| 1 | #include "SkyPreetham.h"
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| 2 | #include "common.h"
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| 3 | #include "Vector3.h"
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| 4 | #include "SceneEntity.h"
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| 5 | #include "Transform3.h"
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| 6 | #include "Camera.h"
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| 7 | #include "RenderState.h"
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| 8 |
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| 9 |
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| 10 | #ifdef _CRT_SET
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| 11 | #define _CRTDBG_MAP_ALLOC
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| 12 | #include <stdlib.h>
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| 13 | #include <crtdbg.h>
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| 14 |
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| 15 | // redefine new operator
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| 16 | #define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
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| 17 | #define new DEBUG_NEW
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| 18 | #endif
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| 19 |
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| 20 |
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| 21 | using namespace CHCDemoEngine;
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| 22 | using namespace std;
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| 23 |
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| 24 |
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| 25 | static CGprogram sCgSkyProgram = NULL;
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| 26 | static CGprogram sCgMrtFragmentSkyDomeProgram = NULL;
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| 27 |
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| 28 |
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| 29 | static CGparameter sLightDirParam;
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| 30 | static CGparameter sThetaSunParam;
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| 31 | static CGparameter sZenithColorParam;
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| 32 | static CGparameter sAColorParam;
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| 33 | static CGparameter sBColorParam;
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| 34 | static CGparameter sCColorParam;
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| 35 | static CGparameter sDColorParam;
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| 36 | static CGparameter sEColorParam;
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| 37 | static CGparameter sMultiplierParam;
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| 38 |
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| 39 | ShaderContainer SkyPreetham::sShaders;
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| 40 |
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| 41 |
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| 42 | inline float CBQ(float x)
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| 43 | {
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| 44 | return x * x * x;
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| 45 | }
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| 46 |
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| 47 |
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| 48 | inline float SQR(float x)
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| 49 | {
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| 50 | return x * x ;
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| 51 | }
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| 52 |
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| 53 |
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| 54 | void SkyPreetham::InitCG(CGcontext context)
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| 55 | {
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| 56 | ShaderProgram *pr;
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| 57 |
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| 58 | sCgSkyProgram =
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| 59 | cgCreateProgramFromFile(context,
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| 60 | CG_SOURCE,
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| 61 | "src/shaders/sky_preetham.cg",
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| 62 | RenderState::sCgVertexProfile,
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| 63 | "default_vs",
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| 64 | NULL);
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| 65 |
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| 66 | if (sCgSkyProgram != NULL)
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| 67 | {
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| 68 | cgGLLoadProgram(sCgSkyProgram);
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| 69 |
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| 70 | sLightDirParam = cgGetNamedParameter(sCgSkyProgram, "lightDir");
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| 71 | sThetaSunParam = cgGetNamedParameter(sCgSkyProgram, "thetaSun");
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| 72 | sZenithColorParam = cgGetNamedParameter(sCgSkyProgram, "zenithColor");
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| 73 | sAColorParam = cgGetNamedParameter(sCgSkyProgram, "aColor");
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| 74 | sBColorParam = cgGetNamedParameter(sCgSkyProgram, "bColor");
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| 75 | sCColorParam = cgGetNamedParameter(sCgSkyProgram, "cColor");
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| 76 | sDColorParam = cgGetNamedParameter(sCgSkyProgram, "dColor");
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| 77 | sEColorParam = cgGetNamedParameter(sCgSkyProgram, "eColor");
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| 78 |
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| 79 | sMultiplierParam = cgGetNamedParameter(sCgSkyProgram, "multiplier");
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| 80 |
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| 81 | pr = new ShaderProgram(sCgSkyProgram);
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| 82 | sShaders.push_back(pr);
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| 83 | }
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| 84 | else
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| 85 | cerr << "sky program failed to load" << endl;
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| 86 |
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| 87 | sCgMrtFragmentSkyDomeProgram =
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| 88 | cgCreateProgramFromFile(context,
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| 89 | CG_SOURCE,
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| 90 | "src/shaders/sky_preetham.cg",
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| 91 | RenderState::sCgFragmentProfile,
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| 92 | "frag_skydome",
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| 93 | NULL);
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| 94 |
