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HDR pipeline: Use MRT to prefilter the environment map

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This commit is contained in:
Fernando García Liñán 2021-07-26 17:12:49 +02:00
parent 873ae6b3d5
commit 016585e176
10 changed files with 90 additions and 143 deletions
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2
Compositor/HDR/csm-pass.xml
View file

@ -6,7 +6,7 @@
<effect-scheme>hdr-shadow</effect-scheme>
<clear-mask>depth</clear-mask>
<!-- Only render objects with the CAST_SHADOW bit flag -->
<cull-mask>0x000004</cull-mask>
<cull-mask>0x4</cull-mask>
<render-at-night>false</render-at-night>
<attachment>
<buffer>sun-shadowmap-atlas</buffer>

3
Compositor/HDR/env-capture-pass.xml
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@ -3,10 +3,9 @@
<PropertyList>
<type>scene</type>
<effect-scheme>hdr-envmap</effect-scheme>
<clear-mask>depth</clear-mask>
<!-- Only render the skydome and terrain -->
<!-- TODO: Explicitly select the LOD level -->
<cull-mask>0x801</cull-mask>
<cull-mask>0x800</cull-mask>
<binding>
<unit>11</unit>
<buffer>sky-view</buffer>

5
Compositor/HDR/env-prefilter1-pass.xml
View file

@ -1,5 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<PropertyList include="env-prefilter-pass.xml">
<effect>Effects/HDR/envmap-prefilter1</effect>
</PropertyList>

5
Compositor/HDR/env-prefilter2-pass.xml
View file

@ -1,5 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<PropertyList include="env-prefilter-pass.xml">
<effect>Effects/HDR/envmap-prefilter2</effect>
</PropertyList>

5
Compositor/HDR/env-prefilter3-pass.xml
View file

@ -1,5 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<PropertyList include="env-prefilter-pass.xml">
<effect>Effects/HDR/envmap-prefilter3</effect>
</PropertyList>

5
Compositor/HDR/env-prefilter4-pass.xml
View file

@ -1,5 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<PropertyList include="env-prefilter-pass.xml">
<effect>Effects/HDR/envmap-prefilter4</effect>
</PropertyList>

