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Fix Blend Shapes when Octahedral Compression is Used 

Blend shapes did not take into account octahedral compressed vertex
attribute layouts and this resulted in incorrect lighting on the
resulting blended mesh

Now make the blend_shapes shader octahedral compression aware!
This commit is contained in:
Omar El Sheikh 2021-12-22 10:00:12 -05:00
parent f2ddafd860
commit 50ed674ec2
3 changed files with 38 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gles3/rasterizer_scene_gles3.cpp
View File

@ -1268,6 +1268,8 @@ void RasterizerSceneGLES3::_setup_geometry(RenderList::Element *e, const Transfo
if (s->blend_shapes.size() && e->instance->blend_values.size()) {
//blend shapes, use transform feedback
storage->mesh_render_blend_shapes(s, e->instance->blend_values.read().ptr());
//disable octahedral compression as the result of blend shapes is always uncompressed cartesian coordinates
state.scene_shader.set_conditional(SceneShaderGLES3::ENABLE_OCTAHEDRAL_COMPRESSION, false);
//rebind shader
state.scene_shader.bind();
#ifdef DEBUG_ENABLED

1
drivers/gles3/rasterizer_storage_gles3.cpp
View File

@ -4300,6 +4300,7 @@ void RasterizerStorageGLES3::mesh_render_blend_shapes(Surface *s, const float *p
shaders.blend_shapes.set_conditional(BlendShapeShaderGLES3::ENABLE_BLEND, false); //first pass does not blend
shaders.blend_shapes.set_conditional(BlendShapeShaderGLES3::USE_2D_VERTEX, s->format & VS::ARRAY_FLAG_USE_2D_VERTICES); //use 2D vertices if needed
shaders.blend_shapes.set_conditional(BlendShapeShaderGLES3::ENABLE_OCTAHEDRAL_COMPRESSION, s->format & VS::ARRAY_FLAG_USE_OCTAHEDRAL_COMPRESSION); //use octahedral normal compression
shaders.blend_shapes.bind();

37
drivers/gles3/shaders/blend_shape.glsl
View File

@ -25,11 +25,19 @@ ARRAY_INDEX=8,
layout(location = 0) in highp VFORMAT vertex_attrib;
/* clang-format on */
#ifdef ENABLE_OCTAHEDRAL_COMPRESSION
layout(location = 2) in vec4 normal_tangent_attrib;
#else
layout(location = 1) in vec3 normal_attrib;
#endif
#ifdef ENABLE_TANGENT
#ifdef ENABLE_OCTAHEDRAL_COMPRESSION
// packed into normal_attrib zw component
#else
layout(location = 2) in vec4 tangent_attrib;
#endif
#endif
#ifdef ENABLE_COLOR
layout(location = 3) in vec4 color_attrib;
@ -109,20 +117,37 @@ out vec4 weight_out; //tfb:ENABLE_SKELETON
uniform float blend_amount;
#ifdef ENABLE_OCTAHEDRAL_COMPRESSION
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 normalize(v);
}
#endif
void main() {
#ifdef ENABLE_BLEND
vertex_out = vertex_attrib_blend + vertex_attrib * blend_amount;
#ifdef ENABLE_NORMAL
#ifdef ENABLE_OCTAHEDRAL_COMPRESSION
normal_out = normal_attrib_blend + oct_to_vec3(normal_tangent_attrib.xy) * blend_amount;
#else
normal_out = normal_attrib_blend + normal_attrib * blend_amount;
#endif
#endif
#ifdef ENABLE_TANGENT
#ifdef ENABLE_OCTAHEDRAL_COMPRESSION
tangent_out.xyz = tangent_attrib_blend.xyz + oct_to_vec3(vec2(normal_tangent_attrib.z, abs(normal_tangent_attrib.w) * 2.0 - 1.0)) * blend_amount;
tangent_out.w = sign(tangent_attrib_blend.w);
#else
tangent_out.xyz = tangent_attrib_blend.xyz + tangent_attrib.xyz * blend_amount;
tangent_out.w = tangent_attrib_blend.w; //just copy, no point in blending his
#endif
#endif
#ifdef ENABLE_COLOR
@ -150,14 +175,22 @@ void main() {
vertex_out = vertex_attrib * blend_amount;
#ifdef ENABLE_NORMAL
#ifdef ENABLE_OCTAHEDRAL_COMPRESSION
normal_out = oct_to_vec3(normal_tangent_attrib.xy) * blend_amount;
#else
normal_out = normal_attrib * blend_amount;
#endif
#endif
#ifdef ENABLE_TANGENT
#ifdef ENABLE_OCTAHEDRAL_COMPRESSION
tangent_out.xyz = oct_to_vec3(vec2(normal_tangent_attrib.z, abs(normal_tangent_attrib.w) * 2.0 - 1.0)) * blend_amount;
tangent_out.w = sign(normal_tangent_attrib.w);
#else
tangent_out.xyz = tangent_attrib.xyz * blend_amount;
tangent_out.w = tangent_attrib.w; //just copy, no point in blending his
#endif
#endif
#ifdef ENABLE_COLOR