mirror of
https://github.com/leozide/leocad
synced 2024-12-28 22:23:35 +01:00
874 lines
22 KiB
C++
874 lines
22 KiB
C++
// Terrain: a Bezier surface.
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//
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#include "lc_global.h"
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#include <math.h>
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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#include "opengl.h"
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#include "terrain.h"
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#include "lc_file.h"
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#include "camera.h"
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#include "system.h"
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#include "lc_texture.h"
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/////////////////////////////////////////////////////////////////////////////
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// Static functions
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// Cubic Bezier patch matrix:
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// 1 0 0 0
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// -3 3 0 0
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// 3 -6 3 0
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// -1 3 -3 1
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static float SolveBase(int i, float t)
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{
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switch (i)
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{
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case 0: return (((-t)+3)*t-3)*t+1;
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case 1: return (((3*t)-6)*t+3)*t;
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case 2: return ((-3*t)+3)*t*t;
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case 3: return t*t*t;
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}
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return 0;
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}
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static float SolveDiff(int i, float t)
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{
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switch (i)
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{
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case 0: return ((-3*t)+6)*t-3;
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case 1: return ((9*t)-12)*t+3;
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case 2: return ((-9*t)+6)*t;
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case 3: return 3*t*t;
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}
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return 0;
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}
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/////////////////////////////////////////////////////////////////////////////
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// TerrainPatch functions
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TerrainPatch::TerrainPatch ()
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{
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vertex = NULL;
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normals = NULL;
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coords = NULL;
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index = NULL;
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steps = 10;
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visible = true;
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}
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TerrainPatch::~TerrainPatch ()
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{
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FreeMemory ();
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}
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void TerrainPatch::InitBox(float minX, float maxX, float minY, float maxY, float minZ, float maxZ)
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{
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// Now make each corner point for convenient culling.
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corners[0][0] = minX;
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corners[1][0] = minX;
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corners[2][0] = minX;
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corners[3][0] = minX;
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corners[4][0] = maxX;
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corners[5][0] = maxX;
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corners[6][0] = maxX;
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corners[7][0] = maxX;
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corners[0][1] = minY;
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corners[1][1] = minY;
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corners[2][1] = maxY;
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corners[3][1] = maxY;
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corners[4][1] = minY;
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corners[5][1] = minY;
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corners[6][1] = maxY;
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corners[7][1] = maxY;
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corners[0][2] = minZ;
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corners[1][2] = maxZ;
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corners[2][2] = minZ;
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corners[3][2] = maxZ;
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corners[4][2] = minZ;
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corners[5][2] = maxZ;
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corners[6][2] = minZ;
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corners[7][2] = maxZ;
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}
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bool TerrainPatch::BoxIsOutside(const float plane[4]) const
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{
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float planeEqVal;
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for (int i = 0; i < 8; i++)
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{
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planeEqVal = plane[0] * corners[i][0] + plane[1] * corners[i][1] + plane[2] * corners[i][2] + plane[3];
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if (planeEqVal > 0)
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return false;
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}
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return true;
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}
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#define controlsX(b, a) control[(a*4+b)*3]
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#define controlsY(b, a) control[(a*4+b)*3+1]
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#define controlsZ(b, a) control[(a*4+b)*3+2]
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void TerrainPatch::Tesselate(bool bNormals)
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{
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FreeMemory();
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vertex = new float[steps*steps*3];
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if (bNormals)
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normals = new float[steps*steps*3];
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coords = new float[steps*steps*2];
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float invTotalSteps = 1.0f / (steps - 1);
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for (int stepU = 0; stepU < steps; stepU++)
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{
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// Generate the parameter for this step of the curve.
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float u = stepU * invTotalSteps;
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for (int stepV = 0; stepV < steps; stepV++)
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{
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// Generate the parameter for this step of the curve.
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float v = stepV * invTotalSteps;
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// This holds the point we're working on as we add control points' contributions to it.
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float curPt[3] = { 0, 0, 0 };
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float curNorm[3] = { 0, 0, 0 };
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float curUTan[3] = { 0, 0, 0 };
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float curVTan[3] = { 0, 0, 0 };
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// Generate a point on the curve for this step.
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for (int i = 0; i < 4; i++)
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for (int j = 0; j < 4; j++)
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{
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// Get a few basis function values and products thereof that we'll need.
