE );
for (i=0; i<VertexArrayCounter; i++) {
colorval (VertexArrayIndices[i], 0 ) = 255;
colorval (VertexArrayIndices[i], 1 ) = 255;
colorval (VertexArrayIndices[i], 2 ) = 255;
}
for (j=0; j<numTerrains; j++) {
if (TerrList[j].texid > 0) {
glBindTexture (GL_TEXTURE_2D, TexId[j] );
for (i=0; i<VertexArrayCounter; i++) {
colorval (VertexArrayIndices[i], 3 ) =
(Terrain[VertexArrayIndices[i]] == (char)j ) ? 255 : 0;
}
DrawTris();
}
}
/*
if (param.perf_level > 1) {
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
for (i=0; i<VertexArrayCounter; i++) {
colorval (VertexArrayIndices[i], 3 ) =
(TerrList[Terrain[VertexArrayIndices[i]]].shiny) ?
ENV_MAP_ALPHA : 0;
}
DrawEnvmapTris();
}
*/
}
}
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
}
clip_result_t quadsquare::ClipSquare (const quadcornerdata& cd )
{
TVector3 min, max;
clip_result_t clip_result;
int whole = 2 << cd.Level;
if (cd.xorg >= RowSize-1 ) {
return NotVisible;
}
if (cd.zorg >= NumRows-1 ) {
return NotVisible;
}
min.x = cd.xorg * ScaleX;
min.y = MinY;
min.z = cd.zorg * ScaleZ;
max.x = (cd.xorg + whole) * ScaleX;
max.y = MaxY;
max.z = (cd.zorg + whole) * ScaleZ;
if (min.x > max.x ) {
double tmp = min.x;
min.x = max.x;
max.x = tmp;
}
if (min.z > max.z ) {
double tmp = min.z;
min.z = max.z;
max.z = tmp;
}
clip_result = clip_aabb_to_view_frustum(min, max);
if (clip_result == NotVisible || clip_result == SomeClip ) {
return clip_result;
}
if (cd.xorg + whole >= RowSize ) {
return SomeClip;
}
if (cd.zorg + whole >= NumRows ) {
return SomeClip;
}
return clip_result;
}
inline void quadsquare::MakeTri (int a, int b, int c, int terrain )
{
if ( (VertexTerrains[a] == terrain ||
VertexTerrains[b] == terrain ||
VertexTerrains[c] == terrain ) )
{
VertexArrayIndices[VertexArrayCounter++] = VertexIndices[a];
setalphaval(a);
update_min_max (VertexIndices[a] );
VertexArrayIndices[VertexArrayCounter++] = VertexIndices[b];
setalphaval(b);
update_min_max (VertexIndices[b] );
VertexArrayIndices[VertexArrayCounter++] = VertexIndices[c];
setalphaval(c);
update_min_max (VertexIndices[c] );
}
}
inline void quadsquare::MakeSpecialTri (int a, int b, int c, int terrain)
{
if (VertexTerrains[a] != VertexTerrains[b] &&
VertexTerrains[a] != VertexTerrains[c] &&
VertexTerrains[b] != VertexTerrains[c] )
{
VertexArrayIndices[VertexArrayCounter++] = VertexIndices[a];
update_min_max (VertexIndices[a] );
VertexArrayIndices[VertexArrayCounter++] = VertexIndices[b];
update_min_max (VertexIndices[b] );
VertexArrayIndices[VertexArrayCounter++] = VertexIndices[c];
update_min_max (VertexIndices[c] );
}
}
inline void quadsquare::MakeNoBlendTri (int a, int b, int c, int terrain )
{
if ( (VertexTerrains[a] == terrain ||
VertexTerrains[b] == terrain ||
VertexTerrains[c] == terrain ) &&
(VertexTerrains[a] >= terrain &&