144
Compositor/HDR/hdr.xml
View file

@ -315,244 +315,164 @@
Diffuse lighting is approximated by using the highest mipmap level
(roughness=1).
-->
<pass include="env-prefilter1-pass.xml">
<name>env-prefilter1-0</name>
<cubemap-face>0</cubemap-face>
<pass include="env-prefilter-pass.xml">
<name>env-prefilter1</name>
<effect>Effects/HDR/envmap-prefilter1</effect>
<attachment>
<component>color0</component>
<buffer>envmap</buffer>
<face>0</face>
<level>1</level>
</attachment>
</pass>
<pass include="env-prefilter1-pass.xml">
<name>env-prefilter1-1</name>
<cubemap-face>1</cubemap-face>
<attachment>
<component>color0</component>
<component>color1</component>
<buffer>envmap</buffer>
<face>1</face>
<level>1</level>
</attachment>
</pass>
<pass include="env-prefilter1-pass.xml">
<name>env-prefilter1-2</name>
<cubemap-face>2</cubemap-face>
<attachment>
<component>color0</component>
<component>color2</component>
<buffer>envmap</buffer>
<face>2</face>
<level>1</level>
</attachment>
</pass>
<pass include="env-prefilter1-pass.xml">
<name>env-prefilter1-3</name>
<cubemap-face>3</cubemap-face>
<attachment>
<component>color0</component>
<component>color3</component>
<buffer>envmap</buffer>
<face>3</face>
<level>1</level>
</attachment>
</pass>
<pass include="env-prefilter1-pass.xml">
<name>env-prefilter1-4</name>
<cubemap-face>4</cubemap-face>
<attachment>
<component>color0</component>
<component>color4</component>
<buffer>envmap</buffer>
<face>4</face>
<level>1</level>
</attachment>
</pass>
<pass include="env-prefilter1-pass.xml">
<name>env-prefilter1-5</name>
<cubemap-face>5</cubemap-face>
<attachment>
<component>color0</component>
<component>color5</component>
<buffer>envmap</buffer>
<face>5</face>
<level>1</level>
</attachment>
</pass>
<pass include="env-prefilter2-pass.xml">
<name>env-prefilter2-0</name>
<cubemap-face>0</cubemap-face>
<pass include="env-prefilter-pass.xml">
<name>env-prefilter2</name>
<effect>Effects/HDR/envmap-prefilter2</effect>
<attachment>
<component>color0</component>
<buffer>envmap</buffer>
<face>0</face>
<level>2</level>
</attachment>
</pass>
<pass include="env-prefilter2-pass.xml">
<name>env-prefilter2-1</name>
<cubemap-face>1</cubemap-face>
<attachment>
<component>color0</component>
<component>color1</component>
<buffer>envmap</buffer>
<face>1</face>
<level>2</level>
</attachment>
</pass>
<pass include="env-prefilter2-pass.xml">
<name>env-prefilter2-2</name>
<cubemap-face>2</cubemap-face>
<attachment>
<component>color0</component>
<component>color2</component>
<buffer>envmap</buffer>
<face>2</face>
<level>2</level>
</attachment>
</pass>
<pass include="env-prefilter2-pass.xml">
<name>env-prefilter2-3</name>
<cubemap-face>3</cubemap-face>
<attachment>
<component>color0</component>
<component>color3</component>
<buffer>envmap</buffer>
<face>3</face>
<level>2</level>
</attachment>
</pass>
<pass include="env-prefilter2-pass.xml">
<name>env-prefilter2-4</name>
<cubemap-face>4</cubemap-face>
<attachment>
<component>color0</component>
<component>color4</component>
<buffer>envmap</buffer>
<face>4</face>
<level>2</level>
</attachment>
</pass>
<pass include="env-prefilter2-pass.xml">
<name>env-prefilter2-5</name>
<cubemap-face>5</cubemap-face>
<attachment>
<component>color0</component>
<component>color5</component>
<buffer>envmap</buffer>
<face>5</face>
<level>2</level>
</attachment>
</pass>
<pass include="env-prefilter3-pass.xml">
<name>env-prefilter3-0</name>
<cubemap-face>0</cubemap-face>
<pass include="env-prefilter-pass.xml">
<name>env-prefilter3</name>
<effect>Effects/HDR/envmap-prefilter3</effect>
<attachment>
<component>color0</component>
<buffer>envmap</buffer>
<face>0</face>
<level>3</level>
</attachment>
</pass>
<pass include="env-prefilter3-pass.xml">
<name>env-prefilter3-1</name>
<cubemap-face>1</cubemap-face>
<attachment>
<component>color0</component>
<component>color1</component>
<buffer>envmap</buffer>
<face>1</face>
<level>3</level>
</attachment>
</pass>
<pass include="env-prefilter3-pass.xml">
<name>env-prefilter3-2</name>
<cubemap-face>2</cubemap-face>
<attachment>
<component>color0</component>
<component>color2</component>
<buffer>envmap</buffer>
<face>2</face>
<level>3</level>
</attachment>
</pass>
<pass include="env-prefilter3-pass.xml">
<name>env-prefilter3-3</name>
<cubemap-face>3</cubemap-face>
<attachment>
<component>color0</component>
<component>color3</component>
<buffer>envmap</buffer>
<face>3</face>
<level>3</level>
</attachment>
</pass>
<pass include="env-prefilter3-pass.xml">
<name>env-prefilter3-4</name>
<cubemap-face>4</cubemap-face>
<attachment>
<component>color0</component>
<component>color4</component>
<buffer>envmap</buffer>
<face>4</face>
<level>3</level>
</attachment>
</pass>
<pass include="env-prefilter3-pass.xml">
<name>env-prefilter3-5</name>
<cubemap-face>5</cubemap-face>
<attachment>
<component>color0</component>
<component>color5</component>
<buffer>envmap</buffer>
<face>5</face>
<level>3</level>
</attachment>
</pass>
<pass include="env-prefilter4-pass.xml">
<name>env-prefilter4-0</name>
<cubemap-face>0</cubemap-face>
<pass include="env-prefilter-pass.xml">
<name>env-prefilter4</name>
<effect>Effects/HDR/envmap-prefilter4</effect>
<attachment>
<component>color0</component>
<buffer>envmap</buffer>
<face>0</face>
<level>4</level>
</attachment>
</pass>
<pass include="env-prefilter4-pass.xml">
<name>env-prefilter4-1</name>
<cubemap-face>1</cubemap-face>
<attachment>
<component>color0</component>
<component>color1</component>
<buffer>envmap</buffer>
<face>1</face>
<level>4</level>
</attachment>
</pass>
<pass include="env-prefilter4-pass.xml">
<name>env-prefilter4-2</name>
<cubemap-face>2</cubemap-face>
<attachment>
<component>color0</component>
<component>color2</component>
<buffer>envmap</buffer>
<face>2</face>
<level>4</level>
</attachment>
</pass>
<pass include="env-prefilter4-pass.xml">
<name>env-prefilter4-3</name>
<cubemap-face>3</cubemap-face>
<attachment>
<component>color0</component>
<component>color3</component>
<buffer>envmap</buffer>
<face>3</face>
<level>4</level>
</attachment>
</pass>
<pass include="env-prefilter4-pass.xml">
<name>env-prefilter4-4</name>
<cubemap-face>4</cubemap-face>
<attachment>
<component>color0</component>
<component>color4</component>
<buffer>envmap</buffer>
<face>4</face>
<level>4</level>
</attachment>
</pass>
<pass include="env-prefilter4-pass.xml">
<name>env-prefilter4-5</name>
<cubemap-face>5</cubemap-face>
<attachment>
<component>color0</component>
<component>color5</component>
<buffer>envmap</buffer>
<face>5</face>
<level>4</level>