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float bu = SolveBase(i, u);
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float bv = SolveBase(j, v);
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float dbu = SolveDiff(i, u);
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float dbv = SolveDiff(j, v);
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float bu_bv = bu * bv;
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float bu_dbv = bu * dbv;
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float dbu_bv = dbu * bv;
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// Add this control point's contribution onto the current point.
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curPt[0] += controlsX(i, j) * bu_bv;
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curPt[1] += controlsY(i, j) * bu_bv;
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curPt[2] += controlsZ(i, j) * bu_bv;
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// Add this point's contribution to our u-tangent.
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curUTan[0] += controlsX(i, j) * dbu_bv;
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curUTan[1] += controlsY(i, j) * dbu_bv;
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curUTan[2] += controlsZ(i, j) * dbu_bv;
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// Add this point's contribution to our v-tangent.
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curVTan[0] += controlsX(i, j) * bu_dbv;
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curVTan[1] += controlsY(i, j) * bu_dbv;
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curVTan[2] += controlsZ(i, j) * bu_dbv;
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}
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// Now get our normal as the cross-product of the u and v tangents.
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curNorm[0] = curVTan[1] * curUTan[2] - curVTan[2] * curUTan[1];
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curNorm[1] = curVTan[2] * curUTan[0] - curVTan[0] * curUTan[2];
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curNorm[2] = curVTan[0] * curUTan[1] - curVTan[1] * curUTan[0];
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// Normalize our normal (ouch!)
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float rInv = 1.0f / (float)sqrt(curNorm[0]*curNorm[0] + curNorm[1]*curNorm[1] + curNorm[2]*curNorm[2]);
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curNorm[0] *= rInv;
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curNorm[1] *= rInv;
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curNorm[2] *= rInv;
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// Store these.
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memcpy(&vertex[(stepU+(stepV*steps))*3], curPt, 3*sizeof(float));
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if (bNormals)
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memcpy(&normals[(stepU+(stepV*steps))*3], curNorm, 3*sizeof(float));
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coords[(stepU+(stepV*steps))*2] = u;
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coords[(stepU+(stepV*steps))*2+1] = v;
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}
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}
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index = new unsigned short[(steps-1)*(steps-1)*6];
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for (unsigned short i = 0; i < steps-1; i++)
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for (unsigned short j = 0; j < steps-1; j++)
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{
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index[(i*(steps-1)+j)*6] = i*steps+j;
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index[(i*(steps-1)+j)*6+1] = (i+1)*steps+j;
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index[(i*(steps-1)+j)*6+2] = i*steps+j+1;
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index[(i*(steps-1)+j)*6+3] = (i+1)*steps+j;
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index[(i*(steps-1)+j)*6+4] = (i+1)*steps+j+1;
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index[(i*(steps-1)+j)*6+5] = i*steps+j+1;
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}
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}
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#undef controlsX
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#undef controlsY
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#undef controlsZ
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void TerrainPatch::FreeMemory()
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{
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if (vertex)
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{
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delete[] vertex;
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vertex = NULL;
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}
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if (normals)
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{
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delete[] normals;
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normals = NULL;
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}
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if (coords)
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{
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delete[] coords;
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coords = NULL;
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}
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if (index)
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{
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delete[] index;
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index = NULL;
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}
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}
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/////////////////////////////////////////////////////////////////////////////
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// Terrain construction/destruction
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Terrain::Terrain()
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{
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m_uPatches = 0;
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m_vPatches = 0;
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m_uSize = 50;
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m_vSize = 50;
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m_Patches = NULL;
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m_pControl = NULL;
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m_nOptions = 0;
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m_pTexture = new lcTexture();
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}
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Terrain::~Terrain()
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{
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FreeMemory();
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delete m_pTexture;
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}
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/////////////////////////////////////////////////////////////////////////////
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// Terrain functions
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void Terrain::FileLoad(lcFile* file)
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{
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lcuint8 ch;
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lcuint16 sh;