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| 95 | if (sCgMrtFragmentSkyDomeProgram != NULL)
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| 96 | {
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| 97 | cgGLLoadProgram(sCgMrtFragmentSkyDomeProgram);
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| 98 | //cgGLSetParameter1f(sMaxDepthParam, MAX_DEPTH_CONST / farDist);
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| 99 |
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| 100 | pr = new ShaderProgram(sCgMrtFragmentSkyDomeProgram);
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| 101 | sShaders.push_back(pr);
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| 102 | }
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| 103 | else
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| 104 | cerr << "fragment skyprogram failed to load" << endl;
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| 105 | }
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| 106 |
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| 107 |
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| 108 | void SkyPreetham::ReleaseCG()
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| 109 | {
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| 110 | CLEAR_CONTAINER(sShaders);
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| 111 | }
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| 112 |
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| 113 |
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| 114 | SkyPreetham::SkyPreetham(float turbitity, SceneEntity *skyDome):
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| 115 | mSkyDome(skyDome),
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| 116 | mTurbidity(turbitity)
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| 117 | //, mSunQuad(NULL)
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| 118 | {
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| 119 | CreateSunQuad();
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| 120 | }
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| 121 |
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| 122 |
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| 123 | SkyPreetham::~SkyPreetham()
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| 124 | {
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| 125 | //DEL_PTR(mSunQuad);
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| 126 | }
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| 127 |
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| 128 |
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| 129 | void SkyPreetham::RenderSkyDome(const Vector3 &sunDir,
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| 130 | Camera *camera,
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| 131 | RenderState *state,
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| 132 | bool scaleToRange)
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| 133 | {
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| 134 | pair<float, float> sun_theta;
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| 135 | Vector3 zenithColor;
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| 136 | vector<Vector3> ABCDE;
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| 137 | ComputeFactors(sunDir, zenithColor, ABCDE, sun_theta);
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| 138 |
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| 139 | // Move skybox with camera.
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| 140 | Vector3 position = camera->GetPosition();
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| 141 |
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| 142 | const float scaleFactor = 80.0f;
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| 143 | //const float scaleFactor = 5.0f;
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| 144 |
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| 145 | position.z -= 3 * scaleFactor;
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| 146 | Matrix4x4 m = TranslationMatrix(position);
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| 147 |
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| 148 | Matrix4x4 s = ScaleMatrix(scaleFactor, scaleFactor, scaleFactor);
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| 149 | mSkyDome->GetTransform()->SetMatrix(s * m);
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| 150 |
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| 151 | cgGLSetParameter3f(sLightDirParam, sunDir.x, sunDir.y, sunDir.z);
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| 152 | cgGLSetParameter2f(sThetaSunParam, sun_theta.first, sun_theta.second);
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| 153 | cgGLSetParameter3f(sZenithColorParam, zenithColor.x, zenithColor.y, zenithColor.z);
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| 154 |
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| 155 | cgGLSetParameter3f(sAColorParam, ABCDE[0].x, ABCDE[0].y, ABCDE[0].z);
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| 156 | cgGLSetParameter3f(sBColorParam, ABCDE[1].x, ABCDE[1].y, ABCDE[1].z);
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| 157 | cgGLSetParameter3f(sCColorParam, ABCDE[2].x, ABCDE[2].y, ABCDE[2].z);
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| 158 | cgGLSetParameter3f(sDColorParam, ABCDE[3].x, ABCDE[3].y, ABCDE[3].z);
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| 159 | cgGLSetParameter3f(sEColorParam, ABCDE[4].x, ABCDE[4].y, ABCDE[4].z);
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| 160 |
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| 161 | if (state->GetRenderPassType() == RenderState::DEFERRED)
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| 162 | {
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| 163 | cgGLEnableProfile(RenderState::sCgFragmentProfile);
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| 164 | cgGLBindProgram(sCgMrtFragmentSkyDomeProgram);
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| 165 |
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| 166 | }
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| 167 |
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| 168 | if (!scaleToRange)
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| 169 | {
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| 170 | // use tone mapping
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| 171 | cgGLSetParameter1f(sMultiplierParam, 1.0f);
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| 172 | }
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| 173 | else
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| 174 | {
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| 175 | // no tone mapping => scale
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| 176 | cgGLSetParameter1f(sMultiplierParam, 8e-5f);
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| 177 | }
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| 178 |
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| 179 | cgGLEnableProfile(RenderState::sCgVertexProfile);
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| 180 | cgGLBindProgram(sCgSkyProgram);
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| 181 |
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| 182 | // Render sky dome.
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| 183 | mSkyDome->Render(state);
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| 184 |
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| 185 | // Render additively blended sun disc.
