From 1fea6220a2418b07bec8bbf49da00cc77094076f Mon Sep 17 00:00:00 2001
From: Antony Riakiotakis <kalast@gmail.com>
Date: Sun, 31 Mar 2013 00:38:50 +0000
Subject: Woot woot commit.

Stencil style texture mapping. Ready for field testing and user feedback.

This commit adds stencil like brushes, like those that existed on old ptex branch.
(with the exception of clip colour)
To control the position of the stencil, you use

Q: translation
Shift - Q: scaling
Ctrl - Q: rotation

There's extra work that has been done to make this work:

* Support for coloured overlay in vertex/texture painting
* Also made A button do stroke mode selection like in sculpt mode,
when mask painting is inactive.

There are some TODOs to work on during bcon3:

* Support tiled and stencil mode in 2D painting. Support alpha textures also.
* Tidy up overlay code. There's some confusion there due
to the way we use the primary brush texture sometimes for alpha, other times
for colour control.

WIP design docs will be in

http://wiki.blender.org/index.php/User:Psy-Fi/New_Brush_Tool_Design
---
 source/blender/blenkernel/intern/brush.c | 52 ++++++++++++++++++++++++++++----
 1 file changed, 46 insertions(+), 6 deletions(-)

(limited to 'source/blender/blenkernel/intern/brush.c')

diff --git a/source/blender/blenkernel/intern/brush.c b/source/blender/blenkernel/intern/brush.c
index 2f666bf5922..6dcd394c92a 100644
--- a/source/blender/blenkernel/intern/brush.c
+++ b/source/blender/blenkernel/intern/brush.c
@@ -121,6 +121,12 @@ static void brush_defaults(Brush *brush)
 	brush->sub_col[0] = 0.39; /* subtract mode color is light blue */
 	brush->sub_col[1] = 0.39;
 	brush->sub_col[2] = 1.00;
+
+	brush->stencil_pos[0] = 256;
+	brush->stencil_pos[1] = 256;
+
+	brush->stencil_dimension[0] = 256;
+	brush->stencil_dimension[1] = 256;
 }
 
 /* Datablock add/copy/free/make_local */
@@ -518,11 +524,45 @@ float BKE_brush_sample_tex_3D(const Scene *scene, Brush *br,
 		hasrgb = externtex(mtex, point, &intensity,
 		                   rgba, rgba + 1, rgba + 2, rgba + 3, thread, pool);
 	}
+	else if (mtex->brush_map_mode == MTEX_MAP_MODE_STENCIL) {
+		float rotation = -mtex->rot;
+		float point_2d[2] = {point[0], point[1]};
+		float x = 0.0f, y = 0.0f; /* Quite warnings */
+		float co[3];
+
+		x = point_2d[0] - br->stencil_pos[0];
+		y = point_2d[1] - br->stencil_pos[1];
+
+		if (rotation > 0.001f || rotation < -0.001f) {
+			const float angle    = atan2f(y, x) + rotation;
+			const float flen     = sqrtf(x * x + y * y);
+
+			x = flen * cosf(angle);
+			y = flen * sinf(angle);
+		}
+
+		if (fabs(x) > br->stencil_dimension[0] || fabs(y) > br->stencil_dimension[1]) {
+			rgba[0] = rgba[1] = rgba[2] = rgba[3] = 0.0;
+			return 0.0;
+		}
+		x /= (br->stencil_dimension[0]);
+		y /= (br->stencil_dimension[1]);
+
+		x *= br->mtex.size[0];
+		y *= br->mtex.size[1];
+
+		co[0] = x + br->mtex.ofs[0];
+		co[1] = y + br->mtex.ofs[1];
+		co[2] = 0.0f;
+
+		hasrgb = externtex(mtex, co, &intensity,
+		                   rgba, rgba + 1, rgba + 2, rgba + 3, thread, pool);
+	}
 	else {
 		float rotation = -mtex->rot;
 		float point_2d[2] = {point[0], point[1]};
 		float x = 0.0f, y = 0.0f; /* Quite warnings */
-		float radius = 1.0f; /* Quite warnings */
+		float invradius = 1.0f; /* Quite warnings */
 		float co[3];
 
 		if (mtex->brush_map_mode == MTEX_MAP_MODE_VIEW) {
@@ -534,13 +574,13 @@ float BKE_brush_sample_tex_3D(const Scene *scene, Brush *br,
 			y = point_2d[1] - ups->tex_mouse[1];
 
 			/* use pressure adjusted size for fixed mode */
-			radius = ups->pixel_radius;
+			invradius = 1.0/ups->pixel_radius;
 		}
 		else if (mtex->brush_map_mode == MTEX_MAP_MODE_TILED) {
 			/* leave the coordinates relative to the screen */
 
 			/* use unadjusted size for tiled mode */
-			radius = BKE_brush_size_get(scene, br);
+			invradius = 1.0/BKE_brush_size_get(scene, br);
 
 			x = point_2d[0];
 			y = point_2d[1];
@@ -551,11 +591,11 @@ float BKE_brush_sample_tex_3D(const Scene *scene, Brush *br,
 			x = point_2d[0] - ups->tex_mouse[0];
 			y = point_2d[1] - ups->tex_mouse[1];
 
-			radius = ups->pixel_radius;
+			invradius = 1.0/ups->pixel_radius;
 		}
 
-		x /= radius;
-		y /= radius;
+		x *= invradius;
+		y *= invradius;
 
 		/* it is probably worth optimizing for those cases where
 		 * the texture is not rotated by skipping the calls to
-- 
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