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lcint32 i, j;
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file->ReadU8(&ch, 1);
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file->ReadS32(&i, 1);
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file->ReadS32(&j, 1);
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file->ReadFloats(&m_uSize, 1);
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file->ReadFloats(&m_vSize, 1);
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file->ReadU32(&m_nOptions, 1);
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file->ReadFloats(m_fColor, 3);
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if (ch == 1)
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{
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file->ReadU8(&ch, 1);
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sh = ch;
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}
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else
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file->ReadU16(&sh, 1);
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if (sh > LC_MAXPATH)
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file->Seek (sh, SEEK_CUR);
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else
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file->ReadBuffer(&m_strTexture, sh);
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SetPatchCount(i, j);
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for (i = 0; i < GetCountU(); i++)
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for (j = 0; j < GetCountV(); j++)
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file->ReadFloats(&m_pControl[i][j*3+2], 1);
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}
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void Terrain::FileSave(lcFile* file)
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{
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lcuint8 version = 2; // LeoCAD 0.70
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lcuint16 sh;
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file->WriteU8(&version, 1);
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file->WriteS32(&m_uPatches, 1);
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file->WriteS32(&m_vPatches, 1);
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file->WriteFloats(&m_uSize, 1);
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file->WriteFloats(&m_vSize, 1);
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file->WriteU32(&m_nOptions, 1);
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file->WriteFloats(m_fColor, 3);
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sh = strlen (m_strTexture);
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file->WriteU16(&sh, 1);
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file->WriteBuffer(m_strTexture, sh);
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for (int i = 0; i < GetCountU(); i++)
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for (int j = 0; j < GetCountV(); j++)
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file->WriteFloats(&m_pControl[i][j*3+2], 1);
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}
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void Terrain::FreeMemory()
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{
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int i;
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if (m_Patches)
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{
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for (i = 0; i < m_uPatches; i++)
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delete[] m_Patches[i];
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delete[] m_Patches;
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m_Patches = NULL;
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}
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if (m_pControl)
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{
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for (i = 0; i < (m_uPatches*3)+1; i++)
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delete[] m_pControl[i];
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delete[] m_pControl;
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m_pControl = NULL;
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}
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}
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// Copy terrain info
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Terrain& Terrain::operator= (const Terrain& source)
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{
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FreeMemory();
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int i;
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m_nOptions = source.m_nOptions;
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strcpy(m_strTexture, source.m_strTexture);
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memcpy(m_fColor, source.m_fColor, sizeof(m_fColor));
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m_uPatches = source.m_uPatches;
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m_vPatches = source.m_vPatches;
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m_Patches = new TerrainPatch*[m_uPatches];
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for (i = 0; i < m_uPatches; i++)
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m_Patches[i] = new TerrainPatch[m_vPatches];
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int uCount = GetCountU(), vCount = GetCountV();
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m_pControl = new float*[uCount];
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for (i = 0; i < uCount; i++)
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{
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m_pControl[i] = new float[vCount*3];
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memcpy(m_pControl[i], source.m_pControl[i], vCount*3*sizeof(float));
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}
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m_uSize = source.m_uSize;
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m_vSize = source.m_vSize;
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SetControlPoints();
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Tesselate();
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return *this;
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}
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void Terrain::GetSize(float *uSize, float *vSize)
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{
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*uSize = m_uSize;
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*vSize = m_vSize;
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}
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void Terrain::SetSize(float uSize, float vSize)
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{
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m_uSize = uSize;
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m_vSize = vSize;
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int i, j, uCount = GetCountU(), vCount = GetCountV();
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for (i = 0; i < uCount; i++)
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for (j = 0; j < vCount; j++)
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{
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m_pControl[i][j*3] = m_uSize * ((float)i/(uCount-1)-0.5f);
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m_pControl[i][j*3+1] = m_vSize * ((float)j/(vCount-1)-0.5f);
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}
