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ShadowVolumeAppearanceFS.glsl
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#ifdef GL_EXT_frag_depth
#extension GL_EXT_frag_depth : enable
#endif
#ifdef TEXTURE_COORDINATES
#ifdef SPHERICAL
varying vec4 v_sphericalExtents;
#else // SPHERICAL
varying vec2 v_inversePlaneExtents;
varying vec4 v_westPlane;
varying vec4 v_southPlane;
#endif // SPHERICAL
varying vec3 v_uvMinAndSphericalLongitudeRotation;
varying vec3 v_uMaxAndInverseDistance;
varying vec3 v_vMaxAndInverseDistance;
#endif // TEXTURE_COORDINATES
#ifdef PER_INSTANCE_COLOR
varying vec4 v_color;
#endif
#ifdef NORMAL_EC
vec3 getEyeCoordinate3FromWindowCoordinate(vec2 fragCoord, float logDepthOrDepth) {
vec4 eyeCoordinate = czm_windowToEyeCoordinates(fragCoord, logDepthOrDepth);
return eyeCoordinate.xyz / eyeCoordinate.w;
}
vec3 vectorFromOffset(vec4 eyeCoordinate, vec2 positiveOffset) {
vec2 glFragCoordXY = gl_FragCoord.xy;
// Sample depths at both offset and negative offset
float upOrRightLogDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, (glFragCoordXY + positiveOffset) / czm_viewport.zw));
float downOrLeftLogDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, (glFragCoordXY - positiveOffset) / czm_viewport.zw));
// Explicitly evaluate both paths
// Necessary for multifrustum and for edges of the screen
bvec2 upOrRightInBounds = lessThan(glFragCoordXY + positiveOffset, czm_viewport.zw);
float useUpOrRight = float(upOrRightLogDepth > 0.0 && upOrRightInBounds.x && upOrRightInBounds.y);
float useDownOrLeft = float(useUpOrRight == 0.0);
vec3 upOrRightEC = getEyeCoordinate3FromWindowCoordinate(glFragCoordXY + positiveOffset, upOrRightLogDepth);
vec3 downOrLeftEC = getEyeCoordinate3FromWindowCoordinate(glFragCoordXY - positiveOffset, downOrLeftLogDepth);
return (upOrRightEC - (eyeCoordinate.xyz / eyeCoordinate.w)) * useUpOrRight + ((eyeCoordinate.xyz / eyeCoordinate.w) - downOrLeftEC) * useDownOrLeft;
}
#endif // NORMAL_EC
void main(void)
{
#ifdef REQUIRES_EC
float logDepthOrDepth = czm_unpackDepth(texture2D(czm_globeDepthTexture, gl_FragCoord.xy / czm_viewport.zw));
vec4 eyeCoordinate = czm_windowToEyeCoordinates(gl_FragCoord.xy, logDepthOrDepth);
#endif
#ifdef REQUIRES_WC
vec4 worldCoordinate4 = czm_inverseView * eyeCoordinate;
vec3 worldCoordinate = worldCoordinate4.xyz / worldCoordinate4.w;
#endif
#ifdef TEXTURE_COORDINATES
vec2 uv;
#ifdef SPHERICAL
// Treat world coords as a sphere normal for spherical coordinates
vec2 sphericalLatLong = czm_approximateSphericalCoordinates(worldCoordinate);
sphericalLatLong.y += v_uvMinAndSphericalLongitudeRotation.z;
sphericalLatLong.y = czm_branchFreeTernary(sphericalLatLong.y < czm_pi, sphericalLatLong.y, sphericalLatLong.y - czm_twoPi);
uv.x = (sphericalLatLong.y - v_sphericalExtents.y) * v_sphericalExtents.w;
uv.y = (sphericalLatLong.x - v_sphericalExtents.x) * v_sphericalExtents.z;
#else // SPHERICAL
// Unpack planes and transform to eye space
uv.x = czm_planeDistance(v_westPlane, eyeCoordinate.xyz / eyeCoordinate.w) * v_inversePlaneExtents.x;
uv.y = czm_planeDistance(v_southPlane, eyeCoordinate.xyz / eyeCoordinate.w) * v_inversePlaneExtents.y;
#endif // SPHERICAL
#endif // TEXTURE_COORDINATES
#ifdef PICK
#ifdef CULL_FRAGMENTS
// When classifying translucent geometry, logDepthOrDepth == 0.0
// indicates a region that should not be classified, possibly due to there
// being opaque pixels there in another buffer.