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| 186 | //RenderSunDisk(sunDir, camera);
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| 187 |
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| 188 | cgGLDisableProfile(RenderState::sCgFragmentProfile);
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| 189 | }
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| 190 |
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| 191 |
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| 192 | void SkyPreetham::RenderSunDisk(const Vector3 &sunDir, Camera *camera)
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| 193 | {
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| 194 | // Move skybox with camera.
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| 195 | Vector3 position = camera->GetPosition();
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| 196 |
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| 197 | const float scaleFactor = 100.0f;
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| 198 | position.z -= 10 * scaleFactor;
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| 199 |
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| 200 | // Set world matrix to sun disc position.
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| 201 | Matrix4x4 sunPos = TranslationMatrix(position);
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| 202 |
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| 203 | Vector3 ndir = -Normalize(sunDir);
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| 204 |
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| 205 | const float pitch = -atan2(ndir.x, ndir.y);
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| 206 | const float yaw = atan2(ndir.z, sqrt((ndir.x * ndir.x) + (ndir.y * ndir.y)));
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| 207 |
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| 208 | Matrix4x4 roty = RotationYMatrix(pitch);
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| 209 | Matrix4x4 rotx = RotationXMatrix(yaw);
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| 210 |
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| 211 | sunPos *= roty;
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| 212 | sunPos *= rotx;;
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| 213 |
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| 214 | //sunposition.rotateAroundY(-D().getScene().getLight().getHorizontalOrientation() + 90.0f);
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| 215 | //sunposition.rotateAroundX(-D().getScene().getLight().getVerticalOrientation());
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| 216 |
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| 217 | glMatrixMode(GL_MODELVIEW);
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| 218 | glMultMatrixf((float *)sunPos.x);
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| 219 |
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| 220 | float ambient[] = {1.0f, 1.0f, 1.0f, 1.0f};
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| 221 |
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| 222 | glMaterialfv(GL_FRONT, GL_AMBIENT, ambient);
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| 223 |
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| 224 | //Float size = 0.5f + (1.0f - lightdirection.y) * 0.5f;
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| 225 |
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| 226 | //mSunEffect->setVariableVector3("LightDiffuseColor", D().getScene().getLight().getDiffuseColor());
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| 227 | //mSunEffect->setVariableFloat("SunSize", size);
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| 228 | //mSunEffect->setVariableTexture2D("SunTexture", mSunTexture);
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| 229 |
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| 230 | /*mSunEffect->activate();
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| 231 |
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| 232 | mSunQuad->render();
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| 233 |
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| 234 | mSunEffect->deactivate();
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| 235 | F().getRenderDevice().setDefaultBlendingMode(FRenderDevice::BLENDING_NONE);*/
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| 236 |
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| 237 | glPopMatrix();
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| 238 | }
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| 239 |
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| 240 |
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| 241 | void SkyPreetham::CreateSunQuad()
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| 242 | {
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| 243 | /*
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| 244 | mSunQuad = new FVertexBuffer();
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| 245 | mSunQuad->setupPrimitiveType(FVertexBuffer::PRIMITIVES_TRIANGLES);
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| 246 | mSunQuad->setupVertexFormat(3, 0, 0, true);
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| 247 | mSunQuad->setupTexCoordSet(0, 2);
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| 248 | mSunQuad->setVertexBufferSize(4, 6);
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| 249 |
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| 250 | mSunQuad->setVertexPosition(0, FVector3(-0.1f, 0.1f, 1.0f));
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| 251 | mSunQuad->setVertexPosition(1, FVector3( 0.1f, 0.1f, 1.0f));
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| 252 | mSunQuad->setVertexPosition(2, FVector3(-0.1f, -0.1f, 1.0f));
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| 253 | mSunQuad->setVertexPosition(3, FVector3( 0.1f, -0.1f, 1.0f));
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| 254 | mSunQuad->setVertexTexCoord(0, 0, FVector2(0.0f, 0.0f));
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| 255 | mSunQuad->setVertexTexCoord(1, 0, FVector2(1.0f, 0.0f));
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| 256 | mSunQuad->setVertexTexCoord(2, 0, FVector2(0.0f, 1.0f));
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| 257 | mSunQuad->setVertexTexCoord(3, 0, FVector2(1.0f, 1.0f));
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| 258 |
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| 259 | mSunQuad->setIndex(0, 0);
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| 260 | mSunQuad->setIndex(1, 1);
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| 261 | mSunQuad->setIndex(2, 2);
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| 262 | mSunQuad->setIndex(3, 2);
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| 263 | mSunQuad->setIndex(4, 1);
