RenderTexture Render(RenderTexture target)
{
if (target == null)
{
return(null);
}
if (bloom_enabled)
{
ApplyBloom(density_dfbo.GetReadFBO(), bloom_fbo);
}
blendOption = FluidBlendOption.BlendOption.Enable_One_OMSA;
int width = target.width;
int height = target.height;
if (transparent_enable)
{
backgroundProgram.SetFloat("_aspectRatio", (float)width / (float)height);
backgroundProgram.Blit(target, target, blendOption);
}
else
{
colorProgram.SetColor("_color", BACK_COLOR);
colorProgram.Blit(target, target, blendOption);
}
if (shading_enable)
{
FluidProgram program = bloom_enabled ? displayBloomShadingProgram : displayShadingProgram;
program.SetFloat("_texelSize_x", 1.0f / simWidth);
program.SetFloat("_texelSize_y", 1.0f / simHeight);
program.SetTexture("_uTexture", density_dfbo.GetReadFBO());
if (bloom_enabled)
{
program.SetTexture("_Bloom", bloom_fbo);
program.SetTexture("_Dithering", ditheringTexture);
Vector2 scale = GetTextureScale(ditheringTexture, width, height);
program.SetFloat("_ditherScale_x", scale.x);
program.SetFloat("_ditherScale_y", scale.y);
}
program.Blit(target, target, blendOption);
}
else
{
FluidProgram program = bloom_enabled ? displayBloomProgram : displayProgram;
program.SetTexture("_uTexture", density_dfbo.GetReadFBO());
if (bloom_enabled)
{
program.SetTexture("_Bloom", bloom_fbo);
program.SetTexture("_Dithering", ditheringTexture);
Vector2 scale = GetTextureScale(ditheringTexture, width, height);
program.SetFloat("_ditherScale_x", scale.x);
program.SetFloat("_ditherScale_y", scale.y);
}
program.Blit(target, target, blendOption);
}
return(target);
}
void Step(float dt)
{
blendOption = FluidBlendOption.BlendOption.Disable;
curlProgram.SetFloat("_texelSize_x", 1.0f / simWidth);
curlProgram.SetFloat("_texelSize_y", 1.0f / simHeight);
curlProgram.SetTexture("_Velocity", velocity_dfbo.GetReadFBO());
curlProgram.Blit(curl_fbo, curl_fbo, blendOption);
vorticityProgram.SetFloat("_texelSize_x", 1.0f / simWidth);
vorticityProgram.SetFloat("_texelSize_y", 1.0f / simHeight);
vorticityProgram.SetTexture("_Velocity", velocity_dfbo.GetReadFBO());
vorticityProgram.SetTexture("_Curl", curl_fbo);
vorticityProgram.SetFloat("_curl", CURL);
vorticityProgram.SetFloat("_dt", dt);
vorticityProgram.Blit(velocity_dfbo.GetWriteFBO(), velocity_dfbo.GetWriteFBO(), blendOption);
velocity_dfbo.Swap();
divergenceProgram.SetFloat("_texelSize_x", 1.0f / simWidth);
divergenceProgram.SetFloat("_texelSize_y", 1.0f / simHeight);
divergenceProgram.SetTexture("_Velocity", velocity_dfbo.GetReadFBO());
divergenceProgram.Blit(divergence_fbo, divergence_fbo, blendOption);
clearProgram.SetTexture("_uTexture", pressure_dfbo.GetReadFBO());
clearProgram.SetFloat("_value", PRESSURE_DISSIPATION);
clearProgram.Blit(pressure_dfbo.GetWriteFBO(), pressure_dfbo.GetWriteFBO(), blendOption);
pressure_dfbo.Swap();
pressureProgram.SetFloat("_texelSize_x", 1.0f / simWidth);
pressureProgram.SetFloat("_texelSize_y", 1.0f / simHeight);
pressureProgram.SetTexture("_Divergence", divergence_fbo);
for (int i = 0; i < PRESSURE_ITERATIONS; i++)
{
pressureProgram.SetTexture("_Pressure", pressure_dfbo.GetReadFBO());
pressureProgram.Blit(pressure_dfbo.GetWriteFBO(), pressure_dfbo.GetWriteFBO(), blendOption);
pressure_dfbo.Swap();
}
gradienSubtractProgram.SetFloat("_texelSize_x", 1.0f / simWidth);
gradienSubtractProgram.SetFloat("_texelSize_y", 1.0f / simHeight);
gradienSubtractProgram.SetTexture("_Pressure", pressure_dfbo.GetReadFBO());
gradienSubtractProgram.SetTexture("_Velocity", velocity_dfbo.GetReadFBO());
gradienSubtractProgram.Blit(velocity_dfbo.GetWriteFBO(), velocity_dfbo.GetWriteFBO(), blendOption);
velocity_dfbo.Swap();
advectionProgram.SetFloat("_texelSize_x", 1.0f / simWidth);
advectionProgram.SetFloat("_texelSize_y", 1.0f / simHeight);
if (!supportLinearFiltering)
{
advectionProgram.SetFloat("_dyeTexelSize_x", 1.0f / simWidth);
advectionProgram.SetFloat("_dyeTexelSize_y", 1.0f / simHeight);
}
advectionProgram.SetTexture("_Velocity", velocity_dfbo.GetReadFBO());
advectionProgram.SetTexture("_Source", velocity_dfbo.GetReadFBO());
advectionProgram.SetFloat("_dt", dt);
advectionProgram.SetFloat("_dissipation", VELOCITY_DISSIPATION);
advectionProgram.Blit(velocity_dfbo.GetWriteFBO(), velocity_dfbo.GetWriteFBO(), blendOption);
velocity_dfbo.Swap();
if (!supportLinearFiltering)
{
advectionProgram.SetFloat("_dyeTexelSize_x", 1.0f / dyeWidth);
advectionProgram.SetFloat("_dyeTexelSize_y", 1.0f / dyeHeight);
}
advectionProgram.SetTexture("_Velocity", velocity_dfbo.GetReadFBO());
advectionProgram.SetTexture("_Source", density_dfbo.GetReadFBO());
advectionProgram.SetFloat("_dissipation", DENSITY_DISSIPATION);
advectionProgram.Blit(density_dfbo.GetWriteFBO(), density_dfbo.GetWriteFBO(), blendOption);
density_dfbo.Swap();
}