// Check for logDepthOrDepth != 0.0 to make sure this should be classified.
if (0.0 <= uv.x && uv.x <= 1.0 && 0.0 <= uv.y && uv.y <= 1.0 || logDepthOrDepth != 0.0) {
gl_FragColor.a = 1.0; // 0.0 alpha leads to discard from ShaderSource.createPickFragmentShaderSource
czm_writeDepthClamp();
}
#else // CULL_FRAGMENTS
gl_FragColor.a = 1.0;
#endif // CULL_FRAGMENTS
#else // PICK
#ifdef CULL_FRAGMENTS
// When classifying translucent geometry, logDepthOrDepth == 0.0
// indicates a region that should not be classified, possibly due to there
// being opaque pixels there in another buffer.
if (uv.x <= 0.0 || 1.0 <= uv.x || uv.y <= 0.0 || 1.0 <= uv.y || logDepthOrDepth == 0.0) {
discard;
}
#endif
#ifdef NORMAL_EC
// Compute normal by sampling adjacent pixels in 2x2 block in screen space
vec3 downUp = vectorFromOffset(eyeCoordinate, vec2(0.0, 1.0));
vec3 leftRight = vectorFromOffset(eyeCoordinate, vec2(1.0, 0.0));
vec3 normalEC = normalize(cross(leftRight, downUp));
#endif
#ifdef PER_INSTANCE_COLOR
vec4 color = czm_gammaCorrect(v_color);
#ifdef FLAT
gl_FragColor = color;
#else // FLAT
czm_materialInput materialInput;
materialInput.normalEC = normalEC;
materialInput.positionToEyeEC = -eyeCoordinate.xyz;
czm_material material = czm_getDefaultMaterial(materialInput);
material.diffuse = color.rgb;
material.alpha = color.a;
gl_FragColor = czm_phong(normalize(-eyeCoordinate.xyz), material, czm_lightDirectionEC);
#endif // FLAT
// Premultiply alpha. Required for classification primitives on translucent globe.
gl_FragColor.rgb *= gl_FragColor.a;
#else // PER_INSTANCE_COLOR
// Material support.
// USES_ is distinct from REQUIRES_, because some things are dependencies of each other or
// dependencies for culling but might not actually be used by the material.
czm_materialInput materialInput;
#ifdef USES_NORMAL_EC
materialInput.normalEC = normalEC;
#endif
#ifdef USES_POSITION_TO_EYE_EC
materialInput.positionToEyeEC = -eyeCoordinate.xyz;
#endif
#ifdef USES_TANGENT_TO_EYE
materialInput.tangentToEyeMatrix = czm_eastNorthUpToEyeCoordinates(worldCoordinate, normalEC);
#endif
#ifdef USES_ST
// Remap texture coordinates from computed (approximately aligned with cartographic space) to the desired
// texture coordinate system, which typically forms a tight oriented bounding box around the geometry.
// Shader is provided a set of reference points for remapping.
materialInput.st.x = czm_lineDistance(v_uvMinAndSphericalLongitudeRotation.xy, v_uMaxAndInverseDistance.xy, uv) * v_uMaxAndInverseDistance.z;
materialInput.st.y = czm_lineDistance(v_uvMinAndSphericalLongitudeRotation.xy, v_vMaxAndInverseDistance.xy, uv) * v_vMaxAndInverseDistance.z;
#endif
czm_material material = czm_getMaterial(materialInput);
#ifdef FLAT
gl_FragColor = vec4(material.diffuse + material.emission, material.alpha);
#else // FLAT
gl_FragColor = czm_phong(normalize(-eyeCoordinate.xyz), material, czm_lightDirectionEC);
#endif // FLAT
// Premultiply alpha. Required for classification primitives on translucent globe.
gl_FragColor.rgb *= gl_FragColor.a;
#endif // PER_INSTANCE_COLOR
czm_writeDepthClamp();
#endif // PICK
}