improved physics, added better caching

funnyassets/gfx_shaders/agx_comp.slang

@@ -0,0 +1,93 @@
+
+
+[[vk::binding(0)]]
+RWTexture2D<float4> g_imageIn;
+[[vk::binding(1)]]
+RWTexture2D<float4> g_imageOut;
+
+#define AGX_LOOK 2
+
+float3 agxDefaultContrastApprox(float3 x) {
+	float3 x2 = x * x;
+	float3 x4 = x2 * x2;
+
+	return + 15.5     * x4 * x2
+		- 40.14    * x4 * x
+		+ 31.96    * x4
+		- 6.868    * x2 * x
+		+ 0.4298   * x2
+		+ 0.1191   * x
+		- 0.00232;
+}
+
+float3 agx(float3 val) {
+	const float3x3 agx_mat = float3x3(
+			0.842479062253094, 0.0423282422610123, 0.0423756549057051,
+			0.0784335999999992,  0.878468636469772,  0.0784336,
+			0.0792237451477643, 0.0791661274605434, 0.879142973793104);
+
+	const float min_ev = -12.47393f;
+	const float max_ev = 4.026069f;
+
+	val = mul(agx_mat, val);
+
+	val = clamp(log2(val), min_ev, max_ev);
+	val = (val - min_ev) / (max_ev - min_ev);
+
+	val = agxDefaultContrastApprox(val);
+
+	return val;
+}
+
+float3 agxEotf(float3 val) {
+	const float3x3 agx_mat_inv = float3x3(
+			1.19687900512017, -0.0528968517574562, -0.0529716355144438,
+			-0.0980208811401368, 1.15190312990417, -0.0980434501171241,
+			-0.0990297440797205, -0.0989611768448433, 1.15107367264116);
+
+	val = mul(agx_mat_inv, val);
+	val = pow(val, float3(2.2));
+
+	return val;
+}
+
+float3 agxLook(float3 val) {  
+	float3 offset = float3(0.0);
+	float3 slope = float3(1.0);
+	float3 power = float3(1.0);
+	float sat = 1.0;
+
+#if AGX_LOOK == 1
+	slope = float3(1.0, 0.9, 0.5);
+	power = float3(0.8);
+	sat = 0.8;
+#elif AGX_LOOK == 2
+	slope = float3(1.0);
+	power = float3(1.35, 1.35, 1.35);
+	sat = 1.4;
+#endif
+
+	// ASC CDL
+	val = pow(val * slope + offset, power);
+
+	const float3 lw = float3(0.2126, 0.7152, 0.0722);
+	float luma = dot(val, lw);
+
+	return luma + sat * (val - luma);
+}
+
+[shader("compute")]
+[numthreads(32,32,1)]
+void main(uint3 threadId: SV_DispatchThreadID)
+{
+    uint2 coord = threadId.xy;
+    float3 color = g_imageIn.Load(coord).xyz;
+    color = pow(color,2.2);
+    color = agx(color);
+    color = agxLook(color);
+    color = agxEotf(color);
+    color = pow(color,0.45);
+    g_imageOut[coord] = float4(color,1);
+};
+
+