GPU_matrix: Add GPU_matrix_unproject_precalc

Pre-calculates values needed for unprojecting to avoid
a matrix invert and extracting projection matrix dimensions for
every call to GPU_matrix_unproject.

Use for gizmo selection drawing.

1 files changed, 24 insertions, 7 deletions

diff --git a/source/blender/gpu/GPU_matrix.h b/source/blender/gpu/GPU_matrix.h
index 6f7d25dafa7..61622c40ff0 100644
--- a/source/blender/gpu/GPU_matrix.h
+++ b/source/blender/gpu/GPU_matrix.h
@@ -96,21 +96,38 @@ void GPU_matrix_perspective_set(float fovy, float aspect, float near, float far)
 
 /* 3D Projection between Window and World Space */
 
+struct GPUMatrixUnproject_Precalc {
+  float model_inverted[4][4];
+  float view[4];
+  bool is_persp;
+  /** Result of 'projmat_dimensions'. */
+  struct {
+    float xmin, xmax;
+    float ymin, ymax;
+    float zmin, zmax;
+  } dims;
+};
+
+bool GPU_matrix_unproject_precalc(struct GPUMatrixUnproject_Precalc *unproj_precalc,
+                                  const float model[4][4],
+                                  const float proj[4][4],
+                                  const int view[4]);
+
 void GPU_matrix_project(const float world[3],
                         const float model[4][4],
                         const float proj[4][4],
                         const int view[4],
-                        float win[3]);
+                        float r_win[3]);
+
 bool GPU_matrix_unproject(const float win[3],
                           const float model[4][4],
                           const float proj[4][4],
                           const int view[4],
-                          float world[3]);
-void GPU_matrix_unproject_model_inverted(const float win[3],
-                                         const float model_inverted[4][4],
-                                         const float proj[4][4],
-                                         const int view[4],
-                                         float world[3]);
+                          float r_world[3]);
+
+void GPU_matrix_unproject_with_precalc(const struct GPUMatrixUnproject_Precalc *unproj_precalc,
+                                       const float win[3],
+                                       float r_world[3]);
 
 /* 2D Projection Matrix */