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| 264 | mSunQuad->setIndex(5, 3);
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| 265 | */
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| 266 | }
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| 267 |
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| 268 |
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| 269 | void SkyPreetham::ComputeFactors(const Vector3 &sunDir,
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| 270 | Vector3 &zenithColor,
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| 271 | vector<Vector3> &ABCDE,
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| 272 | std::pair<float, float> &sunThetha) const
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| 273 | {
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| 274 | sunThetha.first = acos(sunDir.z);
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| 275 |
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| 276 | const float cos_theta = cos(sunThetha.first);
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| 277 | sunThetha.second = cos_theta * cos_theta;
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| 278 |
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| 279 | zenithColor.x = ( 0.00165f * CBQ(sunThetha.first) - 0.00374f * SQR(sunThetha.first) + 0.00208f * sunThetha.first + 0.0f) * SQR(mTurbidity) +
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| 280 | (-0.02902f * CBQ(sunThetha.first) + 0.06377f * SQR(sunThetha.first) - 0.03202f * sunThetha.first + 0.00394f) * mTurbidity +
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| 281 | ( 0.11693f * CBQ(sunThetha.first) - 0.21196f * SQR(sunThetha.first) + 0.06052f * sunThetha.first + 0.25885f);
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| 282 |
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| 283 | zenithColor.y = ( 0.00275f * CBQ(sunThetha.first) - 0.00610f * SQR(sunThetha.first) + 0.00316f * sunThetha.first + 0.0f) * SQR(mTurbidity) +
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| 284 | (-0.04214f * CBQ(sunThetha.first) + 0.08970f * SQR(sunThetha.first) - 0.04153f * sunThetha.first + 0.00515f) * mTurbidity +
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| 285 | ( 0.15346f * CBQ(sunThetha.first) - 0.26756f * SQR(sunThetha.first) + 0.06669f * sunThetha.first + 0.26688f);
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| 286 |
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| 287 | zenithColor.z = (float)((4.0453f * mTurbidity - 4.9710f) * tan((4.0f / 9.0f - mTurbidity / 120.0f) *
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| 288 | (M_PI - 2.0f * sunThetha.first)) - 0.2155f * mTurbidity + 2.4192f);
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| 289 |
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| 290 | // convert kcd/m² to cd/m²
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| 291 | zenithColor.z *= 1000.0f;
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| 292 |
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| 293 | ABCDE.push_back(Vector3(-0.01925 * mTurbidity - 0.25922, -0.01669 * mTurbidity - 0.26078, 0.17872 * mTurbidity - 1.46303));
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| 294 | ABCDE.push_back(Vector3(-0.06651 * mTurbidity + 0.00081, -0.09495 * mTurbidity + 0.00921, -0.35540 * mTurbidity + 0.42749));
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| 295 | ABCDE.push_back(Vector3(-0.00041 * mTurbidity + 0.21247, -0.00792 * mTurbidity + 0.21023, -0.02266 * mTurbidity + 5.32505));
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| 296 | ABCDE.push_back(Vector3(-0.06409 * mTurbidity - 0.89887, -0.04405 * mTurbidity - 1.65369, 0.12064 * mTurbidity - 2.57705));
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| 297 | ABCDE.push_back(Vector3(-0.00325 * mTurbidity + 0.04517, -0.01092 * mTurbidity + 0.05291, -0.06696 * mTurbidity + 0.37027));
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| 298 | }
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| 299 |
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| 300 |
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| 301 | void SkyPreetham::ComputeSunColor(const Vector3 &sunDir,
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| 302 | Vector3 &ambient,
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| 303 | Vector3 &diffuse,
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| 304 | bool scaleToRange) const
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| 305 | {
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| 306 | // sunDir is sun direction
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| 307 | // ambient color: shadow color
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| 308 | // diffuse color: sun color
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| 309 | pair<float, float> sun_theta;
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| 310 | Vector3 zenithColor;
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| 311 | vector<Vector3> ABCDE;
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| 312 |
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| 313 | ComputeFactors(sunDir, zenithColor, ABCDE, sun_theta);
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| 314 |
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| 315 | Vector3 zenith_XYZ;
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| 316 |
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| 317 | zenith_XYZ.x = (zenithColor.x / zenithColor.y) * zenithColor.z;
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| 318 | zenith_XYZ.y = zenithColor.z;
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| 319 | zenith_XYZ.z = ((1.0f - zenithColor.x - zenithColor.y) / zenithColor.y) * zenithColor.z;
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| 320 |
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| 321 | ambient.x = 3.240479f * zenith_XYZ.x - 1.537150f * zenith_XYZ.y - 0.498535f * zenith_XYZ.z;
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| 322 | ambient.y = -0.969256f * zenith_XYZ.x + 1.875992f * zenith_XYZ.y + 0.041556f * zenith_XYZ.z;
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| 323 | ambient.z = 0.055648f * zenith_XYZ.x - 0.204043f * zenith_XYZ.y + 1.057311f * zenith_XYZ.z;
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| 324 |
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| 325 | // downscale ambient color
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| 326 | if (scaleToRange)
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| 327 | ambient *= 2e-5f;
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| 328 | else
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| 329 | ambient *= 1e-1f;
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| 330 |
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| 331 | // simulate the sun intensity by modulating the ambient term.
