// pbr: create an irradiance cubemap.
private Texture LoadIrradianceMap()
{
var dataProvider = new CubemapDataProvider(null, null, null, null, null, null);
var storage = new CubemapTexImage2D(GL.GL_RGB16F, 32, 32, GL.GL_RGB, GL.GL_FLOAT, dataProvider);
var envCubeMap = new Texture(storage,
new TexParameteri(TexParameter.PropertyName.TextureWrapS, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapT, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapR, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureMinFilter, (int)GL.GL_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureMagFilter, (int)GL.GL_LINEAR));
envCubeMap.Initialize();
return(envCubeMap);
}
private Texture LoadPrefliterMap()
{
var dataProvider = new CubemapDataProvider(null, null, null, null, null, null);
var storage = new CubemapTexImage2D(GL.GL_RGB16F, 128, 128, GL.GL_RGB, GL.GL_FLOAT, dataProvider, 6);
var prefliterMap = new Texture(storage, new MipmapBuilder(),
new TexParameteri(TexParameter.PropertyName.TextureWrapS, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapT, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapR, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureMinFilter, (int)GL.GL_LINEAR_MIPMAP_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureMagFilter, (int)GL.GL_LINEAR));
prefliterMap.Initialize();
return(prefliterMap);
}
private Texture GetCubemapTexture(Bitmap totalBmp)
{
var dataProvider = GetCubemapDataProvider(totalBmp);
TexStorageBase storage = new CubemapTexImage2D(GL.GL_RGBA, totalBmp.Width / 4, totalBmp.Height / 3, GL.GL_BGRA, GL.GL_UNSIGNED_BYTE, dataProvider);
var texture = new Texture(storage,
new TexParameteri(TexParameter.PropertyName.TextureMagFilter, (int)GL.GL_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureMinFilter, (int)GL.GL_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureWrapS, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapT, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapR, (int)GL.GL_CLAMP_TO_EDGE));
texture.Initialize();
return(texture);
}
// pbr: setup cubemap to render to and attach to framebuffer
private Texture LoadEnvCubeMap()
{
var dataProvider = new CubemapDataProvider(null, null, null, null, null, null);
var storage = new CubemapTexImage2D(GL.GL_RGB16F, 512, 512, GL.GL_RGB, GL.GL_FLOAT, dataProvider);
var envCubeMap = new Texture(storage,
new MipmapBuilder(), // This is can also be done inside CubemapNode.DoInitialize().
new TexParameteri(TexParameter.PropertyName.TextureWrapS, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapT, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapR, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureMinFilter, (int)GL.GL_LINEAR_MIPMAP_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureMagFilter, (int)GL.GL_LINEAR));
envCubeMap.Initialize();
return(envCubeMap);
}
private Texture GetCubemapTexture(Bitmap[] bitmaps)
{
var dataProvider = new CubemapDataProvider(
bitmaps[0], bitmaps[1], bitmaps[2], bitmaps[3], bitmaps[4], bitmaps[5]);
var storage = new CubemapTexImage2D((int)GL.GL_RGBA, bitmaps[0].Width, bitmaps[0].Height, 0, GL.GL_BGRA, GL.GL_UNSIGNED_BYTE, dataProvider);
var texture = new Texture(TextureTarget.TextureCubeMap, storage,
new TexParameteri(TexParameter.PropertyName.TextureMagFilter, (int)GL.GL_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureMinFilter, (int)GL.GL_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureWrapS, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapT, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapR, (int)GL.GL_CLAMP_TO_EDGE));
texture.Initialize();
return(texture);
}
// pbr: create a pre-filter cubemap.
private Texture LoadPrefilterMap()
{
var dataProvider = new CubemapDataProvider(null, null, null, null, null, null);
var storage = new CubemapTexImage2D(GL.GL_RGB16F, 128, 128, GL.GL_RGB, GL.GL_FLOAT, dataProvider);
var envCubeMap = new Texture(storage,
// generate mipmaps for the cubemap so OpenGL automatically allocates the required memory.
new MipmapBuilder(),
new TexParameteri(TexParameter.PropertyName.TextureWrapS, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapT, (int)GL.GL_CLAMP_TO_EDGE),
new TexParameteri(TexParameter.PropertyName.TextureWrapR, (int)GL.GL_CLAMP_TO_EDGE),
// be sure to set minifcation filter to mip_linear
new TexParameteri(TexParameter.PropertyName.TextureMinFilter, (int)GL.GL_LINEAR_MIPMAP_LINEAR),
new TexParameteri(TexParameter.PropertyName.TextureMagFilter, (int)GL.GL_LINEAR));
envCubeMap.Initialize();
return(envCubeMap);
}