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Implement Octahedral on OpenGL3

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This commit is contained in:
Omar El Sheikh 2022-08-13 10:20:14 -07:00
parent 78881b3cc3
commit f1fda97c33
2 changed files with 23 additions and 16 deletions
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22
drivers/gles3/shaders/scene.glsl
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@ -35,8 +35,8 @@ USE_RADIANCE_MAP = true
/*
from RenderingServer:
ARRAY_VERTEX = 0, // RG32F or RGB32F (depending on 2D bit)
ARRAY_NORMAL = 1, // A2B10G10R10, A is ignored.
ARRAY_TANGENT = 2, // A2B10G10R10, A flips sign of binormal.
ARRAY_NORMAL = 1, // RG16 octahedral compression
ARRAY_TANGENT = 2, // RG16 octahedral compression, sign stored in sign of G
ARRAY_COLOR = 3, // RGBA8
ARRAY_TEX_UV = 4, // RG32F
ARRAY_TEX_UV2 = 5, // RG32F
@ -54,11 +54,11 @@ layout(location = 0) in highp vec3 vertex_attrib;
/* clang-format on */
#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)
@ -97,6 +97,13 @@ 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;
}
#ifdef USE_INSTANCING
layout(location = 12) in highp vec4 instance_xform0;
layout(location = 13) in highp vec4 instance_xform1;
@ -209,13 +216,14 @@ void main() {
#endif
#ifdef NORMAL_USED
vec3 normal = normal_attrib * 2.0 - 1.0;
vec3 normal = oct_to_vec3(normal_attrib * 2.0 - 1.0);
#endif
highp mat3 model_normal_matrix = mat3(model_matrix);
#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

17
drivers/gles3/storage/mesh_storage.cpp
View file

@ -124,11 +124,11 @@ void MeshStorage::mesh_add_surface(RID p_mesh, const RS::SurfaceData &p_surface)
} break;
case RS::ARRAY_NORMAL: {
stride += sizeof(int32_t);
stride += sizeof(uint16_t) * 2;
} break;
case RS::ARRAY_TANGENT: {
stride += sizeof(int32_t);
stride += sizeof(uint16_t) * 2;
} break;
case RS::ARRAY_COLOR: {
@ -595,17 +595,16 @@ void MeshStorage::_mesh_surface_generate_version_for_input_mask(Mesh::Surface::V
} break;
case RS::ARRAY_NORMAL: {
attribs[i].offset = vertex_stride;
// Will need to change to accommodate octahedral compression
attribs[i].size = 4;
attribs[i].type = GL_UNSIGNED_INT_2_10_10_10_REV;
vertex_stride += sizeof(float);
attribs[i].size = 2;
attribs[i].type = GL_UNSIGNED_SHORT;
vertex_stride += sizeof(uint16_t) * 2;
attribs[i].normalized = GL_TRUE;
} break;
case RS::ARRAY_TANGENT: {
attribs[i].offset = vertex_stride;
attribs[i].size = 4;
attribs[i].type = GL_UNSIGNED_INT_2_10_10_10_REV;
vertex_stride += sizeof(float);
attribs[i].size = 2;
attribs[i].type = GL_UNSIGNED_SHORT;
vertex_stride += sizeof(uint16_t) * 2;
attribs[i].normalized = GL_TRUE;
} break;
case RS::ARRAY_COLOR: {