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refining the shadowing

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This commit is contained in:
Sam Gateau 2015-01-02 11:29:54 -08:00
parent ef7c002237
commit 24d39f4453
1 changed files with 21 additions and 23 deletions
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42
libraries/render-utils/src/directional_light_shadow_map.slf
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@ -55,48 +55,46 @@ void main(void) {
// compute the corresponding texture coordinates
vec3 shadowTexCoord = vec3(dot(gl_EyePlaneS[0], position), dot(gl_EyePlaneT[0], position), dot(gl_EyePlaneR[0], position));
// evaluate the shadow test but only relevant for light facing fragments
float shadowAttenuation = (0.25 *
(shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, -shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, -shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, shadowScale, 0.0)).r));
// get the normal from the map
vec4 normal = normalVal;
if ((normalVal.a >= 0.45) && (normalVal.a <= 0.55)) {
normal.a = 1.0;
normalVal.a = 0.0;
// compute the corresponding texture coordinates
vec3 shadowTexCoord = vec3(dot(gl_EyePlaneS[0], position), dot(gl_EyePlaneT[0], position), dot(gl_EyePlaneR[0], position));
// get the normal from the map
vec3 normalizedNormal = normalize(normal.xyz * 2.0 - vec3(1.0));
// how much this fragment faces the light direction
float faceLight = step(-0.005, dot(normalizedNormal, gl_LightSource[0].position.xyz));
float diffuse = dot(normalizedNormal, gl_LightSource[0].position.xyz);
// need to catch normals perpendicular to the projection plane hence the magic number for the threshold
// it should be just 0, be we have innacurracy so we need to overshoot
const float PERPENDICULAR_THREASHOLD = -0.005;
float facingLight = step(PERPENDICULAR_THREASHOLD, diffuse);
// evaluate the shadow test but only relevant for light facing fragments
float attenuation = (1 - faceLight) + faceLight * (0.25 *
(shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, -shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, -shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, shadowScale, 0.0)).r));
float lightAttenuation = (1 - facingLight) + facingLight * shadowAttenuation;
// diffuse light is the lightmap dimmed by shadow
vec3 diffuseLight = lightAttenuation * specularVal.rgb;
// ambient is a tiny percentage of the lightmap and only when in the shadow
vec3 ambientLight = (1 - lightAttenuation) * 0.5 * specularVal.rgb;
gl_FragColor = vec4(diffuseVal.rgb * (
(gl_FrontLightModelProduct.sceneColor.rgb + gl_FrontLightProduct[0].ambient.rgb) * (1.0 - attenuation) +
specularVal.rgb * attenuation), 1.0);
// gl_FragColor = vec4(diffuseVal.rgb * specularVal.rgb, 1.0);
gl_FragColor = vec4(diffuseVal.rgb * (ambientLight + diffuseLight), 1.0);
} else {
// compute the corresponding texture coordinates
vec3 shadowTexCoord = vec3(dot(gl_EyePlaneS[0], position), dot(gl_EyePlaneT[0], position), dot(gl_EyePlaneR[0], position));
// get the normal from the map
vec3 normalizedNormal = normalize(normal.xyz * 2.0 - vec3(1.0));
// average values from the shadow map
float diffuse = dot(normalizedNormal, gl_LightSource[0].position.xyz);
float facingLight = step(0.0, diffuse) * 0.25 *
(shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, -shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, -shadowScale, 0.0)).r +
shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, shadowScale, 0.0)).r);
float facingLight = step(0.0, diffuse) * shadowAttenuation;
// compute the base color based on OpenGL lighting model
vec3 baseColor = diffuseVal.rgb * (gl_FrontLightModelProduct.sceneColor.rgb +