1 files changed, 70 insertions, 0 deletions
diff --git a/src/engine/shaders/fragmentShadow b/src/engine/shaders/fragmentShadow
new file mode 100644
index 00000000..2c3c2ded
--- /dev/null
+++ b/src/engine/shaders/fragmentShadow
@@ -0,0 +1,70 @@
+varying highp vec4 shadowCoord;
+varying highp vec2 UV;
+varying highp vec3 position_wrld;
+varying highp vec3 normal_cmr;
+varying highp vec3 eyeDirection_cmr;
+varying highp vec3 lightDirection_cmr;
+
+uniform highp float lightStrength;
+uniform highp float ambientStrength;
+uniform sampler2D textureSampler;
+//uniform sampler2DShadow shadowMap; // use with version 2
+uniform sampler2D shadowMap; // use with version 1
+
+// Version 1: Use this to see the shadow map
+
+void main() {
+    float shadowFactor = 1.0; // default to '1' meaning "no shadow"
+    float epsilon = 0.1; // increase value to remove little artifacts
+    vec4 shadCoordsPD = shadowCoord / shadowCoord.w;
+    if (shadowCoord.w <= 0.0) { // ignore negative projection
+        shadowFactor = 1.0;
+    } else if (shadCoordsPD.x < 0.0 || shadCoordsPD.y < 0.0) { // outside light frustum, ignore
+        shadowFactor = 1.0;
+    } else if (shadCoordsPD.x >= 1.0 || shadCoordsPD.y >= 1.0) { // outside light frustum, ignore
+        shadowFactor = 1.0;
+    } else {
+        float shadow = texture2D(shadowMap, shadCoordsPD.xy).x;
+        if (shadow + epsilon < shadCoordsPD.z) {
+            shadowFactor = 0.0;
+        }
+    }
+    // shadow is dark gray, other parts bright yellow
+    gl_FragColor = vec4(0.8, 0.8, 0.0, 1.0) * shadowFactor + vec4(0.2, 0.2, 0.2, 1.0);
+}
+
+// Version 2: Use this normally
+/*
+void main() {
+    highp vec3 materialDiffuseColor = vec3(0.8, 0.8, 0.0);//texture2D(textureSampler, UV).rgb;
+    highp vec3 materialAmbientColor = vec3(ambientStrength, ambientStrength, ambientStrength) * materialDiffuseColor;
+    highp vec3 materialSpecularColor = vec3(1.0, 1.0, 1.0);
+
+    highp vec3 n = normalize(normal_cmr);
+    highp vec3 l = normalize(lightDirection_cmr);
+    highp float cosTheta = dot(n, l);
+    if (cosTheta < 0.0) { cosTheta = 0.0; }
+    if (cosTheta > 1.0) { cosTheta = 1.0; }
+
+    highp vec3 E = normalize(eyeDirection_cmr);
+    highp vec3 R = reflect(-l, n);
+    highp float cosAlpha = dot(E, R);
+    if (cosAlpha < 0.0) { cosAlpha = 0.0; }
+    if (cosAlpha > 1.0) { cosAlpha = 1.0; }
+
+    highp float visibility = 1.0;
+    highp float bias = 0.005;
+
+    //highp float bias = 0.005 * tan(acos(cosTheta));
+    //if (bias < 0.0) { bias = 0.0; }
+    //if (bias > 0.01) { bias = 0.01; }
+
+    visibility -= 0.8 * (1.0 - shadow2D(shadowMap, vec3(shadowCoord.xy, (shadowCoord.z - bias) / shadowCoord.w)).r);
+
+    gl_FragColor.rgb =
+        materialAmbientColor +
+        visibility * materialDiffuseColor * lightStrength * cosTheta +
+        visibility * materialSpecularColor * lightStrength * (cosAlpha * cosAlpha * cosAlpha * cosAlpha * cosAlpha);
+    gl_FragColor.a = 1.0;
+}
+*/