From 8f9fae7815f24ca59e2a7e180b7baab3bc75e2e7 Mon Sep 17 00:00:00 2001
From: Dave Parks <davep@lindenlab.com>
Date: Sat, 20 Mar 2010 14:15:13 -0500
Subject: SSAO version of sunLight shaders.
---
.../shaders/class1/deferred/sunLightSSAOF.glsl | 123 ++++++++++
.../shaders/class2/deferred/sunLightSSAOF.glsl | 248 +++++++++++++++++++++
2 files changed, 371 insertions(+)
create mode 100644 indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
create mode 100644 indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
(limited to 'indra')
diff --git a/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
new file mode 100644
index 0000000000..7450817ea7
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/deferred/sunLightSSAOF.glsl
@@ -0,0 +1,123 @@
+/**
+ * @file sunLightSSAOF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#extension GL_ARB_texture_rectangle : enable
+
+//class 1 -- no shadow, SSAO only
+
+uniform sampler2DRect depthMap;
+uniform sampler2DRect normalMap;
+uniform sampler2D noiseMap;
+
+uniform sampler2D lightFunc;
+
+
+// Inputs
+uniform mat4 shadow_matrix[6];
+uniform vec4 shadow_clip;
+uniform float ssao_radius;
+uniform float ssao_max_radius;
+uniform float ssao_factor;
+uniform float ssao_factor_inv;
+
+varying vec2 vary_fragcoord;
+varying vec4 vary_light;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+
+uniform float shadow_bias;
+uniform float shadow_offset;
+
+vec4 getPosition(vec2 pos_screen)
+{
+ float depth = texture2DRect(depthMap, pos_screen.xy).a;
+ vec2 sc = pos_screen.xy*2.0;
+ sc /= screen_res;
+ sc -= vec2(1.0,1.0);
+ vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+ vec4 pos = inv_proj * ndc;
+ pos /= pos.w;
+ pos.w = 1.0;
+ return pos;
+}
+
+//calculate decreases in ambient lighting when crowded out (SSAO)
+float calcAmbientOcclusion(vec4 pos, vec3 norm)
+{
+ float ret = 1.0;
+
+ float dist = dot(pos.xyz,pos.xyz);
+
+ if (dist < 64.0*64.0)
+ {
+ vec2 kern[8];
+ // exponentially (^2) distant occlusion samples spread around origin
+ kern[0] = vec2(-1.0, 0.0) * 0.125*0.125;
+ kern[1] = vec2(1.0, 0.0) * 0.250*0.250;
+ kern[2] = vec2(0.0, 1.0) * 0.375*0.375;
+ kern[3] = vec2(0.0, -1.0) * 0.500*0.500;
+ kern[4] = vec2(0.7071, 0.7071) * 0.625*0.625;
+ kern[5] = vec2(-0.7071, -0.7071) * 0.750*0.750;
+ kern[6] = vec2(-0.7071, 0.7071) * 0.875*0.875;
+ kern[7] = vec2(0.7071, -0.7071) * 1.000*1.000;
+
+ vec2 pos_screen = vary_fragcoord.xy;
+ vec3 pos_world = pos.xyz;
+ vec2 noise_reflect = texture2D(noiseMap, vary_fragcoord.xy/128.0).xy;
+
+ float angle_hidden = 0.0;
+ int points = 0;
+
+ float scale = min(ssao_radius / -pos_world.z, ssao_max_radius);
+
+ // it was found that keeping # of samples a constant was the fastest, probably due to compiler optimizations (unrolling?)