2
Effects/HDR/envmap-prefilter.eff
View file

@ -7,7 +7,7 @@
<technique n="1">
<pass>
<program>
<vertex-shader>Shaders/HDR/trivial-cubemap.vert</vertex-shader>
<vertex-shader>Shaders/HDR/envmap-prefilter.vert</vertex-shader>
<fragment-shader>Shaders/HDR/envmap-prefilter.frag</fragment-shader>
</program>
<uniform>

33
Shaders/HDR/envmap-prefilter.frag
View file

@ -1,8 +1,18 @@
#version 330 core
out vec3 fragColor;
layout(location = 0) out vec3 fragColor0;
layout(location = 1) out vec3 fragColor1;
layout(location = 2) out vec3 fragColor2;
layout(location = 3) out vec3 fragColor3;
layout(location = 4) out vec3 fragColor4;
layout(location = 5) out vec3 fragColor5;
in vec3 cubemapCoord;
in vec3 cubemapCoord0;
in vec3 cubemapCoord1;
in vec3 cubemapCoord2;
in vec3 cubemapCoord3;
in vec3 cubemapCoord4;
in vec3 cubemapCoord5;
uniform samplerCube envmap;
uniform float roughness;
@ -10,6 +20,7 @@ uniform float roughness;
uniform int fg_CubemapFace;
const float PI = 3.14159265359;
const uint NUM_SAMPLES = 64u;
float RadicalInverse_VdC(uint bits)
{
@ -47,14 +58,13 @@ vec3 ImportanceSampleGGX(vec2 Xi, vec3 n, float r)
return normalize(sampleVec);
}
void main()
vec3 prefilter(vec3 n)
{
vec3 n = normalize(cubemapCoord);
n = normalize(n);
vec3 v = n; // n = v simplification
vec3 prefilteredColor = vec3(0.0);
float totalWeight = 0.0;
const uint NUM_SAMPLES = 1024u;
for (uint i = 0u; i < NUM_SAMPLES; ++i) {
vec2 Xi = Hammersley(i, NUM_SAMPLES);
@ -69,6 +79,15 @@ void main()
}
prefilteredColor /= totalWeight;
fragColor = prefilteredColor;
return prefilteredColor;
}
void main()
{
fragColor0 = prefilter(cubemapCoord0);
fragColor1 = prefilter(cubemapCoord1);
fragColor2 = prefilter(cubemapCoord2);
fragColor3 = prefilter(cubemapCoord3);
fragColor4 = prefilter(cubemapCoord4);
fragColor5 = prefilter(cubemapCoord5);
}

29
Shaders/HDR/envmap-prefilter.vert Normal file
View file

@ -0,0 +1,29 @@
#version 330 core
layout(location = 0) in vec4 pos;
layout(location = 3) in vec4 multiTexCoord0;
out vec3 cubemapCoord0;
out vec3 cubemapCoord1;
out vec3 cubemapCoord2;
out vec3 cubemapCoord3;
out vec3 cubemapCoord4;
out vec3 cubemapCoord5;
uniform mat4 osg_ModelViewProjectionMatrix;
void main()
{
gl_Position = osg_ModelViewProjectionMatrix * pos;
vec2 texCoord = multiTexCoord0.xy * 2.0 - 1.0;
// Map the quad texture coordinates to a direction vector to sample
// the cubemap. This assumes that we are using the weird left-handed
// orientations given by the OpenGL spec.
// See https://www.khronos.org/opengl/wiki/Cubemap_Texture#Upload_and_orientation
cubemapCoord0 = vec3(1.0, -texCoord.y, -texCoord.x);
cubemapCoord1 = vec3(-1.0, -texCoord.y, texCoord.x);
cubemapCoord2 = vec3(texCoord.x, 1.0, texCoord.y);
cubemapCoord3 = vec3(texCoord.x, -1.0, -texCoord.y);
cubemapCoord4 = vec3(texCoord.x, -texCoord.y, 1.0);
cubemapCoord5 = vec3(-texCoord.x, -texCoord.y, -1.0);
}