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#include "D3D12_Shader_Common.hlsli"
Texture2D texture0 : register(t0);
Texture2D texture1 : register(t1);
Texture2D texture2 : register(t2);
SamplerState sampler0 : register(s0);
struct PixelShaderInput
{
float4 pos : SV_POSITION;
float2 tex : TEXCOORD0;
float4 color : COLOR0;
};
// These should mirror the definitions in SDL_render_d3d12.c
static const float TONEMAP_NONE = 0;
static const float TONEMAP_LINEAR = 1;
static const float TONEMAP_CHROME = 2;
static const float TEXTURETYPE_NONE = 0;
static const float TEXTURETYPE_RGB = 1;
static const float TEXTURETYPE_NV12 = 2;
static const float TEXTURETYPE_NV21 = 3;
static const float TEXTURETYPE_YUV = 4;
static const float INPUTTYPE_UNSPECIFIED = 0;
static const float INPUTTYPE_SRGB = 1;
static const float INPUTTYPE_SCRGB = 2;
static const float INPUTTYPE_HDR10 = 3;
cbuffer Constants : register(b1)
{
float scRGB_output;
float texture_type;
float input_type;
float color_scale;
float tonemap_method;
float tonemap_factor1;
float tonemap_factor2;
float sdr_white_point;
float4 Yoffset;
float4 Rcoeff;
float4 Gcoeff;
float4 Bcoeff;
};
static const float3x3 mat709to2020 = {
{ 0.627404, 0.329283, 0.043313 },
{ 0.069097, 0.919541, 0.011362 },
{ 0.016391, 0.088013, 0.895595 }
};
static const float3x3 mat2020to709 = {
{ 1.660496, -0.587656, -0.072840 },
{ -0.124547, 1.132895, -0.008348 },
{ -0.018154, -0.100597, 1.118751 }
};
float sRGBtoLinear(float v)
{
if (v <= 0.04045) {
v = (v / 12.92);
} else {
v = pow(abs(v + 0.055) / 1.055, 2.4);
}
return v;
}
float sRGBfromLinear(float v)
{
if (v <= 0.0031308) {
v = (v * 12.92);
} else {
v = (pow(abs(v), 1.0 / 2.4) * 1.055 - 0.055);
}
return v;
}
float3 PQtoLinear(float3 v)
{
const float c1 = 0.8359375;
const float c2 = 18.8515625;
const float c3 = 18.6875;
const float oo_m1 = 1.0 / 0.1593017578125;
const float oo_m2 = 1.0 / 78.84375;
float3 num = max(pow(abs(v), oo_m2) - c1, 0.0);
float3 den = c2 - c3 * pow(abs(v), oo_m2);
return (10000.0 * pow(abs(num / den), oo_m1) / sdr_white_point);
}
float3 ApplyTonemap(float3 v)
{
if (tonemap_method == TONEMAP_LINEAR) {
v *= tonemap_factor1;
} else if (tonemap_method == TONEMAP_CHROME) {
if (input_type == INPUTTYPE_SCRGB) {
// Convert to BT.2020 colorspace for tone mapping
v = mul(mat709to2020, v);
}
float vmax = max(v.r, max(v.g, v.b));
if (vmax > 0.0) {
float scale = (1.0 + tonemap_factor1 * vmax) / (1.0 + tonemap_factor2 * vmax);
v *= scale;
}
if (input_type == INPUTTYPE_SCRGB) {
// Convert to BT.709 colorspace after tone mapping
v = mul(mat2020to709, v);
}
}
return v;
}
float4 GetInputColor(PixelShaderInput input)
{
float4 rgba;
if (texture_type == TEXTURETYPE_NONE) {
rgba = 1.0;
} else if (texture_type == TEXTURETYPE_RGB) {
rgba = texture0.Sample(sampler0, input.tex);
} else if (texture_type == TEXTURETYPE_NV12) {
float3 yuv;
yuv.x = texture0.Sample(sampler0, input.tex).r;
yuv.yz = texture1.Sample(sampler0, input.tex).rg;
yuv += Yoffset.xyz;
rgba.r = dot(yuv, Rcoeff.xyz);
rgba.g = dot(yuv, Gcoeff.xyz);
rgba.b = dot(yuv, Bcoeff.xyz);
rgba.a = 1.0;
} else if (texture_type == TEXTURETYPE_NV21) {
float3 yuv;
yuv.x = texture0.Sample(sampler0, input.tex).r;
yuv.yz = texture1.Sample(sampler0, input.tex).gr;
yuv += Yoffset.xyz;
rgba.r = dot(yuv, Rcoeff.xyz);
rgba.g = dot(yuv, Gcoeff.xyz);
rgba.b = dot(yuv, Bcoeff.xyz);
rgba.a = 1.0;
} else if (texture_type == TEXTURETYPE_YUV) {
float3 yuv;
yuv.x = texture0.Sample(sampler0, input.tex).r;
yuv.y = texture1.Sample(sampler0, input.tex).r;
yuv.z = texture2.Sample(sampler0, input.tex).r;
yuv += Yoffset.xyz;
rgba.r = dot(yuv, Rcoeff.xyz);
rgba.g = dot(yuv, Gcoeff.xyz);
rgba.b = dot(yuv, Bcoeff.xyz);
rgba.a = 1.0;
} else {
// Error!
rgba.r = 1.0;
rgba.g = 0.0;
rgba.b = 0.0;
rgba.a = 1.0;
}
return rgba;
}
float4 GetOutputColor(float4 rgba)
{
float4 output;
output.rgb = rgba.rgb * color_scale;
output.a = rgba.a;
return output;
}
float3 GetOutputColorFromSRGB(float3 rgb)
{
float3 output;
if (scRGB_output) {
rgb.r = sRGBtoLinear(rgb.r);
rgb.g = sRGBtoLinear(rgb.g);
rgb.b = sRGBtoLinear(rgb.b);
}
output.rgb = rgb * color_scale;
return output;
}
float3 GetOutputColorFromLinear(float3 rgb)
{
float3 output;
output.rgb = rgb * color_scale;
if (!scRGB_output) {
output.r = sRGBfromLinear(output.r);
output.g = sRGBfromLinear(output.g);
output.b = sRGBfromLinear(output.b);
output.rgb = saturate(output.rgb);
}
return output;
}
float4 AdvancedPixelShader(PixelShaderInput input)
{
float4 rgba = GetInputColor(input);
float4 output;
if (input_type == INPUTTYPE_HDR10) {
rgba.rgb = PQtoLinear(rgba.rgb);
}
if (tonemap_method != TONEMAP_NONE) {
rgba.rgb = ApplyTonemap(rgba.rgb);
}
if (input_type == INPUTTYPE_SRGB) {
output.rgb = GetOutputColorFromSRGB(rgba.rgb);
output.a = rgba.a;
} else if (input_type == INPUTTYPE_SCRGB) {
output.rgb = GetOutputColorFromLinear(rgba.rgb);
output.a = rgba.a;
} else if (input_type == INPUTTYPE_HDR10) {
rgba.rgb = mul(mat2020to709, rgba.rgb);
output.rgb = GetOutputColorFromLinear(rgba.rgb);
output.a = rgba.a;
} else {
output = GetOutputColor(rgba);
}
return output * input.color;
}
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