diff options
Diffstat (limited to 'source/blender/draw/modes/shaders/common_view_lib.glsl')
| -rw-r--r-- | source/blender/draw/modes/shaders/common_view_lib.glsl | 35 |
1 files changed, 19 insertions, 16 deletions
diff --git a/source/blender/draw/modes/shaders/common_view_lib.glsl b/source/blender/draw/modes/shaders/common_view_lib.glsl index bdf184cb31e..99410b41ce6 100644 --- a/source/blender/draw/modes/shaders/common_view_lib.glsl +++ b/source/blender/draw/modes/shaders/common_view_lib.glsl @@ -14,23 +14,26 @@ layout(std140) uniform viewBlock vec4 clipPlanes[2]; }; - /** Transform shortcuts. */ - /* Rule of thumb: Try to reuse world positions and normals because converting though viewspace - * will always be decomposed in at least 2 matrix operation. */ +uniform mat4 ModelMatrix; +uniform mat4 ModelMatrixInverse; - /** - * Some clarification: - * Usually Normal matrix is transpose(inverse(ViewMatrix * ModelMatrix)) - * - * But since it is slow to multiply matrices we decompose it. Decomposing - * inversion and transposition both invert the product order leaving us with - * the same original order: - * transpose(ViewMatrixInverse) * transpose(ModelMatrixInverse) - * - * Knowing that the view matrix is orthogonal, the transpose is also the inverse. - * Note: This is only valid because we are only using the mat3 of the ViewMatrixInverse. - * ViewMatrix * transpose(ModelMatrixInverse) - **/ +/** Transform shortcuts. */ +/* Rule of thumb: Try to reuse world positions and normals because converting though viewspace + * will always be decomposed in at least 2 matrix operation. */ + +/** + * Some clarification: + * Usually Normal matrix is transpose(inverse(ViewMatrix * ModelMatrix)) + * + * But since it is slow to multiply matrices we decompose it. Decomposing + * inversion and transposition both invert the product order leaving us with + * the same original order: + * transpose(ViewMatrixInverse) * transpose(ModelMatrixInverse) + * + * Knowing that the view matrix is orthogonal, the transpose is also the inverse. + * Note: This is only valid because we are only using the mat3 of the ViewMatrixInverse. + * ViewMatrix * transpose(ModelMatrixInverse) + **/ #define normal_object_to_view(n) (mat3(ViewMatrix) * (transpose(mat3(ModelMatrixInverse)) * n)) #define normal_object_to_world(n) (transpose(mat3(ModelMatrixInverse)) * n) #define normal_world_to_object(n) (transpose(mat3(ModelMatrix)) * n) |