This is my shader. It’s supposed to draw an image that uses its red channel to correspond with the index of the color in the palette.
#define SV_POSITION POSITION
#define VS_SHADERMODEL vs_3_0
#define PS_SHADERMODEL ps_3_0
#else
#define VS_SHADERMODEL vs_4_0_level_9_1
#define PS_SHADERMODEL ps_4_0_level_9_1
#endif
#define PaletteSize 32
Texture2D SpriteTexture;
float4 Palette[PaletteSize];
sampler2D SpriteTextureSampler = sampler_state
{
Texture = <SpriteTexture>;
};
struct VertexShaderOutput
{
float4 Position : SV_POSITION;
float4 Color : COLOR0;
float2 TextureCoordinates : TEXCOORD0;
};
float4 NormalDraw(VertexShaderOutput input) : COLOR
{
return tex2D(SpriteTextureSampler,input.TextureCoordinates) * input.Color;
}
float4 DrawWithPalette(VertexShaderOutput input) : COLOR
{
float4 texcolor = tex2D(SpriteTextureSampler,input.TextureCoordinates);
int index = clamp(texcolor.r * PaletteSize, 0, PaletteSize);
return Palette[index] * texcolor.a;
}
technique NormalSpriteDrawing
{
pass P0
{
PixelShader = compile PS_SHADERMODEL NormalDraw();
}
};
technique PalettedSpriteDrawing
{
pass P0
{
PixelShader = compile PS_SHADERMODEL DrawWithPalette();
}
};
This draws it as a pure white image, shown here https://cdn.discordapp.com/attachments/121565307515961346/372643580105195522/unknown.png
The code I’m doing to set it up…
--- GameplayScreen tells everything to draw
spritebatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend, SamplerState.PointClamp, DepthStencilState.Default, RasterizerState.CullNone, _fx, _camera.GetMatrix());
--- The entity that's drawing it.
public virtual void Draw(SpriteBatch spritebatch, Effect effect)
{
effect.CurrentTechnique = effect.Techniques["PalettedSpriteDrawing"];
SetPalette(effect);
effect.CurrentTechnique.Passes[0].Apply();
//Draw underside cannons
foreach (var gun in MainGuns)
{
gun.Draw(spritebatch, effect);
}
foreach (var gun in SubGuns)
{
gun.Draw(spritebatch, effect);
}
foreach (var launcher in MissileLaunchers)
{
launcher.Draw(spritebatch, effect);
}
//Draw thrusters
DrawThrusters(spritebatch, effect);
//Draw main body
TextureInfo.Draw(spritebatch, Transform.Position, Transform.Rotation, Origin, Vector2.One);
//Draw mounted heavy weapon
foreach (var heavy in MountedHeavyWeapons)
{
heavy.Draw(spritebatch, effect);
}
effect.CurrentTechnique = effect.Techniques["NormalSpriteDrawing"];
effect.CurrentTechnique.Passes[0].Apply();
}
There is no other code other than this that effects spritebatch or the effect. Am I using the effect wrong? Is there a problem with the shader? It’s displaying as all white and my palette of 32 colors has no white in it at all. I think I’ve provided all the information I can. Thank you for your help.