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SetControlPoints();
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Tesselate();
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}
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void Terrain::GetPatchCount(int *uCount, int *vCount)
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{
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*uCount = m_uPatches;
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*vCount = m_vPatches;
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}
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void Terrain::SetPatchCount(int uPatches, int vPatches)
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{
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if (uPatches == m_uPatches && vPatches == m_vPatches)
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return;
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float** oldControl = m_pControl;
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int i, j, uCount = uPatches*3+1, vCount = vPatches*3+1;
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int uCountOld = m_uPatches != 0 ? m_uPatches*3+1 : 0, vCountOld = m_vPatches != 0 ? m_vPatches*3+1 : 0;
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// allocate new arrays
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// if (uPatches != m_uPatches)
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m_pControl = new float*[uCount];
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if (m_vPatches != vPatches)
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{
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for (i = 0; i < uCount; i++)
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m_pControl[i] = new float[vCount*3];
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}
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else
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{
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for (i = 0; (i < uCount) && (i < uCountOld); i++)
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m_pControl[i] = oldControl[i];
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for (i = uCountOld; i < uCount; i++)
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m_pControl[i] = new float[vCount*3];
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}
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// set the points
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for (i = 0; i < uCount; i++)
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{
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for (j = 0; j < vCount; j++)
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{
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m_pControl[i][j*3] = m_uSize * ((float)i/(uCount-1)-0.5f);
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m_pControl[i][j*3+1] = m_vSize * ((float)j/(vCount-1)-0.5f);
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if (i < uCountOld && j < vCountOld)
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m_pControl[i][j*3+2] = oldControl[i][j*3+2];
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else
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m_pControl[i][j*3+2] = 0;
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}
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}
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if (m_vPatches != vPatches)
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{
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for (i = 0; i < uCountOld; i++)
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delete[] oldControl[i];
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}
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else
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{
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for (i = uCount; i < uCountOld; i++)
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delete[] oldControl[i];
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}
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// if ((uPatches != m_uPatches) && (oldControl != NULL))
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delete[] oldControl;
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if (m_Patches)
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{
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for (i = 0; i < m_uPatches; i++)
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{
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for (j = 0; j < m_vPatches; j++)
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m_Patches[i][j].FreeMemory();
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delete[] m_Patches[i];
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}
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delete[] m_Patches;
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}
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m_uPatches = uPatches;
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m_vPatches = vPatches;
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m_Patches = new TerrainPatch*[m_uPatches];
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for (i = 0; i < m_uPatches; i++)
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m_Patches[i] = new TerrainPatch[m_vPatches];
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SetControlPoints();
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Tesselate();
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}
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// Set the control points for each patch
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void Terrain::SetControlPoints()
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{
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int i, j;
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for (i = 0; i < m_uPatches; i++)
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for (j = 0; j < m_vPatches; j++)
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{
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///////////
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m_Patches[i][j].FreeMemory();
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float minX = 9999999, maxX = -9999999, minY = 9999999, maxY = -9999999, minZ = 9999999, maxZ = -9999999;
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for (int a = 0; a < 4; a++)
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for (int b = 0; b < 4; b++)
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{
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m_Patches[i][j].control[(a*4+b)*3] = m_pControl[i*(4-1)+a][(j*(4-1)+b)*3];
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m_Patches[i][j].control[(a*4+b)*3+1] = m_pControl[i*(4-1)+a][(j*(4-1)+b)*3+1];
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m_Patches[i][j].control[(a*4+b)*3+2] = m_pControl[i*(4-1)+a][(j*(4-1)+b)*3+2];
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minX = lcMin(minX, m_Patches[i][j].control[(a*4+b)*3]);
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maxX = lcMax(maxX, m_Patches[i][j].control[(a*4+b)*3]);
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minY = lcMin(minY, m_Patches[i][j].control[(a*4+b)*3+1]);
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maxY = lcMax(maxY, m_Patches[i][j].control[(a*4+b)*3+1]);
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minZ = lcMin(minZ, m_Patches[i][j].control[(a*4+b)*3+2]);
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maxZ = lcMax(maxZ, m_Patches[i][j].control[(a*4+b)*3+2]);
|
|
}
|
|
m_Patches[i][j].InitBox(minX, maxX, minY, maxY, minZ, maxZ);
|
|
}
|
|
}
|
|
|
|
// Generate mesh and store for later use.
