Add shadows

project/resources/ShadingDemo.mtl

@@ -1,2 +1,42 @@
 # Blender 4.3.2 MTL File: 'None'
 # www.blender.org
+
+newmtl Material.001
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800119 0.001607 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.002
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800149 0.000000 0.387990
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.003
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.003822 0.800111 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2
+
+newmtl Material.004
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 2

project/resources/SuperSimpleDiffuse.fx

@@ -77,26 +77,37 @@ float ShadowCalculation(float4 shadowCoord, float3 normal) {
     // Normalize the depth by dividing by the w component
     float3 projCoord = shadowCoord.xyz / shadowCoord.w;
 
+    float shadow = 0.0;
+    uint width, height;
+    gShadowMap.GetDimensions(width, height);
+    float2 texelSize = float2(1.f / width, 1.f / height);
+
     // Convert from [-1, 1] to [0, 1]
     float2 UVCoords;
     UVCoords.x = 0.5f * projCoord.x + 0.5f;
     UVCoords.y = -0.5f * projCoord.y + 0.5f;
-//     float z = 0.5 * projCoord.z + 0.5;
     float z = projCoord.z;
-    // Sample the shadow map
-    float shadowDepth = gShadowMap.Sample(gShadowSampler2, UVCoords.xy).r;
 
-//     float bias = 0.0025f;
+    float bias = max(0.05 * (1.0 - dot(normal, -gLightDirection)), 0.005);
 
-    float bias = max(0.05 * (1.0 - dot(normal, gLightDirection)), 0.005);
+    for(int x = -1; x <= 1; ++x)
+    {
+        for(int y = -1; y <= 1; ++y)
+        {
+            float pcfDepth = gShadowMap.Sample(gShadowSampler2, UVCoords.xy + float2(x, y) * texelSize).r;
+            shadow += z - bias > pcfDepth ? 1.0 : 0.0;
+        }
+    }
 
-//     return gShadowMap.Sample(gShadowSampler2, UVCoords.xy).r;
-    // Check if the current fragment is in shadow
-    if (shadowDepth + bias < z)
-        return 0.5f;
-    else
-        return 1.0f;
+    shadow /= 9.0f;
 
+//     float shadowDepth = gShadowMap.Sample(gShadowSampler2, UVCoords.xy).r;
+
+
+    if(projCoord.z > 1.0)
+            shadow = 0.0;
+
+    return shadow;
 }
 // Pixel shader
 float4 PS(VS_OUTPUT input) : SV_TARGET {
@@ -104,7 +115,7 @@ float4 PS(VS_OUTPUT input) : SV_TARGET {
 
     float3 diffuseColor = gDiffuseMap.Sample(gSampleState, input.TexCoord).rgb;
 
-    float3 finalColor = float3(1.f, 1.f, 1.f) * shadowFactor;
+    float3 finalColor = diffuseColor * (1 - shadowFactor);
     finalColor += gAmbient;
 
     return float4(finalColor, 1.0f);