fixed some artifacts

Author: geoscan-builder

Source/Renderer/ShaderSource.js

@@ -228,6 +228,9 @@ define([
     precision highp float;\n\
 #else\n\
     precision mediump float;\n\
+#endif\n\n\
+#ifdef GL_EXT_frag_depth\n\
+#extension GL_EXT_frag_depth : enable\n\
 #endif\n\n';
         }
 

Source/Scene/Model.js

@@ -1853,7 +1853,7 @@
     function modifyFsShaderForDepth(shader) {
         shader = ShaderSource.replaceMain(shader, 'czm_main');
         shader +=
-            'varying float v_inverse_depth; \n' +
+            'varying float v_inverse_depth;\n' +
             'void main() \n' +
             '{ \n' +
             '    czm_main(); \n' +
@@ -1866,11 +1866,11 @@
     function modifyVertexShaderForDepth(shader) {
         shader = ShaderSource.replaceMain(shader, 'gltf_morph_main');
         shader +=
-            'varying float v_inverse_depth; \n' +
+            'varying float v_inverse_depth;\n' +
             'void main() \n' +
             '{ \n' +
             '    gltf_morph_main(); \n' +
-            '    v_inverse_depth = 1. / gl_Position.w; \n' +
+            '    v_inverse_depth = 1. / ((u_projectionMatrix * u_modelViewMatrix * vec4(a_position,1.0)).w); \n' +
             '} \n';
 
         return shader;

Source/Shaders/Builtin/Functions/logDepth.glsl

@@ -1,6 +1,3 @@
-#ifdef GL_EXT_frag_depth
-#extension GL_EXT_frag_depth : enable
-#endif
 void czm_logDepth(float w)
 {
 #ifdef GL_EXT_frag_depth

Source/Shaders/ShadowVolumeFS.glsl

@@ -8,7 +8,7 @@ uniform vec4 u_highlightColor;
 varying vec4 v_color;
 #endif
 
-varying float v_inverse_depth;
+varying float v_depth;
 
 void main(void)
 {
@@ -18,5 +18,5 @@ void main(void)
     gl_FragColor = v_color;
 #endif
     //czm_writeDepthClampedToFarPlane();
-    czm_logDepth(v_inverse_depth);
+    czm_logDepth(1. / v_depth);
 }

Source/Shaders/ShadowVolumeVS.glsl

@@ -19,7 +19,7 @@ uniform float u_globeMinimumAltitude;
 #ifndef VECTOR_TILE
 varying vec4 v_color;
 #endif
-varying float v_inverse_depth;
+varying float v_depth;
 
 void main()
 {
@@ -37,7 +37,8 @@ void main()
     //extrudeDirection is zero for the top layer
     position = position + vec4(extrudeDirection * delta, 0.0);
 #endif
-    gl_Position = czm_depthClampFarPlane(czm_modelViewProjectionRelativeToEye * position);
+    vec4 positionEC = czm_modelViewProjectionRelativeToEye * position;
+    gl_Position = czm_depthClampFarPlane(positionEC);
 #endif
-	v_inverse_depth = 1. / gl_Position.w;
+	v_depth = gl_Position.w;
 }