|
|
void Terrain::Tesselate()
|
|
{
|
|
int i, j, a, steps = 10;
|
|
float x, y, z, inv;
|
|
|
|
for (i = 0; i < m_uPatches; i++)
|
|
for (j = 0; j < m_vPatches; j++)
|
|
m_Patches[i][j].Tesselate((m_nOptions & LC_TERRAIN_SMOOTH) != 0);
|
|
|
|
if ((m_nOptions & LC_TERRAIN_SMOOTH) != 0)
|
|
{
|
|
// fix normals at +u
|
|
for (i = 0; i < m_uPatches-1; i++)
|
|
for (j = 0; j < m_vPatches; j++)
|
|
for (a = 0; a < steps; a++)
|
|
{
|
|
x = m_Patches[i][j].normals[((steps-1)*steps+a)*3] + m_Patches[i+1][j].normals[a*3];
|
|
y = m_Patches[i][j].normals[((steps-1)*steps+a)*3+1] + m_Patches[i+1][j].normals[a*3+1];
|
|
z = m_Patches[i][j].normals[((steps-1)*steps+a)*3+2] + m_Patches[i+1][j].normals[a*3+2];
|
|
|
|
inv = 1.0f / (float)sqrt(x*x + y*y + z*z);
|
|
x *= inv;
|
|
y *= inv;
|
|
z *= inv;
|
|
|
|
m_Patches[i][j].normals[((steps-1)*steps+a)*3] = x;
|
|
m_Patches[i][j].normals[((steps-1)*steps+a)*3+1] = y;
|
|
m_Patches[i][j].normals[((steps-1)*steps+a)*3+2] = z;
|
|
m_Patches[i+1][j].normals[a*3] = x;
|
|
m_Patches[i+1][j].normals[a*3+1] = y;
|
|
m_Patches[i+1][j].normals[a*3+2] = z;
|
|
}
|
|
|
|
// and at +v
|
|
for (i = 0; i < m_uPatches; i++)
|
|
for (j = 0; j < m_vPatches-1; j++)
|
|
for (a = 0; a < steps; a++)
|
|
{
|
|
x = m_Patches[i][j].normals[((steps-1)+a*steps)*3] + m_Patches[i][j+1].normals[(a*steps)*3];
|
|
y = m_Patches[i][j].normals[((steps-1)+a*steps)*3+1] + m_Patches[i][j+1].normals[(a*steps)*3+1];
|
|
z = m_Patches[i][j].normals[((steps-1)+a*steps)*3+2] + m_Patches[i][j+1].normals[(a*steps)*3+2];
|
|
|
|
inv = 1.0f / (float)sqrt(x*x + y*y + z*z);
|
|
x *= inv;
|
|
y *= inv;
|
|
z *= inv;
|
|
|
|
m_Patches[i][j].normals[((steps-1)+a*steps)*3] = x;
|
|
m_Patches[i][j].normals[((steps-1)+a*steps)*3+1] = y;
|
|
m_Patches[i][j].normals[((steps-1)+a*steps)*3+2] = z;
|
|
m_Patches[i][j+1].normals[(a*steps)*3] = x;
|
|
m_Patches[i][j+1].normals[(a*steps)*3+1] = y;
|
|
m_Patches[i][j+1].normals[(a*steps)*3+2] = z;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Terrain::Render(Camera* pCam, float aspect)
|
|
{
|
|
if (m_nOptions & LC_TERRAIN_FLAT)
|
|
{
|
|
const lcVector3& eye = pCam->mPosition;
|
|
glPushMatrix();
|
|
glTranslatef(eye[0], eye[1], 0);
|
|
glScalef(pCam->m_zFar, pCam->m_zFar, 1);
|
|
|
|
if (m_nOptions & LC_TERRAIN_TEXTURE)
|
|
{
|
|
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
|
glBindTexture(GL_TEXTURE_2D, m_pTexture->mTexture);
|
|
glEnable(GL_TEXTURE_2D);
|
|
|
|
float tw = 15.0f, th = 15.0f;
|
|
// tw = 2*pCam->m_zFar/m_nBackgroundSize;
|
|
// th = 2*pCam->m_zFar/m_nBackgroundSize;
|
|
|
|
float tx, ty;
|
|
tx = (tw*eye[0])/(2*pCam->m_zFar);
|
|
ty = (th*eye[1])/(2*pCam->m_zFar);
|
|
|
|
glEnableClientState(GL_VERTEX_ARRAY);
|
|
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
|
|
|
|
float Quad[20] =
|
|
{
|
|
-1.0f, -1.0f, 0.0f, tx, ty,
|
|
1.0f, -1.0f, 0.0f, tx + tw, ty,
|
|
1.0f, 1.0f, 0.0f, tx + tw, ty + th,
|
|
-1.0f, 1.0f, 0.0f, tx, ty + th
|
|
};
|
|
|
|
glVertexPointer(3, GL_FLOAT, 5 * sizeof(float), Quad);
|
|
glTexCoordPointer(2, GL_FLOAT, 5 * sizeof(float), Quad + 3);
