private void ApplySlippage()
{
for (int i = 0; i < TERRAIN_LAYERS; i++)
{
if (m_talusAngle[i] < 90.0f)
{
float talusAngle = (Mathf.PI * m_talusAngle[i]) / 180.0f;
float maxHeightDif = Mathf.Tan(talusAngle) * CELL_LENGTH;
m_slippageHeightMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_slippageHeightMat.SetFloat("_Layers", (float)(i + 1));
m_slippageHeightMat.SetFloat("_MaxHeightDif", maxHeightDif);
m_slippageHeightMat.SetTexture("_TerrainField", m_terrainField[READ]);
Graphics.Blit(null, m_slippageHeight, m_slippageHeightMat);
m_slippageOutflowMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_slippageOutflowMat.SetFloat("_Layers", (float)(i + 1));
m_slippageOutflowMat.SetFloat("T", TIME_STEP);
m_slippageOutflowMat.SetTexture("_MaxSlippageHeights", m_slippageHeight);
m_slippageOutflowMat.SetTexture("_TerrainField", m_terrainField[READ]);
Graphics.Blit(null, m_slippageOutflow, m_slippageOutflowMat);
m_slippageUpdateMat.SetFloat("T", TIME_STEP);
m_slippageUpdateMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_slippageUpdateMat.SetFloat("_Layers", (float)(i + 1));
m_slippageUpdateMat.SetTexture("_SlippageOutflow", m_slippageOutflow);
Graphics.Blit(m_terrainField[READ], m_terrainField[WRITE], m_slippageUpdateMat);
RTUtility.Swap(m_terrainField);
}
}
}
private void ErosionAndDeposition()
{
m_tiltAngleMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_tiltAngleMat.SetFloat("_Layers", TERRAIN_LAYERS);
m_tiltAngleMat.SetTexture("_TerrainField", m_terrainField[READ]);
Graphics.Blit(null, m_tiltAngle, m_tiltAngleMat);
m_erosionAndDepositionMat.SetTexture("_TerrainField", m_terrainField[READ]);
m_erosionAndDepositionMat.SetTexture("_SedimentField", m_sedimentField[READ]);
m_erosionAndDepositionMat.SetTexture("_VelocityField", m_waterVelocity[READ]);
m_erosionAndDepositionMat.SetTexture("_TiltAngle", m_tiltAngle);
m_erosionAndDepositionMat.SetFloat("_MinTiltAngle", m_minTiltAngle);
m_erosionAndDepositionMat.SetFloat("_SedimentCapacity", m_sedimentCapacity);
m_erosionAndDepositionMat.SetVector("_DissolvingConstant", m_dissolvingConstant);
m_erosionAndDepositionMat.SetFloat("_DepositionConstant", m_depositionConstant);
m_erosionAndDepositionMat.SetFloat("_Layers", (float)TERRAIN_LAYERS);
RenderTexture[] terrainAndSediment = new RenderTexture[2] {
m_terrainField[WRITE], m_sedimentField[WRITE]
};
RTUtility.MultiTargetBlit(terrainAndSediment, m_erosionAndDepositionMat);
RTUtility.Swap(m_terrainField);
RTUtility.Swap(m_sedimentField);
}
private void ApplyFreeSlip(RenderTexture[] field)
{
float u = 1.0f / (float)TEX_SIZE;
Vector2 offset;
Graphics.Blit(field[READ], field[WRITE]);
offset = new Vector2(u, 0.0f);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectLeft, 0, false);
offset = new Vector2(0.0f, u);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectBottom, 0, false);
offset = new Vector2(-u, 0.0f);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectRight, 0, false);
offset = new Vector2(0.0f, -u);
m_applyFreeSlipMat.SetVector("_Offset", offset);
RTUtility.Blit(field[READ], field[WRITE], m_applyFreeSlipMat, m_rectTop, 0, false);
RTUtility.Swap(field);
}
private void DisintegrateAndDeposit()
{