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| 332 | ambient *= (10.0f - 9.0f * DotProd(sunDir, Vector3::UNIT_Z()));
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| 333 | //ambient += Vector3(0.2f);
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| 334 |
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| 335 | Vector3 num;
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| 336 |
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| 337 | num.x = (1.0f + ABCDE[0].x * exp(ABCDE[1].x / sunDir.z)) * (1.0f + ABCDE[2].x)+ ABCDE[4].x;
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| 338 | num.y = (1.0f + ABCDE[0].y * exp(ABCDE[1].y / sunDir.z)) * (1.0f + ABCDE[2].y)+ ABCDE[4].y;
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| 339 | num.z = (1.0f + ABCDE[0].z * exp(ABCDE[1].z / sunDir.z)) * (1.0f + ABCDE[2].z)+ ABCDE[4].z;
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| 340 |
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| 341 | Vector3 den;
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| 342 |
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| 343 | den.x = (1.0f + ABCDE[0].x * exp(ABCDE[1].x)) * (1.0f + ABCDE[2].x * exp(ABCDE[3].x * sun_theta.first) + ABCDE[4].x * sun_theta.second);
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| 344 | den.y = (1.0f + ABCDE[0].y * exp(ABCDE[1].y)) * (1.0f + ABCDE[2].y * exp(ABCDE[3].y * sun_theta.first) + ABCDE[4].y * sun_theta.second);
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| 345 | den.z = (1.0f + ABCDE[0].z * exp(ABCDE[1].z)) * (1.0f + ABCDE[2].z * exp(ABCDE[3].z * sun_theta.first) + ABCDE[4].z * sun_theta.second);
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| 346 |
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| 347 |
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| 348 | Vector3 xyY = zenithColor * num / den;
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| 349 |
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| 350 | Vector3 XYZ;
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| 351 |
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| 352 | XYZ.x = (xyY.x / xyY.y) * xyY.z;
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| 353 | XYZ.y = xyY.z;
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| 354 | XYZ.z = ((1.0f - xyY.x - xyY.y) / xyY.y) * xyY.z;
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| 355 |
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| 356 |
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| 357 | /////////////
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| 358 | //-- transform to rgb
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| 359 |
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| 360 | Vector3 color;
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| 361 | color.x = 3.240479f * XYZ.x - 1.537150f * XYZ.y - 0.498535f * XYZ.z;
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| 362 | color.y = -0.969256f * XYZ.x + 1.875992f * XYZ.y + 0.041556f *XYZ.z;
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| 363 | color.z = 0.055648f * XYZ.x - 0.204043f * XYZ.y + 1.057311f * XYZ.z;
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| 364 |
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| 365 | // Calculate final sun diffuse color.
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| 366 | if (scaleToRange)
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| 367 | diffuse = color * 5e-2f;
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| 368 | else
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| 369 | diffuse = color * 3e-1f;
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| 370 |
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| 371 | // diffuse component should be more saturated (and less blueish) for high sun positions
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| 372 | diffuse.x *= 1.3f;
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| 373 | diffuse.z *= 0.7f;
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| 374 |
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| 375 | // scale diffuse component in order to make sky look less bright in relation to
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| 376 | // the geometry in the evening
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| 377 | diffuse *= (2.0f - 1.0f * DotProd(sunDir, Vector3::UNIT_Z()));
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| 378 |
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| 379 | //cout << "diffuse: " << Magnitude(diffuse) << " ambient: " << Magnitude(ambient) << endl;
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| 380 | } |
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