+ for (int i = 0; i < 8; i++)
+ {
+ vec2 samppos_screen = pos_screen + scale * reflect(kern[i], noise_reflect);
+ vec3 samppos_world = getPosition(samppos_screen).xyz;
+
+ vec3 diff = pos_world - samppos_world;
+ float dist2 = dot(diff, diff);
+
+ // assume each sample corresponds to an occluding sphere with constant radius, constant x-sectional area
+ // --> solid angle shrinking by the square of distance
+ //radius is somewhat arbitrary, can approx with just some constant k * 1 / dist^2
+ //(k should vary inversely with # of samples, but this is taken care of later)
+
+ //if (dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) // -0.05*norm to shift sample point back slightly for flat surfaces
+ // angle_hidden += min(1.0/dist2, ssao_factor_inv); // dist != 0 follows from conditional. max of 1.0 (= ssao_factor_inv * ssao_factor)
+ angle_hidden = angle_hidden + float(dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) * min(1.0/dist2, ssao_factor_inv);
+
+ // 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion"
+ points = points + int(diff.z > -1.0);
+ }
+
+ angle_hidden = min(ssao_factor*angle_hidden/float(points), 1.0);
+
+ ret = (1.0 - (float(points != 0) * angle_hidden));
+ ret += max((dist-32.0*32.0)/(32.0*32.0), 0.0);
+ }
+
+ return min(ret, 1.0);
+}
+
+void main()
+{
+ vec2 pos_screen = vary_fragcoord.xy;
+
+ //try doing an unproject here
+
+ vec4 pos = getPosition(pos_screen);
+
+ vec3 norm = texture2DRect(normalMap, pos_screen).xyz*2.0-1.0;
+
+ gl_FragColor[0] = 1.0;
+ gl_FragColor[1] = calcAmbientOcclusion(pos, norm);
+ gl_FragColor[2] = 1.0;
+ gl_FragColor[3] = 1.0;
+}
diff --git a/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
new file mode 100644
index 0000000000..d77d17942a
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class2/deferred/sunLightSSAOF.glsl
@@ -0,0 +1,248 @@
+/**
+ * @file sunLightSSAOF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#extension GL_ARB_texture_rectangle : enable
+
+//class 2 -- shadows and SSAO
+
+uniform sampler2DRect depthMap;
+uniform sampler2DRect normalMap;
+uniform sampler2DRectShadow shadowMap0;
+uniform sampler2DRectShadow shadowMap1;
+uniform sampler2DRectShadow shadowMap2;
+uniform sampler2DRectShadow shadowMap3;
+uniform sampler2DShadow shadowMap4;
+uniform sampler2DShadow shadowMap5;
+uniform sampler2D noiseMap;
+
+uniform sampler2D lightFunc;
+
+// Inputs
+uniform mat4 shadow_matrix[6];
+uniform vec4 shadow_clip;
+uniform float ssao_radius;
+uniform float ssao_max_radius;
+uniform float ssao_factor;
+uniform float ssao_factor_inv;
+
+varying vec2 vary_fragcoord;
+varying vec4 vary_light;
+
+uniform mat4 inv_proj;
+uniform vec2 screen_res;
+uniform vec2 shadow_res;
+uniform vec2 proj_shadow_res;
+
+uniform float shadow_bias;
+uniform float shadow_offset;
+
+vec4 getPosition(vec2 pos_screen)
+{
+ float depth = texture2DRect(depthMap, pos_screen.xy).a;
+ vec2 sc = pos_screen.xy*2.0;
+ sc /= screen_res;
+ sc -= vec2(1.0,1.0);
+ vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+ vec4 pos = inv_proj * ndc;
+ pos /= pos.w;
+ pos.w = 1.0;
+ return pos;
+}
+
+//calculate decreases in ambient lighting when crowded out (SSAO)
+float calcAmbientOcclusion(vec4 pos, vec3 norm)
+{
+ float ret = 1.0;
+
+ float dist = dot(pos.xyz,pos.xyz);
+
+ if (dist < 64.0*64.0)
+ {
+ vec2 kern[8];
+ // exponentially (^2) distant occlusion samples spread around origin
+ kern[0] = vec2(-1.0, 0.0) * 0.125*0.125;
+ kern[1] = vec2(1.0, 0.0) * 0.250*0.250;
+ kern[2] = vec2(0.0, 1.0) * 0.375*0.375;
+ kern[3] = vec2(0.0, -1.0) * 0.500*0.500;
+ kern[4] = vec2(0.7071, 0.7071) * 0.625*0.625;
+ kern[5] = vec2(-0.7071, -0.7071) * 0.750*0.750;
+ kern[6] = vec2(-0.7071, 0.7071) * 0.875*0.875;
+ kern[7] = vec2(0.7071, -0.7071) * 1.000*1.000;
+
+ vec2 pos_screen = vary_fragcoord.xy;
+ vec3 pos_world = pos.xyz;
+ vec2 noise_reflect = texture2D(noiseMap, vary_fragcoord.xy/128.0).xy;
+
+ float angle_hidden = 0.0;
+ int points = 0;
+
+ float scale = min(ssao_radius / -pos_world.z, ssao_max_radius);
+
+ // it was found that keeping # of samples a constant was the fastest, probably due to compiler optimizations (unrolling?)