m_disintegrateAndDepositMat.SetFloat("_Layers", (float)TERRAIN_LAYERS);
m_disintegrateAndDepositMat.SetTexture("_TerrainField", m_terrainField[READ]);
m_disintegrateAndDepositMat.SetTexture("_WaterField", m_waterField[READ]);
m_disintegrateAndDepositMat.SetTexture("_RegolithField", m_regolithField[READ]);
m_disintegrateAndDepositMat.SetFloat("_MaxRegolith", m_maxRegolith);
RenderTexture[] terrainAndRegolith = new RenderTexture[2] {
m_terrainField[WRITE], m_regolithField[WRITE]
};
RTUtility.MultiTargetBlit(terrainAndRegolith, m_disintegrateAndDepositMat);
RTUtility.Swap(m_terrainField);
RTUtility.Swap(m_regolithField);
}
private void AdvectSediment()
{
m_advectSedimentMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_advectSedimentMat.SetFloat("T", TIME_STEP);
m_advectSedimentMat.SetFloat("_VelocityFactor", 1.0f);
m_advectSedimentMat.SetTexture("_VelocityField", m_waterVelocity[READ]);
Graphics.Blit(m_sedimentField[READ], m_advectSediment[0], m_advectSedimentMat);
m_advectSedimentMat.SetFloat("_VelocityFactor", -1.0f);
Graphics.Blit(m_advectSediment[0], m_advectSediment[1], m_advectSedimentMat);
m_processMacCormackMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_processMacCormackMat.SetFloat("T", TIME_STEP);
m_processMacCormackMat.SetTexture("_VelocityField", m_waterVelocity[READ]);
m_processMacCormackMat.SetTexture("_InterField1", m_advectSediment[0]);
m_processMacCormackMat.SetTexture("_InterField2", m_advectSediment[1]);
Graphics.Blit(m_sedimentField[READ], m_sedimentField[WRITE], m_processMacCormackMat);
RTUtility.Swap(m_sedimentField);
}
private void WaterInput()
{
if (Input.GetKey(KeyCode.DownArrow))
{
m_waterInputPoint.y -= m_waterInputSpeed * Time.deltaTime;
}
if (Input.GetKey(KeyCode.UpArrow))
{
m_waterInputPoint.y += m_waterInputSpeed * Time.deltaTime;
}
if (Input.GetKey(KeyCode.LeftArrow))
{
m_waterInputPoint.x -= m_waterInputSpeed * Time.deltaTime;
}
if (Input.GetKey(KeyCode.RightArrow))
{
m_waterInputPoint.x += m_waterInputSpeed * Time.deltaTime;
}
if (m_waterInputAmount > 0.0f)
{
m_waterInputMat.SetVector("_Point", m_waterInputPoint);
m_waterInputMat.SetFloat("_Radius", m_waterInputRadius);
m_waterInputMat.SetFloat("_Amount", m_waterInputAmount);
Graphics.Blit(m_waterField[READ], m_waterField[WRITE], m_waterInputMat);
RTUtility.Swap(m_waterField);
}
if (m_evaporationConstant > 0.0f)
{
m_evaprationMat.SetFloat("_EvaporationConstant", m_evaporationConstant);
Graphics.Blit(m_waterField[READ], m_waterField[WRITE], m_evaprationMat);
RTUtility.Swap(m_waterField);
}
}
private void WaterVelocity()
{
m_waterVelocityMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_waterVelocityMat.SetFloat("L", CELL_LENGTH);
m_waterVelocityMat.SetTexture("_WaterField", m_waterField[READ]);
m_waterVelocityMat.SetTexture("_WaterFieldOld", m_waterField[WRITE]);
m_waterVelocityMat.SetTexture("_OutFlowField", m_waterOutFlow[READ]);
Graphics.Blit(null, m_waterVelocity[READ], m_waterVelocityMat);
const float viscosity = 10.5f;
const int iterations = 2;
m_diffuseVelocityMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_diffuseVelocityMat.SetFloat("_Alpha", CELL_AREA / (viscosity * TIME_STEP));
for (int i = 0; i < iterations; i++)
{
