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Octahedral Normal/Tangent Compression

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Implementation of Octahedral normal compression into Godot 4.0
This commit is contained in:
Omar El Sheikh 2022-02-22 18:10:09 -05:00
parent f2a6168414
commit 78881b3cc3
7 changed files with 112 additions and 137 deletions
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18
servers/rendering/renderer_rd/shaders/scene_forward_clustered.glsl
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@ -15,11 +15,11 @@ layout(location = 0) in vec3 vertex_attrib;
//only for pure render depth when normal is not used
#ifdef NORMAL_USED
layout(location = 1) in vec3 normal_attrib;
layout(location = 1) in vec2 normal_attrib;
#endif
#if defined(TANGENT_USED) || defined(NORMAL_MAP_USED) || defined(LIGHT_ANISOTROPY_USED)
layout(location = 2) in vec4 tangent_attrib;
layout(location = 2) in vec2 tangent_attrib;
#endif
#if defined(COLOR_USED)
@ -58,6 +58,13 @@ layout(location = 10) in uvec4 bone_attrib;
layout(location = 11) in vec4 weight_attrib;
#endif
vec3 oct_to_vec3(vec2 e) {
vec3 v = vec3(e.xy, 1.0 - abs(e.x) - abs(e.y));
float t = max(-v.z, 0.0);
v.xy += t * -sign(v.xy);
return v;
}
/* Varyings */
layout(location = 0) out vec3 vertex_interp;
@ -231,12 +238,13 @@ void vertex_shader(in uint instance_index, in bool is_multimesh, in SceneData sc
vec3 vertex = vertex_attrib;
#ifdef NORMAL_USED
vec3 normal = normal_attrib * 2.0 - 1.0;
vec3 normal = oct_to_vec3(normal_attrib * 2.0 - 1.0);
#endif
#if defined(TANGENT_USED) || defined(NORMAL_MAP_USED) || defined(LIGHT_ANISOTROPY_USED)
vec3 tangent = tangent_attrib.xyz * 2.0 - 1.0;
float binormalf = tangent_attrib.a * 2.0 - 1.0;
vec2 signed_tangent_attrib = tangent_attrib * 2.0 - 1.0;
vec3 tangent = oct_to_vec3(vec2(signed_tangent_attrib.x, abs(signed_tangent_attrib.y) * 2.0 - 1.0));
float binormalf = sign(signed_tangent_attrib.y);
vec3 binormal = normalize(cross(normal, tangent) * binormalf);
#endif

18
servers/rendering/renderer_rd/shaders/scene_forward_mobile.glsl
View file

@ -16,11 +16,11 @@ layout(location = 0) in vec3 vertex_attrib;
//only for pure render depth when normal is not used
#ifdef NORMAL_USED
layout(location = 1) in vec3 normal_attrib;
layout(location = 1) in vec2 normal_attrib;
#endif
#if defined(TANGENT_USED) || defined(NORMAL_MAP_USED) || defined(LIGHT_ANISOTROPY_USED)
layout(location = 2) in vec4 tangent_attrib;
layout(location = 2) in vec2 tangent_attrib;
#endif
#if defined(COLOR_USED)
@ -59,6 +59,13 @@ layout(location = 10) in uvec4 bone_attrib;
layout(location = 11) in vec4 weight_attrib;
#endif
vec3 oct_to_vec3(vec2 e) {
vec3 v = vec3(e.xy, 1.0 - abs(e.x) - abs(e.y));
float t = max(-v.z, 0.0);
v.xy += t * -sign(v.xy);
return v;
}
/* Varyings */
layout(location = 0) highp out vec3 vertex_interp;
@ -229,12 +236,13 @@ void main() {
vec3 vertex = vertex_attrib;
#ifdef NORMAL_USED
vec3 normal = normal_attrib * 2.0 - 1.0;
vec3 normal = oct_to_vec3(normal_attrib * 2.0 - 1.0);
#endif
#if defined(TANGENT_USED) || defined(NORMAL_MAP_USED) || defined(LIGHT_ANISOTROPY_USED)
vec3 tangent = tangent_attrib.xyz * 2.0 - 1.0;
float binormalf = tangent_attrib.a * 2.0 - 1.0;
vec3 signed_tangent_attrib = tangent_attrib * 2.0 - 1.0;
vec3 tangent = oct_to_vec3(vec2(signed_tangent_attrib.x, abs(signed_tangent_attrib.y) * 2.0 - 1.0));
float binormalf = sign(signed_tangent_attrib.y);
vec3 binormal = normalize(cross(normal, tangent) * binormalf);
#endif