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Tessellate terrain chunks at optimal level, using projected bounding box

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This commit is contained in:
Michaël Lemaire 2013-06-27 11:47:16 +02:00
parent 3e42320c3f
commit 390fa99bab
1 changed files with 64 additions and 11 deletions
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75
src/rendering/terrain/ter_raster.c
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@ -3,6 +3,8 @@
#include "ter_raster.h"
#include <stdlib.h>
#include <math.h>
#include "../tools/boundingbox.h"
#include "../renderer.h"
/*
@ -61,8 +63,25 @@ static void _renderQuad(Renderer* renderer, double x, double z, double size, dou
void terrainTessellateChunk(Renderer* renderer, TerrainChunkInfo* chunk, int detail)
{
/* TODO Tessellate ! */
_renderQuad(renderer, chunk->point_nw.x, chunk->point_nw.z, chunk->point_ne.x - chunk->point_nw.x, renderer->water->getHeightInfo(renderer).min_height);
if (detail < 1)
{
return;
}
double water_height = renderer->water->getHeightInfo(renderer).min_height;
double startx = chunk->point_nw.x;
double startz = chunk->point_nw.z;
double size = (chunk->point_ne.x - chunk->point_nw.x) / (double)detail;
int i, j;
for (i = 0; i < detail; i++)
{
for (j = 0; j < detail; j++)
{
_renderQuad(renderer, startx + (double)i * size, startz + (double)j * size, size, water_height);
}
}
}
static void _getChunk(Renderer* renderer, TerrainChunkInfo* chunk, double x, double z, double size, double water_height, int displaced)
@ -72,15 +91,49 @@ static void _getChunk(Renderer* renderer, TerrainChunkInfo* chunk, double x, dou
chunk->point_se = renderer->terrain->getResult(renderer, x + size, z + size, 1, displaced).location;
chunk->point_ne = renderer->terrain->getResult(renderer, x + size, z, 1, displaced).location;
/* TODO If displaced == 0, the detail_hint may be inaccurate (water and screen culling) */
if (chunk->point_nw.y >= water_height || chunk->point_sw.y >= water_height || chunk->point_se.y >= water_height || chunk->point_ne.y >= water_height)
double displacement_power;
if (displaced)
{
/* TODO */
chunk->detail_hint = 5;
displacement_power = 0.0;
}
else
{
displacement_power = texturesGetMaximalDisplacement(renderer->textures->definition);
}
BoundingBox box;
boundingBoxReset(&box);
if (displacement_power > 0.0)
{
boundingBoxPushPoint(&box, v3Add(chunk->point_nw, v3(-displacement_power, displacement_power, -displacement_power)));
boundingBoxPushPoint(&box, v3Add(chunk->point_nw, v3(-displacement_power, -displacement_power, -displacement_power)));
boundingBoxPushPoint(&box, v3Add(chunk->point_sw, v3(-displacement_power, displacement_power, displacement_power)));
boundingBoxPushPoint(&box, v3Add(chunk->point_sw, v3(-displacement_power, -displacement_power, displacement_power)));
boundingBoxPushPoint(&box, v3Add(chunk->point_se, v3(displacement_power, displacement_power, displacement_power)));
boundingBoxPushPoint(&box, v3Add(chunk->point_se, v3(displacement_power, -displacement_power, displacement_power)));
boundingBoxPushPoint(&box, v3Add(chunk->point_ne, v3(displacement_power, displacement_power, -displacement_power)));
boundingBoxPushPoint(&box, v3Add(chunk->point_ne, v3(displacement_power, -displacement_power, -displacement_power)));
}
else
{
boundingBoxPushPoint(&box, chunk->point_nw);
boundingBoxPushPoint(&box, chunk->point_sw);
boundingBoxPushPoint(&box, chunk->point_se);
boundingBoxPushPoint(&box, chunk->point_ne);
}
int coverage = cameraIsUnprojectedBoxInView(renderer->render_camera, &box);
if (coverage > 0)
{
chunk->detail_hint = (int)ceil(sqrt((double)coverage) / (double)(21 - 2 * renderer->render_quality));
if (chunk->detail_hint > 5 * renderer->render_quality)
{
chunk->detail_hint = 5 * renderer->render_quality;
}
}
else
{
/* Not in view */
chunk->detail_hint = -1;
}
}
@ -90,9 +143,6 @@ void terrainGetTessellationInfo(Renderer* renderer, FuncTerrainTessellationCallb
TerrainChunkInfo chunk;
int chunk_factor, chunk_count, i;
Vector3 cam = renderer->getCameraLocation(renderer, VECTOR_ZERO);
double cx = cam.x;
double cz = cam.z;
double water_height;
double progress;
double radius_int, radius_ext;
double base_chunk_size, chunk_size;
@ -106,7 +156,10 @@ void terrainGetTessellationInfo(Renderer* renderer, FuncTerrainTessellationCallb
chunk_size = base_chunk_size;
progress = 0.0; /* TODO */
water_height = renderer->water->getHeightInfo(renderer).min_height;
double cx = cam.x - fmod(cam.x, base_chunk_size);
double cz = cam.z - fmod(cam.x, base_chunk_size);
double water_height = renderer->water->getHeightInfo(renderer).min_height;
while (radius_int < 5000.0)
{