Need help transforming DirectX 9 skybox hlsl shader to DirectX 11
- by J2V
I am in the middle of implementing a skybox to my game. I have been following this tutorial http://rbwhitaker.wikidot.com/skyboxes-2. I am using MonoGame as a framework and in order to support both Windows and Windows 8 metro I need to compile the shader with pixel and vertex shader 4.
compile vs_4_0_level_9_1
compile ps_4_0_level_9_1
However some of the hlsl syntax has been updated with DX10 and DX11.
I need to update this hlsl code:
float4x4 World;
float4x4 View;
float4x4 Projection;
float3 CameraPosition;
Texture SkyBoxTexture;
samplerCUBE SkyBoxSampler = sampler_state
{
texture = <SkyBoxTexture>;
magfilter = LINEAR;
minfilter = LINEAR;
mipfilter = LINEAR;
AddressU = Mirror;
AddressV = Mirror;
};
struct VertexShaderInput
{
float4 Position : POSITION0;
};
struct VertexShaderOutput
{
float4 Position : POSITION0;
float3 TextureCoordinate : TEXCOORD0;
};
VertexShaderOutput VertexShaderFunction(VertexShaderInput input)
{
VertexShaderOutput output;
float4 worldPosition = mul(input.Position, World);
float4 viewPosition = mul(worldPosition, View);
output.Position = mul(viewPosition, Projection);
float4 VertexPosition = mul(input.Position, World);
output.TextureCoordinate = VertexPosition - CameraPosition;
return output;
}
float4 PixelShaderFunction(VertexShaderOutput input) : COLOR0
{
return texCUBE(SkyBoxSampler, normalize(input.TextureCoordinate));
}
technique Skybox
{
pass Pass1
{
VertexShader = compile vs_2_0 VertexShaderFunction();
PixelShader = compile ps_2_0 PixelShaderFunction();
}
}
I quess I need to change Texture into TextureCube, change sampler, swap texCUBE() with TextureCube.Sample() and change PixelShader return semantic to SV_Target0.
I'm very new in shader languages and any help is appreciated!