+ for (int i = 0; i < 8; i++)
+ {
+ vec2 samppos_screen = pos_screen + scale * reflect(kern[i], noise_reflect);
+ vec3 samppos_world = getPosition(samppos_screen).xyz;
+
+ vec3 diff = pos_world - samppos_world;
+ float dist2 = dot(diff, diff);
+
+ // assume each sample corresponds to an occluding sphere with constant radius, constant x-sectional area
+ // --> solid angle shrinking by the square of distance
+ //radius is somewhat arbitrary, can approx with just some constant k * 1 / dist^2
+ //(k should vary inversely with # of samples, but this is taken care of later)
+
+ //if (dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) // -0.05*norm to shift sample point back slightly for flat surfaces
+ // angle_hidden += min(1.0/dist2, ssao_factor_inv); // dist != 0 follows from conditional. max of 1.0 (= ssao_factor_inv * ssao_factor)
+ angle_hidden = angle_hidden + float(dot((samppos_world - 0.05*norm - pos_world), norm) > 0.0) * min(1.0/dist2, ssao_factor_inv);
+
+ // 'blocked' samples (significantly closer to camera relative to pos_world) are "no data", not "no occlusion"
+ points = points + int(diff.z > -1.0);
+ }
+
+ angle_hidden = min(ssao_factor*angle_hidden/float(points), 1.0);
+
+ ret = (1.0 - (float(points != 0) * angle_hidden));
+ ret += max((dist-32.0*32.0)/(32.0*32.0), 0.0);
+ }
+
+ return min(ret, 1.0);
+}
+
+float pcfShadow(sampler2DRectShadow shadowMap, vec4 stc, float scl)
+{
+ stc.xyz /= stc.w;
+ stc.z += shadow_bias*scl;
+
+ float cs = shadow2DRect(shadowMap, stc.xyz).x;
+ float shadow = cs;
+
+ shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, 1.5, 0.0)).x, cs);
+ shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(1.5, -1.5, 0.0)).x, cs);
+ shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, 1.5, 0.0)).x, cs);
+ shadow += max(shadow2DRect(shadowMap, stc.xyz+vec3(-1.5, -1.5, 0.0)).x, cs);
+
+ return shadow/5.0;
+
+ //return shadow;
+}
+
+float pcfShadow(sampler2DShadow shadowMap, vec4 stc, float scl)
+{
+ stc.xyz /= stc.w;
+ stc.z += shadow_bias*scl;
+
+ float cs = shadow2D(shadowMap, stc.xyz).x;
+ float shadow = cs;
+
+ vec2 off = 1.5/proj_shadow_res;
+
+ shadow += max(shadow2D(shadowMap, stc.xyz+vec3(off.x, off.y, 0.0)).x, cs);
+ shadow += max(shadow2D(shadowMap, stc.xyz+vec3(off.x, -off.y, 0.0)).x, cs);
+ shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, off.y, 0.0)).x, cs);
+ shadow += max(shadow2D(shadowMap, stc.xyz+vec3(-off.x, -off.y, 0.0)).x, cs);
+
+
+ return shadow/5.0;
+
+ //return shadow;