|
|
|
|
glDrawArrays(GL_QUADS, 0, 4);
|
|
|
|
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
|
|
glDisableClientState(GL_VERTEX_ARRAY);
|
|
|
|
glDisable(GL_TEXTURE_2D);
|
|
}
|
|
else
|
|
{
|
|
float Quad[12] =
|
|
{
|
|
-1.0f, -1.0f, 0.0f,
|
|
1.0f, -1.0f, 0.0f,
|
|
1.0f, 1.0f, 0.0f,
|
|
-1.0f, 1.0f, 0.0f,
|
|
};
|
|
|
|
glColor4f(m_fColor[0], m_fColor[1], m_fColor[2], 1.0f);
|
|
|
|
glEnableClientState(GL_VERTEX_ARRAY);
|
|
glVertexPointer(3, GL_FLOAT, 0, Quad);
|
|
|
|
glDrawArrays(GL_QUADS, 0, 4);
|
|
|
|
glDisableClientState(GL_VERTEX_ARRAY);
|
|
}
|
|
|
|
glPopMatrix();
|
|
}
|
|
else
|
|
{
|
|
FindVisiblePatches(pCam, aspect);
|
|
|
|
int i, j;
|
|
glColor4f(m_fColor[0], m_fColor[1], m_fColor[2], 1.0f);
|
|
glEnableClientState(GL_VERTEX_ARRAY);
|
|
|
|
if (m_nOptions & LC_TERRAIN_TEXTURE)
|
|
{
|
|
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
|
|
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
|
glBindTexture(GL_TEXTURE_2D, m_pTexture->mTexture);
|
|
glEnable(GL_TEXTURE_2D);
|
|
}
|
|
|
|
if (m_nOptions & LC_TERRAIN_SMOOTH)
|
|
glEnableClientState(GL_NORMAL_ARRAY);
|
|
|
|
for (i = 0; i < m_uPatches; i++)
|
|
for (j = 0; j < m_vPatches; j++)
|
|
if (m_Patches[i][j].visible)
|
|
{
|
|
glVertexPointer(3, GL_FLOAT, 0, m_Patches[i][j].vertex);
|
|
|
|
if (m_nOptions & LC_TERRAIN_SMOOTH)
|
|
glNormalPointer(GL_FLOAT, 0, m_Patches[i][j].normals);
|
|
|
|
if (m_nOptions & LC_TERRAIN_TEXTURE)
|
|
glTexCoordPointer(2, GL_FLOAT, 0, m_Patches[i][j].coords);
|
|
|
|
glDrawElements(GL_TRIANGLES, (m_Patches[i][j].steps-1)*(m_Patches[i][j].steps-1)*6, GL_UNSIGNED_SHORT, m_Patches[i][j].index);
|
|
}
|
|
|
|
if (m_nOptions & LC_TERRAIN_SMOOTH)
|
|
glDisableClientState(GL_NORMAL_ARRAY);
|
|
|
|
if (m_nOptions & LC_TERRAIN_TEXTURE)
|
|
{
|
|
glDisable(GL_TEXTURE_2D);
|
|
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
|
|
}
|
|
|
|
glDisableClientState(GL_VERTEX_ARRAY);
|
|
}
|
|
}
|
|
|
|
void Terrain::FindVisiblePatches(Camera* pCam, float aspect)
|
|
{
|
|
// Get camera position information.
|
|
const lcVector3& eye = pCam->mPosition;
|
|
|
|
// Get perspective information.
|
|
float alpha = pCam->m_fovy / 2.0f * LC_DTOR;
|
|
float halfFovY = pCam->m_fovy / 2.0f * LC_DTOR;
|
|
float halfFovX = (float)atan(tan(halfFovY) * aspect);
|
|
float beta = 2.0f * halfFovX;
|
|
|
|
// Get vector stuff from the position.
|
|
const lcVector3& nonOrthoTop = pCam->mUpVector;
|
|
const lcVector3& target = pCam->mTargetPosition;
|
|
float front[3] = { target[0] - eye[0], target[1] - eye[1], target[2] - eye[2]};
|
|
lcVector3 side;
|
|
side[0] = nonOrthoTop[1]*front[2] - nonOrthoTop[2]*front[1];
|
|
side[1] = nonOrthoTop[2]*front[0] - nonOrthoTop[0]*front[2];
|
|
side[2] = nonOrthoTop[0]*front[1] - nonOrthoTop[1]*front[0];
|
|
|
|
// Make sure our up vector is orthogonal.
|
|
lcVector3 top;
|
|
top[0] = front[1]*side[2] - front[2]*side[1];
|
|
top[1] = front[2]*side[0] - front[0]*side[2];
|
|
top[2] = front[0]*side[1] - front[1]*side[0];
|
|
|
|
// Get our plane normals.
