1 files changed, 50 insertions, 0 deletions
diff --git a/engine/src/core-data/Common/MatDefs/Misc/SoftParticle.frag b/engine/src/core-data/Common/MatDefs/Misc/SoftParticle.frag
new file mode 100644
index 0000000..d3108b5
--- /dev/null
+++ b/engine/src/core-data/Common/MatDefs/Misc/SoftParticle.frag
@@ -0,0 +1,50 @@
+uniform sampler2D m_DepthTexture;
+uniform float m_Softness; // Power used in the contrast function
+varying vec2 vPos; // Position of the pixel
+varying vec2 projPos;// z and w valus in projection space
+
+#ifdef USE_TEXTURE
+uniform sampler2D m_Texture;
+varying vec4 texCoord;
+#endif
+
+varying vec4 color;
+
+float Contrast(float d){
+    float val = clamp( 2.0*( (d > 0.5) ? 1.0-d : d ), 0.0, 1.0);
+    float a = 0.5 * pow(val, m_Softness);
+    return (d > 0.5) ? 1.0 - a : a;
+}
+
+float stdDiff(float d){   
+    return clamp((d)*m_Softness,0.0,1.0);
+}
+
+
+void main(){
+    if (color.a <= 0.01)
+        discard;
+
+    vec4 c = vec4(1.0,1.0,1.0,1.0);//color;
+    #ifdef USE_TEXTURE
+        #ifdef POINT_SPRITE
+            vec2 uv = mix(texCoord.xy, texCoord.zw, gl_PointCoord.xy);
+        #else
+            vec2 uv = texCoord.xy;
+        #endif
+        c = texture2D(m_Texture, uv) * color;
+    #endif
+
+
+    float depthv = texture2D(m_DepthTexture, vPos).x*2.0-1.0; // Scene depth
+    depthv*=projPos.y;   
+    float particleDepth = projPos.x;
+	
+    float zdiff =depthv-particleDepth;
+    if(zdiff<=0.0){
+        discard;
+    }
+    // Computes alpha based on the particles distance to the rest of the scene
+    c.a = c.a * stdDiff(zdiff);// Contrast(zdiff);
+    gl_FragColor =c;
+}
+\ No newline at end of file