+}
+
+void main()
+{
+ vec2 pos_screen = vary_fragcoord.xy;
+
+ //try doing an unproject here
+
+ vec4 pos = getPosition(pos_screen);
+
+ vec4 nmap4 = texture2DRect(normalMap, pos_screen);
+ float displace = nmap4.w;
+ vec3 norm = nmap4.xyz*2.0-1.0;
+
+ /*if (pos.z == 0.0) // do nothing for sky *FIX: REMOVE THIS IF/WHEN THE POSITION MAP IS BEING USED AS A STENCIL
+ {
+ gl_FragColor = vec4(0.0); // doesn't matter
+ return;
+ }*/
+
+ float shadow = 1.0;
+ float dp_directional_light = max(0.0, dot(norm, vary_light.xyz));
+
+ vec4 spos = vec4(pos.xyz + displace*norm + vary_light.xyz * (1.0-dp_directional_light)*shadow_offset, 1.0);
+
+ if (spos.z > -shadow_clip.w)
+ {
+ if (dp_directional_light == 0.0)
+ {
+ // if we know this point is facing away from the sun then we know it's in shadow without having to do a squirrelly shadow-map lookup
+ shadow = 0.0;
+ }
+ else
+ {
+ vec4 lpos;
+
+ if (spos.z < -shadow_clip.z)
+ {
+ lpos = shadow_matrix[3]*spos;
+ lpos.xy *= shadow_res;
+ shadow = pcfShadow(shadowMap3, lpos, 0.25);
+ shadow += max((pos.z+shadow_clip.z)/(shadow_clip.z-shadow_clip.w)*2.0-1.0, 0.0);
+ }
+ else if (spos.z < -shadow_clip.y)
+ {
+ lpos = shadow_matrix[2]*spos;
+ lpos.xy *= shadow_res;
+ shadow = pcfShadow(shadowMap2, lpos, 0.5);
+ }
+ else if (spos.z < -shadow_clip.x)
+ {
+ lpos = shadow_matrix[1]*spos;
+ lpos.xy *= shadow_res;
+ shadow = pcfShadow(shadowMap1, lpos, 0.75);
+ }
+ else
+ {
+ lpos = shadow_matrix[0]*spos;
+ lpos.xy *= shadow_res;
+ shadow = pcfShadow(shadowMap0, lpos, 1.0);
+ }
+
+ // take the most-shadowed value out of these two:
+ // * the blurred sun shadow in the light (shadow) map
+ // * an unblurred dot product between the sun and this norm
+ // the goal is to err on the side of most-shadow to fill-in shadow holes and reduce artifacting
+ shadow = min(shadow, dp_directional_light);
+
+ //lpos.xy /= lpos.w*32.0;
+ //if (fract(lpos.x) < 0.1 || fract(lpos.y) < 0.1)
+ //{
+ // shadow = 0.0;
+ //}
+
+ }
+ }
+ else
+ {
+ // more distant than the shadow map covers
+ shadow = 1.0;
+ }
+
+ gl_FragColor[0] = shadow;
+ gl_FragColor[1] = calcAmbientOcclusion(pos, norm);
+
+ //spotlight shadow 1
+ vec4 lpos = shadow_matrix[4]*spos;
+ gl_FragColor[2] = pcfShadow(shadowMap4, lpos, 0.8).x;
+
+ //spotlight shadow 2
+ lpos = shadow_matrix[5]*spos;
+ gl_FragColor[3] = pcfShadow(shadowMap5, lpos, 0.8).x;
+
+ //gl_FragColor.rgb = pos.xyz;
+ //gl_FragColor.b = shadow;
+}
--
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