|
|
lcMatrix44 mat;
|
|
lcVector3 topNormal(-top[0], -top[1], -top[2]);
|
|
mat = lcMatrix44FromAxisAngle(side, -alpha);
|
|
topNormal = lcMul30(topNormal, mat);
|
|
|
|
lcVector3 bottomNormal(top);
|
|
mat = lcMatrix44FromAxisAngle(side, alpha);
|
|
bottomNormal = lcMul30(bottomNormal, mat);
|
|
|
|
lcVector3 rightNormal(side);
|
|
mat = lcMatrix44FromAxisAngle(top, -beta);
|
|
rightNormal = lcMul30(rightNormal, mat);
|
|
|
|
lcVector3 leftNormal(-side[0], -side[1], -side[2]);
|
|
mat = lcMatrix44FromAxisAngle(top, beta);
|
|
leftNormal = lcMul30(leftNormal, mat);
|
|
|
|
float nearNormal[3] = { front[0], front[1], front[2] };
|
|
|
|
// Now calculate our plane offsets from the normals and the eye position.
|
|
float topD = eye[0]*-topNormal[0] + eye[1]*-topNormal[1] + eye[2]*-topNormal[2];
|
|
float bottomD = eye[0]*-bottomNormal[0] + eye[1]*-bottomNormal[1] + eye[2]*-bottomNormal[2];
|
|
float leftD = eye[0]*-leftNormal[0] + eye[1]*-leftNormal[1] + eye[2]*-leftNormal[2];
|
|
float rightD = eye[0]*-rightNormal[0] + eye[1]*-rightNormal[1] + eye[2]*-rightNormal[2];
|
|
float nearD = eye[0]*-nearNormal[0] + eye[1]*-nearNormal[1] + eye[2]*-nearNormal[2];
|
|
|
|
// For the far plane, find the point farDist away from the eye along the front vector.
|
|
float farDist = pCam->m_zFar;
|
|
float farPt[3] = { front[0], front[1], front[2] };
|
|
float invR = farDist/(float)sqrt(farPt[0]*farPt[0]+farPt[1]*farPt[1]+farPt[2]*farPt[2]);
|
|
farPt[0] = farPt[0]*invR;
|
|
farPt[1] = farPt[1]*invR;
|
|
farPt[2] = farPt[2]*invR;
|
|
farPt[0] += eye[0];
|
|
farPt[1] += eye[1];
|
|
farPt[2] += eye[2];
|
|
float farD = farPt[0]*nearNormal[0] + farPt[1]*nearNormal[1] + farPt[2]*nearNormal[2];
|
|
|
|
// Now generate the planes
|
|
invR = 1.0f/(float)sqrt(topNormal[0]*topNormal[0]+topNormal[1]*topNormal[1]+topNormal[2]*topNormal[2]);
|
|
float topPlane[4] = { topNormal[0]*invR, topNormal[1]*invR, topNormal[2]*invR, topD*invR };
|
|
invR = 1.0f/(float)sqrt(bottomNormal[0]*bottomNormal[0]+bottomNormal[1]*bottomNormal[1]+bottomNormal[2]*bottomNormal[2]);
|
|
float bottomPlane[4] = { bottomNormal[0]*invR, bottomNormal[1]*invR, bottomNormal[2]*invR, bottomD*invR };
|
|
invR = 1.0f/(float)sqrt(leftNormal[0]*leftNormal[0]+leftNormal[1]*leftNormal[1]+leftNormal[2]*leftNormal[2]);
|
|
float leftPlane[4] = { leftNormal[0]*invR, leftNormal[1]*invR, leftNormal[2]*invR, leftD*invR };
|
|
invR = 1.0f/(float)sqrt(rightNormal[0]*rightNormal[0]+rightNormal[1]*rightNormal[1]+rightNormal[2]*rightNormal[2]);
|
|
float rightPlane[4] = { rightNormal[0]*invR, rightNormal[1]*invR, rightNormal[2]*invR, rightD*invR };
|
|
invR = 1.0f/(float)sqrt(nearNormal[0]*nearNormal[0]+nearNormal[1]*nearNormal[1]+nearNormal[2]*nearNormal[2]);
|
|
float nearPlane[4] = { nearNormal[0]*invR, nearNormal[1]*invR, nearNormal[2]*invR, nearD*invR };
|
|
