diff options
Diffstat (limited to 'indra/llprimitive/llgltfmaterial.cpp')
| -rw-r--r-- | indra/llprimitive/llgltfmaterial.cpp | 90 |
1 files changed, 76 insertions, 14 deletions
diff --git a/indra/llprimitive/llgltfmaterial.cpp b/indra/llprimitive/llgltfmaterial.cpp index b2cd1dc597..1c47001272 100644 --- a/indra/llprimitive/llgltfmaterial.cpp +++ b/indra/llprimitive/llgltfmaterial.cpp @@ -924,6 +924,25 @@ void LLGLTFMaterial::updateTextureTracking() // for material overrides editor will set it } +// Test cases: +// Case 1. +// Input: scale 1.0,1.0; Offset horizontal 0.0, Offset vertical 0.0 Rotation 0.349066; +// Expected output: scale 1.0,1.0; Offset horizontal 0.201, Offset vertical -0.141 Rotation -0.349066; +// Case 2. +// Input: scale 1.0,1.0; Offset horizontal 0.5, Offset vertical 0.1 Rotation 0; +// Expected output: scale 1.0,1.0; Offset horizontal 0.5, Offset vertical -0.1 Rotation -0; +// Case 3. +// Input: scale 1.0,1.0; Offset horizontal 0.1, Offset vertical 0.2 Rotation 0.349066; +// Expected output: scale 1.0,1.0; Offset horizontal 0.295, Offset vertical -0.345 Rotation -0.349066; +// Case 4. +// Input: scale 1.0,1.0; Offset horizontal 0.5, Offset vertical 0.0 Rotation 0.349066; +// Expected output: scale 1.0,1.0; Offset horizontal 0.701, Offset vertical -0.141 Rotation -0.349066; +// +// Legacy offsets are right to left and top to bottom. +// PBR offsets are right to left and bottom to top. +// +// Legacy rotation is relative to face's center counter clockwise, +// PBR rotation is relative to top-left corner, clockwise void LLGLTFMaterial::convertTextureTransformToPBR( F32 tex_scale_s, F32 tex_scale_t, @@ -935,22 +954,65 @@ void LLGLTFMaterial::convertTextureTransformToPBR( F32& pbr_rotation) { pbr_scale.set(tex_scale_s, tex_scale_t); - pbr_rotation = -(tex_rotation) / 2.f; - const F32 adjusted_offset_s = tex_offset_s; - const F32 adjusted_offset_t = -tex_offset_t; + pbr_rotation = -tex_rotation; + + // Center of the tile + const F32 center_s = 0.5f; + const F32 center_t = 0.5f; + + // Center adjustment for scale F32 center_adjust_s = 0.5f * (1.0f - tex_scale_s); F32 center_adjust_t = 0.5f * (1.0f - tex_scale_t); - if (pbr_rotation != 0.0f) - { - const F32 c = cosf(pbr_rotation); - const F32 s = sinf(pbr_rotation); - const F32 tmp_s = center_adjust_s * c - center_adjust_t * s; - const F32 tmp_t = center_adjust_s * s + center_adjust_t * c; - center_adjust_s = tmp_s; - center_adjust_t = tmp_t; - } + // 2. Offset from center + F32 pos_s = center_adjust_s - center_s; + F32 pos_t = center_adjust_t - center_t; + + // 3. Rotate around center (clockwise, as per GLTF spec) + F32 c = cosf(pbr_rotation); + F32 s = sinf(pbr_rotation); + F32 rot_s = pos_s * c + pos_t * s; + F32 rot_t = -pos_s * s + pos_t * c; + + // 4. Move back to top-left and apply offset + pbr_offset.set(rot_s + center_s + tex_offset_s, rot_t + center_t - tex_offset_t); +} + +// Convert PBR transform values back to legacy TE transform values. +// This is the reverse of convertTextureTransformToPBR. +void LLGLTFMaterial::convertPBRTransformToTexture( + const LLVector2& pbr_scale, + const LLVector2& pbr_offset, + F32 pbr_rotation, + F32& tex_scale_s, + F32& tex_scale_t, + F32& tex_offset_s, + F32& tex_offset_t, + F32& tex_rotation) +{ + tex_scale_s = pbr_scale.mV[0]; + tex_scale_t = pbr_scale.mV[1]; + tex_rotation = -pbr_rotation; + + // Center of the tile + const F32 center_s = 0.5f; + const F32 center_t = 0.5f; + + // Center adjustment for scale + F32 center_adjust_s = 0.5f * (1.0f - tex_scale_s); + F32 center_adjust_t = 0.5f * (1.0f - tex_scale_t); + + // 2. Offset from center + F32 pos_s = center_adjust_s - center_s; + F32 pos_t = center_adjust_t - center_t; + + // 3. Rotate around center (clockwise, as per GLTF spec) + F32 c = cosf(pbr_rotation); + F32 s = sinf(pbr_rotation); + F32 rot_s = pos_s * c + pos_t * s; + F32 rot_t = -pos_s * s + pos_t * c; - pbr_offset.set(adjusted_offset_s + center_adjust_s, - adjusted_offset_t + center_adjust_t); + // 3. Recover legacy offset + tex_offset_s = pbr_offset.mV[0] - rot_s - center_s; + tex_offset_t = -(pbr_offset.mV[1] - rot_t - center_t); } |