public static void CreateLightmapTexture(GLContext control, AglLightMap aglLightMap,
EnvironmentGraphics environmentSettings, string name, GLTextureCube output)
{
var lightMapEnv = aglLightMap.LightAreas.FirstOrDefault(x => x.Settings.Name == name);
if (lightMapEnv == null)
{
return;
}
//Force generate mipmaps to update the mip allocation so mips can be assigned.
output.Bind();
GL.GenerateMipmap(GenerateMipmapTarget.TextureCubeMap);
GL.BindTexture(TextureTarget.TextureCubeMap, 0);
GL.Enable(EnableCap.TextureCubeMapSeamless);
if (FilterLevel0 == null)
{
Init(output.Width);
}
int CUBE_SIZE = output.Width;
FilterLevel0.Bind();
LoadCubemapLevel(control, CUBE_SIZE, 0, aglLightMap, environmentSettings, lightMapEnv, output.ID);
FilterLevel0.Unbind();
FilterLevel1.Bind();
LoadCubemapLevel(control, CUBE_SIZE / 2, 1, aglLightMap, environmentSettings, lightMapEnv, output.ID);
FilterLevel1.Unbind();
output.SaveDDS($"LIGHTMAP{name}.dds");
}
static void LoadCubemapLevel(GLContext control, int size, int level, AglLightMap aglLightMap,
EnvironmentGraphics environmentSettings, AglLightMap.LightArea lightMapEnv, int ID)
{
GL.Viewport(0, 0, size, size);
var shader = GlobalShaders.GetShader("LIGHTMAP");
shader.Enable();
UpdateUniforms(control, shader, level, aglLightMap, environmentSettings, lightMapEnv);
for (int i = 0; i < 6; i++)
{
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer,
FramebufferAttachment.ColorAttachment0 + i,
TextureTarget.TextureCubeMapPositiveX + i, ID, level);
}
GL.ClearColor(0, 0, 0, 0);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
ScreenQuadRender.Draw();
var errorcheck = GL.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
if (errorcheck != FramebufferErrorCode.FramebufferComplete)
{
throw new Exception(errorcheck.ToString());
}
GL.UseProgram(0);
}
static void UpdateUniforms(GLContext control, ShaderProgram shader, int mipLevel,
AglLightMap aglLightMap, EnvironmentGraphics environmentSettings, AglLightMap.LightArea lightMapEnv)
{
if (aglLightMap.TextureLUT == null)
{
aglLightMap.Setup();
}
GL.ActiveTexture(TextureUnit.Texture0 + 1);
NormalsTexture.Bind();
shader.SetInt("uNormalTex", 1);
GL.ActiveTexture(TextureUnit.Texture0 + 2);
aglLightMap.TextureLUT.Bind();
shader.SetInt("uLutTex", 2);
var settings = lightMapEnv.Settings;
shader.SetFloat($"settings.rim_angle", settings.rim_angle);
shader.SetFloat($"settings.rim_width", settings.rim_width);
shader.SetInt($"settings.type", settings.lighting_hint);
for (int i = 0; i < 6; i++)
{
shader.SetVector3($"lights[{i}].dir", new Vector3(0));
shader.SetVector4($"lights[{i}].lowerColor", new Vector4(0));
shader.SetVector4($"lights[{i}].upperColor", new Vector4(0));
shader.SetInt($"lights[{i}].lutIndex", 0);
}
int index = 0;
//Loop through the light sources and apply them from the env settings
foreach (var light in lightMapEnv.Lights)
{
//If the name is empty, skip as there is no way to find it.
if (string.IsNullOrEmpty(light.Name))
{
continue;
}
//Skip mip levels for specific light sources
if (!light.enable_mip0 && mipLevel == 0 || !light.enable_mip1 && mipLevel == 1)
{
continue;
}
LightSource lightSource = null;
switch (light.Type)
{
case "DirectionalLight":
var dir = environmentSettings.DirectionalLights.FirstOrDefault(x => x.Name == light.Name);
if (dir != null && dir.Enable)
{
lightSource = LoadDirectionalLighting(dir);
}
break;
case "HemisphereLight":
var hemi = environmentSettings.HemisphereLights.FirstOrDefault(x => x.Name == light.Name);
if (hemi != null && hemi.Enable)
{
lightSource = LoadHemiLighting(hemi);
}
break;
case "AmbientLight":
var ambient = environmentSettings.AmbientLights.FirstOrDefault(x => x.Name == light.Name);
if (ambient != null && ambient.Enable)
{
lightSource = LoadAmbientLighting(ambient);
}
break;
}
if (lightSource == null)
{
continue;
}
//Setup shared settings
lightSource.LutIndex = aglLightMap.GetLUTIndex(light.LutName);
int programID = shader.program;
shader.SetVector3($"lights[{index}].dir", lightSource.Direction);
shader.SetVector4($"lights[{index}].lowerColor", lightSource.LowerColor);
shader.SetVector4($"lights[{index}].upperColor", lightSource.UpperColor);
shader.SetInt($"lights[{index}].lutIndex", lightSource.LutIndex);
index++;
}
lightMapEnv.Initialized = true;
}