Graphics.Blit(m_waterVelocity[READ], m_waterVelocity[WRITE], m_diffuseVelocityMat);
RTUtility.Swap(m_waterVelocity);
}
}
private void OutFlow(RenderTexture[] field, RenderTexture[] outFlow, float damping)
{
m_outFlowMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_outFlowMat.SetFloat("T", TIME_STEP);
m_outFlowMat.SetFloat("L", PIPE_LENGTH);
m_outFlowMat.SetFloat("A", CELL_AREA);
m_outFlowMat.SetFloat("G", GRAVITY);
m_outFlowMat.SetFloat("_Layers", TERRAIN_LAYERS);
m_outFlowMat.SetFloat("_Damping", 1.0f - damping);
m_outFlowMat.SetTexture("_TerrainField", m_terrainField[READ]);
m_outFlowMat.SetTexture("_Field", field[READ]);
Graphics.Blit(outFlow[READ], outFlow[WRITE], m_outFlowMat);
RTUtility.Swap(outFlow);
m_fieldUpdateMat.SetFloat("_TexSize", (float)TEX_SIZE);
m_fieldUpdateMat.SetFloat("T", TIME_STEP);
m_fieldUpdateMat.SetFloat("L", PIPE_LENGTH);
m_fieldUpdateMat.SetTexture("_OutFlowField", outFlow[READ]);
Graphics.Blit(field[READ], field[WRITE], m_fieldUpdateMat);
RTUtility.Swap(field);
}
private void InitMaps()
{
RTUtility.ClearColor(m_terrainField);
RTUtility.ClearColor(m_waterOutFlow);
RTUtility.ClearColor(m_waterVelocity);
RTUtility.ClearColor(m_advectSediment);
RTUtility.ClearColor(m_waterField);
RTUtility.ClearColor(m_sedimentField);
RTUtility.ClearColor(m_regolithField);
RTUtility.ClearColor(m_regolithOutFlow);
RenderTexture[] noiseTex = new RenderTexture[2];
noiseTex[0] = new RenderTexture(TEX_SIZE, TEX_SIZE, 0, RenderTextureFormat.RFloat);
noiseTex[0].wrapMode = TextureWrapMode.Clamp;
noiseTex[0].filterMode = FilterMode.Bilinear;
noiseTex[1] = new RenderTexture(TEX_SIZE, TEX_SIZE, 0, RenderTextureFormat.RFloat);
noiseTex[1].wrapMode = TextureWrapMode.Clamp;
noiseTex[1].filterMode = FilterMode.Bilinear;
GPUPerlinNoise perlin = new GPUPerlinNoise(m_seed);
perlin.LoadResourcesFor2DNoise();
m_noiseMat.SetTexture("_PermTable1D", perlin.PermutationTable1D);
m_noiseMat.SetTexture("_Gradient2D", perlin.Gradient2D);
for (int j = 0; j < TERRAIN_LAYERS; j++)
{
m_noiseMat.SetFloat("_Offset", m_offset[j]);
float amp = 0.5f;
float freq = m_frequency[j];
//Must clear noise from last pass
RTUtility.ClearColor(noiseTex);
//write noise into texture with the settings for this layer
for (int i = 0; i < m_octaves[j]; i++)
{
m_noiseMat.SetFloat("_Frequency", freq);
m_noiseMat.SetFloat("_Amp", amp);
m_noiseMat.SetFloat("_Pass", (float)i);
Graphics.Blit(noiseTex[READ], noiseTex[WRITE], m_noiseMat, (int)m_layerStyle[j]);
RTUtility.Swap(noiseTex);
freq *= m_lacunarity[j];
amp *= m_gain[j];
}
float useAbs = 0.0f;
if (m_finalNosieIsAbs[j])
{
useAbs = 1.0f;
}
//Mask the layers that we dont want to write into
Vector4 mask = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
mask[j] = 1.0f;
m_initTerrainMat.SetFloat("_Amp", m_amp[j]);
m_initTerrainMat.SetFloat("_UseAbs", useAbs);
m_initTerrainMat.SetVector("_Mask", mask);
m_initTerrainMat.SetTexture("_NoiseTex", noiseTex[READ]);
m_initTerrainMat.SetFloat("_Height", TERRAIN_HEIGHT);
//Apply the noise for this layer to the terrain field
Graphics.Blit(m_terrainField[READ], m_terrainField[WRITE], m_initTerrainMat);
RTUtility.Swap(m_terrainField);
}
//dont need this tex anymore
noiseTex[0] = null;
noiseTex[1] = null;
}