invR = 1.0f/(float)sqrt(-nearNormal[0]*-nearNormal[0]+-nearNormal[1]*-nearNormal[1]+-nearNormal[2]*-nearNormal[2]);
|
|
float farPlane[4] = { -nearNormal[0]*invR, -nearNormal[1]*invR, -nearNormal[2]*invR, farD*invR };
|
|
|
|
for (int i = 0; i < m_uPatches; i++)
|
|
{
|
|
for (int j = 0; j < m_vPatches; j++)
|
|
{
|
|
m_Patches[i][j].visible = true;
|
|
|
|
if (m_Patches[i][j].BoxIsOutside(leftPlane))
|
|
{
|
|
m_Patches[i][j].visible = false;
|
|
continue;
|
|
}
|
|
|
|
if (m_Patches[i][j].BoxIsOutside(rightPlane))
|
|
{
|
|
m_Patches[i][j].visible = false;
|
|
continue;
|
|
}
|
|
|
|
if (m_Patches[i][j].BoxIsOutside(nearPlane))
|
|
{
|
|
m_Patches[i][j].visible = false;
|
|
continue;
|
|
}
|
|
|
|
if (m_Patches[i][j].BoxIsOutside(farPlane))
|
|
{
|
|
m_Patches[i][j].visible = false;
|
|
continue;
|
|
}
|
|
|
|
if (m_Patches[i][j].BoxIsOutside(bottomPlane))
|
|
{
|
|
m_Patches[i][j].visible = false;
|
|
continue;
|
|
}
|
|
|
|
if (m_Patches[i][j].BoxIsOutside(topPlane))
|
|
{
|
|
m_Patches[i][j].visible = false;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Terrain::LoadDefaults(bool bLinear)
|
|
{
|
|
unsigned long rgb = Sys_ProfileLoadInt ("Default", "Floor", RGB (0,191,0));
|
|
m_fColor[0] = (float)((unsigned char) (rgb))/255;
|
|
m_fColor[1] = (float)((unsigned char) (((unsigned short) (rgb)) >> 8))/255;
|
|
m_fColor[2] = (float)((unsigned char) ((rgb) >> 16))/255;
|
|
|
|
m_uSize = 50;
|
|
m_vSize = 50;
|
|
|
|
strcpy (m_strTexture, Sys_ProfileLoadString ("Default", "FloorBMP", ""));
|
|
m_pTexture->Unload();
|
|
|
|
m_nOptions = LC_TERRAIN_FLAT;
|
|
if (strlen(m_strTexture))
|
|
{
|
|
m_nOptions |= LC_TERRAIN_TEXTURE;
|
|
LoadTexture();
|
|
}
|
|
|
|
SetPatchCount(4, 4);
|
|
|
|
for (int i = 0; i < 13; i++)
|
|
for (int j = 0; j < 13; j++)
|
|
{
|
|
m_pControl[i][j*3] = m_uSize * ((float)i/12-0.5f);
|
|
m_pControl[i][j*3+1] = m_vSize * ((float)j/12-0.5f);
|
|
m_pControl[i][j*3+2] = 0;
|
|
}
|
|
|
|
SetControlPoints();
|
|
Tesselate();
|
|
}
|
|
|
|
void Terrain::LoadTexture()
|
|
{
|
|
m_pTexture->Unload();
|
|
|
|
if ((m_nOptions & LC_TERRAIN_TEXTURE) == 0)
|
|
return;
|
|
|
|
if (m_pTexture->Load(m_strTexture, LC_TEXTURE_WRAPU | LC_TEXTURE_WRAPV | LC_TEXTURE_MIPMAPS) == false)
|
|
{
|
|
// AfxMessageBox("Could not load terrain texture.", MB_OK|MB_ICONEXCLAMATION);
|
|
m_nOptions &= ~LC_TERRAIN_TEXTURE;
|
|
}
|
|
}
|
|
|
|
void Terrain::GenerateRandom()
|
|
{
|
|
srand((unsigned)time(NULL));
|
|
|
|
int uCount = (m_uPatches*3)+1, vCount = (m_vPatches*3)+1;
|
|
|
|
for (int i = 0; i < uCount; i++)
|
|
for (int j = 0; j < vCount; j++)
|
|
{
|
|
m_pControl[i][j*3] = m_uSize * ((float)i/(uCount-1)-0.5f);
|
|
m_pControl[i][j*3+1] = m_vSize * ((float)j/(vCount-1)-0.5f);
|
|
m_pControl[i][j*3+2] = (((float)rand()/(float)RAND_MAX) - 0.5f) * 8;
|
|
}
|
|
|
|
SetControlPoints();
|
|
Tesselate();
|
|
}
|