X-Git-Url: http://git.mutantstargoat.com?p=demo;a=blobdiff_plain;f=src%2Fterrain.cc;h=ff54f4603b6336af5b611f48a27f4443d7346858;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hb=fd601d4218b63fdf92c5e4dfa32eac8adbda82fa;hpb=54cc76a89b4221fac1b7f4a58259ca0ce836177d

diff --git a/src/terrain.cc b/src/terrain.cc
index e69de29..ff54f46 100644
--- a/src/terrain.cc
+++ b/src/terrain.cc
@@ -0,0 +1,111 @@
+#include <gmath/gmath.h>
+
+#include "camera.h"
+#include "gfxapi.h"
+#include "image.h"
+#include "mesh.h"
+#include "meshgen.h"
+#include "object.h"
+#include "scene.h"
+#include "terrain.h"
+
+static float calc_height(float u, float v, void *ptr);
+
+Terrain::Terrain()
+{
+	vis_scene = 0;
+}
+
+Terrain::~Terrain()
+{
+}
+
+bool Terrain::init()
+{
+	vis_scene = new Scene;
+
+	return true;
+}
+
+void Terrain::destroy()
+{
+	delete vis_scene;
+}
+
+struct GenData {
+	const TerrainParams *tp;
+	float xoffs;
+	float yoffs;
+};
+
+bool Terrain::generate(const TerrainParams &params)
+{
+	tiles.clear();
+
+	float txsz = params.xsz / params.xtiles;
+	float tysz = params.ysz / params.ytiles;
+
+	for(int i=0; i<params.ytiles; i++) {
+		for(int j=0; j<params.xtiles; j++) {
+			TerrainTile tile;
+			tile.mesh = gfx_create_mesh();
+
+			GenData data;
+			data.tp = &params;
+			data.xoffs = (float)j / (float)params.xtiles;
+			data.yoffs = (float)i / (float)params.ytiles;
+
+			gen_heightfield(tile.mesh, txsz, tysz, params.max_height,
+					params.tile_usub, params.tile_vsub, calc_height,
+					(void*)&data);
+
+			float xoffs = j * txsz - params.xsz / 2.0 + txsz / 2.0;
+			float yoffs = i * tysz - params.ysz / 2.0 + tysz / 2.0;
+
+			Mat4 offmat;
+			offmat.translation(xoffs, 0, yoffs);
+			tile.mesh->transform(offmat);
+
+			tiles.push_back(tile);
+
+/*
+	the terrain scene stores objects only
+	no need to fill the mat, mesh std::vectors
+*/
+			Object *o = new Object;
+			o->mesh = tile.mesh;
+			o->material = &material;
+			o->transform = Mat4::identity;
+
+			vis_scene->objects.push_back(o);
+		}
+	}
+	return true;
+}
+
+Scene *Terrain::get_visible(const Camera *camera) const
+{
+	return vis_scene;
+}
+
+static float calc_height(float u, float v, void *ptr)
+{
+	if(!ptr) {
+		fprintf(stderr, "Terrain parameters not found.\n");
+		return 0;
+	}
+
+	GenData *data = (GenData*)ptr;
+	const TerrainParams *tp = data->tp;
+
+	u = u / tp->xtiles + data->xoffs;
+	v = v / tp->ytiles + data->yoffs;
+
+	float sn = gph::fbm(u * tp->noise_freq, v * tp->noise_freq, tp->num_octaves);
+
+	if(tp->coarse_heightmap) {
+		Vec4 texel = tp->coarse_heightmap->lookup_nearest(u, v);
+		sn *= texel.x;
+	}
+	return sn;
+}
\ No newline at end of file