varying float cosLight;
varying float f_normal_length;
varying vec3 shadow_position;
+ varying float perspective_factor;
#endif
#if SHADOW_FILTER == 2
- #define PCFBOUND 3.5
- #define PCFSAMPLES 64.0
+ #define PCFBOUND 2.0 // 5x5
+ #define PCFSAMPLES 25
#elif SHADOW_FILTER == 1
- #define PCFBOUND 1.5
- #if defined(POISSON_FILTER)
- #define PCFSAMPLES 32.0
- #else
- #define PCFSAMPLES 16.0
- #endif
+ #define PCFBOUND 1.0 // 3x3
+ #define PCFSAMPLES 9
#else
#define PCFBOUND 0.0
- #if defined(POISSON_FILTER)
- #define PCFSAMPLES 4.0
- #else
- #define PCFSAMPLES 1.0
- #endif
+ #define PCFSAMPLES 1
#endif
+
#ifdef COLORED_SHADOWS
float getHardShadowDepth(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
}
#endif
-float getBaseLength(vec2 smTexCoord)
-{
- float l = length(2.0 * smTexCoord.xy - 1.0 - CameraPos.xy); // length in texture coords
- return xyPerspectiveBias1 / (1.0 / l - xyPerspectiveBias0); // return to undistorted coords
-}
-
-float getDeltaPerspectiveFactor(float l)
-{
- return 0.04 * pow(512.0 / f_textureresolution, 0.4) / (xyPerspectiveBias0 * l + xyPerspectiveBias1); // original distortion factor, divided by 10
-}
+#define BASEFILTERRADIUS 1.0
-float getPenumbraRadius(sampler2D shadowsampler, vec2 smTexCoord, float realDistance, float multiplier)
+float getPenumbraRadius(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
- float baseLength = getBaseLength(smTexCoord);
- float perspectiveFactor;
-
// Return fast if sharp shadows are requested
- if (PCFBOUND == 0.0)
+ if (PCFBOUND == 0.0 || SOFTSHADOWRADIUS <= 0.0)
return 0.0;
- if (SOFTSHADOWRADIUS <= 1.0) {
- perspectiveFactor = getDeltaPerspectiveFactor(baseLength);
- return max(2 * length(smTexCoord.xy) * 2048 / f_textureresolution / pow(perspectiveFactor, 3), SOFTSHADOWRADIUS);
- }
-
vec2 clampedpos;
- float texture_size = 1.0 / (2048 /*f_textureresolution*/ * 0.5);
float y, x;
- float depth = 0.0;
- float pointDepth;
- float maxRadius = SOFTSHADOWRADIUS * 5.0 * multiplier;
-
- float bound = clamp(PCFBOUND * (1 - baseLength), 0.0, PCFBOUND);
- int n = 0;
-
- for (y = -bound; y <= bound; y += 1.0)
- for (x = -bound; x <= bound; x += 1.0) {
- clampedpos = vec2(x,y);
- perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * maxRadius);
- clampedpos = clampedpos * texture_size * perspectiveFactor * maxRadius * perspectiveFactor + smTexCoord.xy;
-
- pointDepth = getHardShadowDepth(shadowsampler, clampedpos.xy, realDistance);
- if (pointDepth > -0.01) {
- depth += pointDepth;
- n += 1;
- }
- }
-
- depth = depth / n;
- depth = pow(clamp(depth, 0.0, 1000.0), 1.6) / 0.001;
-
- perspectiveFactor = getDeltaPerspectiveFactor(baseLength);
- return max(length(smTexCoord.xy) * 2 * 2048 / f_textureresolution / pow(perspectiveFactor, 3), depth * maxRadius);
+ float depth = getHardShadowDepth(shadowsampler, smTexCoord.xy, realDistance);
+ // A factor from 0 to 1 to reduce blurring of short shadows
+ float sharpness_factor = 1.0;
+ // conversion factor from shadow depth to blur radius
+ float depth_to_blur = f_shadowfar / SOFTSHADOWRADIUS / xyPerspectiveBias0;
+ if (depth > 0.0 && f_normal_length > 0.0)
+ // 5 is empirical factor that controls how fast shadow loses sharpness
+ sharpness_factor = clamp(5 * depth * depth_to_blur, 0.0, 1.0);
+ depth = 0.0;
+
+ float world_to_texture = xyPerspectiveBias1 / perspective_factor / perspective_factor
+ * f_textureresolution / 2.0 / f_shadowfar;
+ float world_radius = 0.2; // shadow blur radius in world float coordinates, e.g. 0.2 = 0.02 of one node
+
+ return max(BASEFILTERRADIUS * f_textureresolution / 4096.0, sharpness_factor * world_radius * world_to_texture * SOFTSHADOWRADIUS);
}
#ifdef POISSON_FILTER
vec4 getShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
- vec2 clampedpos;
- vec4 visibility = vec4(0.0);
- float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.5); // scale to align with PCF
+ float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance);
if (radius < 0.1) {
// we are in the middle of even brightness, no need for filtering
return getHardShadowColor(shadowsampler, smTexCoord.xy, realDistance);
}
- float baseLength = getBaseLength(smTexCoord);
- float perspectiveFactor;
+ vec2 clampedpos;
+ vec4 visibility = vec4(0.0);
+ float scale_factor = radius / f_textureresolution;
- float texture_size = 1.0 / (f_textureresolution * 0.5);
- int samples = int(clamp(PCFSAMPLES * (1 - baseLength) * (1 - baseLength), PCFSAMPLES / 4, PCFSAMPLES));
+ int samples = (1 + 1 * int(SOFTSHADOWRADIUS > 1.0)) * PCFSAMPLES; // scale max samples for the soft shadows
+ samples = int(clamp(pow(4.0 * radius + 1.0, 2.0), 1.0, float(samples)));
int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-samples)));
int end_offset = int(samples) + init_offset;
for (int x = init_offset; x < end_offset; x++) {
- clampedpos = poissonDisk[x];
- perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius);
- clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor + smTexCoord.xy;
+ clampedpos = poissonDisk[x] * scale_factor + smTexCoord.xy;
visibility += getHardShadowColor(shadowsampler, clampedpos.xy, realDistance);
}
float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
- vec2 clampedpos;
- float visibility = 0.0;
- float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.5); // scale to align with PCF
+ float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance);
if (radius < 0.1) {
// we are in the middle of even brightness, no need for filtering
return getHardShadow(shadowsampler, smTexCoord.xy, realDistance);
}
- float baseLength = getBaseLength(smTexCoord);
- float perspectiveFactor;
+ vec2 clampedpos;
+ float visibility = 0.0;
+ float scale_factor = radius / f_textureresolution;
- float texture_size = 1.0 / (f_textureresolution * 0.5);
- int samples = int(clamp(PCFSAMPLES * (1 - baseLength) * (1 - baseLength), PCFSAMPLES / 4, PCFSAMPLES));
+ int samples = (1 + 1 * int(SOFTSHADOWRADIUS > 1.0)) * PCFSAMPLES; // scale max samples for the soft shadows
+ samples = int(clamp(pow(4.0 * radius + 1.0, 2.0), 1.0, float(samples)));
int init_offset = int(floor(mod(((smTexCoord.x * 34.0) + 1.0) * smTexCoord.y, 64.0-samples)));
int end_offset = int(samples) + init_offset;
for (int x = init_offset; x < end_offset; x++) {
- clampedpos = poissonDisk[x];
- perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius);
- clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor + smTexCoord.xy;
+ clampedpos = poissonDisk[x] * scale_factor + smTexCoord.xy;
visibility += getHardShadow(shadowsampler, clampedpos.xy, realDistance);
}
vec4 getShadowColor(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
- vec2 clampedpos;
- vec4 visibility = vec4(0.0);
- float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.0);
+ float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance);
if (radius < 0.1) {
// we are in the middle of even brightness, no need for filtering
return getHardShadowColor(shadowsampler, smTexCoord.xy, realDistance);
}
- float baseLength = getBaseLength(smTexCoord);
- float perspectiveFactor;
-
- float texture_size = 1.0 / (f_textureresolution * 0.5);
- float y, x;
- float bound = clamp(PCFBOUND * (1 - baseLength), PCFBOUND / 2, PCFBOUND);
- int n = 0;
+ vec2 clampedpos;
+ vec4 visibility = vec4(0.0);
+ float x, y;
+ float bound = (1 + 0.5 * int(SOFTSHADOWRADIUS > 1.0)) * PCFBOUND; // scale max bound for soft shadows
+ bound = clamp(0.5 * (4.0 * radius - 1.0), 0.5, bound);
+ float scale_factor = radius / bound / f_textureresolution;
+ float n = 0.0;
// basic PCF filter
for (y = -bound; y <= bound; y += 1.0)
for (x = -bound; x <= bound; x += 1.0) {
- clampedpos = vec2(x,y); // screen offset
- perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius / bound);
- clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor / bound + smTexCoord.xy; // both dx,dy and radius are adjusted
+ clampedpos = vec2(x,y) * scale_factor + smTexCoord.xy;
visibility += getHardShadowColor(shadowsampler, clampedpos.xy, realDistance);
- n += 1;
+ n += 1.0;
}
- return visibility / n;
+ return visibility / max(n, 1.0);
}
#else
float getShadow(sampler2D shadowsampler, vec2 smTexCoord, float realDistance)
{
- vec2 clampedpos;
- float visibility = 0.0;
- float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance, 1.0);
+ float radius = getPenumbraRadius(shadowsampler, smTexCoord, realDistance);
if (radius < 0.1) {
// we are in the middle of even brightness, no need for filtering
return getHardShadow(shadowsampler, smTexCoord.xy, realDistance);
}
- float baseLength = getBaseLength(smTexCoord);
- float perspectiveFactor;
-
- float texture_size = 1.0 / (f_textureresolution * 0.5);
- float y, x;
- float bound = clamp(PCFBOUND * (1 - baseLength), PCFBOUND / 2, PCFBOUND);
- int n = 0;
+ vec2 clampedpos;
+ float visibility = 0.0;
+ float x, y;
+ float bound = (1 + 0.5 * int(SOFTSHADOWRADIUS > 1.0)) * PCFBOUND; // scale max bound for soft shadows
+ bound = clamp(0.5 * (4.0 * radius - 1.0), 0.5, bound);
+ float scale_factor = radius / bound / f_textureresolution;
+ float n = 0.0;
// basic PCF filter
for (y = -bound; y <= bound; y += 1.0)
for (x = -bound; x <= bound; x += 1.0) {
- clampedpos = vec2(x,y); // screen offset
- perspectiveFactor = getDeltaPerspectiveFactor(baseLength + length(clampedpos) * texture_size * radius / bound);
- clampedpos = clampedpos * texture_size * perspectiveFactor * radius * perspectiveFactor / bound + smTexCoord.xy; // both dx,dy and radius are adjusted
+ clampedpos = vec2(x,y) * scale_factor + smTexCoord.xy;
visibility += getHardShadow(shadowsampler, clampedpos.xy, realDistance);
- n += 1;
+ n += 1.0;
}
- return visibility / n;
+ return visibility / max(n, 1.0);
}
#endif
projects / dragonfireclient.git / blobdiff