Hello,
I have been trying to make a simple pixelation shader but it doesn’t seem to work with the opengl template.
I was using the directX template and it worked pretty well.
The problem is with this bit of code:
float2 coord = round(i.txc * amount) / amount;
float4 tex = tex2D(TextureSampler, coord);
When I do the calculations on the coords I get nothing… almost… when I move forward the screen color changes to green… because I have a green sphere I guess.
but when I do this:
float4 tex = tex2D(TextureSampler, i.txc);
Everything is back to normal… without the pixelation effect… so this is not a solution.
Here is the full shader code:
#if OPENGL
#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
float amount = 400.0;
float spread = 0.08;
float redcount = 12;
float greencount = 12;
float bluecount = 12;
int bayer4[4 * 4] =
{
0, 8, 2, 10,
12, 4, 14, 6,
3, 11, 1, 9,
15, 7, 13, 5
};
float GetBayer4(int x, int y)
{
return float(bayer4[(x % 4) + (y % 4) * 4]) * (1.0f / 16.0f) - 0.5f;
}
texture ScreenTexture;
sampler2D TextureSampler : register(s0)
{
Texture = (ScreenTexture);
};
struct VertexShaderOutput
{
float4 pos : PS_POSITION;
float2 txc : TEXCOORD0;
};
float4 MainPS(VertexShaderOutput i) : COLOR
{
float2 coord = round(i.txc * amount) / amount;
float4 tex = tex2D(TextureSampler, coord);
float coordx = i.txc.x * 0.6;
float coordy = i.txc.y * 0.6;
int x = int(coordx * 1280);
int y = int(coordy * 880);
//float4 final = tex;
float4 final = tex + spread * GetBayer4(x, y);
final.x = floor((redcount - 1.0) * final.r + 0.5) / (redcount - 1.0);
final.y = floor((greencount - 1.0) * final.g + 0.5) / (greencount - 1.0);
final.z = floor((bluecount - 1.0) * final.b + 0.5) / (bluecount - 1.0);
return final;
}
technique BasicColorDrawing
{
pass P0
{
PixelShader = compile PS_SHADERMODEL MainPS();
}
}
