blender-archive/source/blender/editors/sculpt_paint/paint_utils.c

#include <math.h>
#include <stdlib.h>

#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"

#include "DNA_scene_types.h"
#include "DNA_brush_types.h"

#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "BKE_brush.h"
#include "BKE_context.h"
#include "BKE_DerivedMesh.h"
#include "BKE_paint.h"

#include "RNA_access.h"
#include "RNA_define.h"

#include "BIF_gl.h"
/* TODO: remove once projectf goes away */
#include "BIF_glutil.h"

#include "RE_shader_ext.h"

#include "ED_view3d.h"
#include "ED_screen.h"

#include "BLO_sys_types.h"
#include "ED_mesh.h" /* for face mask functions */

#include "WM_api.h"
#include "WM_types.h"

#include "paint_intern.h"

/* convert a point in model coordinates to 2D screen coordinates */
/* TODO: can be deleted once all calls are replaced with
   view3d_project_float() */
void projectf(bglMats *mats, const float v[3], float p[2])
{
	double ux, uy, uz;

	gluProject(v[0],v[1],v[2], mats->modelview, mats->projection,
		   (GLint *)mats->viewport, &ux, &uy, &uz);
	p[0]= ux;
	p[1]= uy;
}

float paint_calc_object_space_radius(ViewContext *vc, float center[3],
				     float pixel_radius)
{
	Object *ob = vc->obact;
	float delta[3], scale, loc[3];

	mul_v3_m4v3(loc, ob->obmat, center);

	initgrabz(vc->rv3d, loc[0], loc[1], loc[2]);
	window_to_3d_delta(vc->ar, delta, pixel_radius, 0);

	scale= fabsf(mat4_to_scale(ob->obmat));
	scale= (scale == 0.0f)? 1.0f: scale;

	return len_v3(delta)/scale;
}

float paint_get_tex_pixel(Brush* br, float u, float v)
{
	TexResult texres;
	float co[3];
	int hasrgb;

	co[0] = u;
	co[1] = v;
	co[2] = 0;

	memset(&texres, 0, sizeof(TexResult));
	hasrgb = multitex_ext(br->mtex.tex, co, NULL, NULL, 0, &texres);

	if (hasrgb & TEX_RGB)
		texres.tin = (0.35*texres.tr + 0.45*texres.tg + 0.2*texres.tb)*texres.ta;

	return texres.tin;
}

/* 3D Paint */

static void imapaint_project(Object *ob, float *model, float *proj, float *co, float *pco)
{
	VECCOPY(pco, co);
	pco[3]= 1.0f;

	mul_m4_v3(ob->obmat, pco);
	mul_m4_v3((float(*)[4])model, pco);
	mul_m4_v4((float(*)[4])proj, pco);
}

static void imapaint_tri_weights(Object *ob, float *v1, float *v2, float *v3, float *co, float *w)
{
	float pv1[4], pv2[4], pv3[4], h[3], divw;
	float model[16], proj[16], wmat[3][3], invwmat[3][3];
	GLint view[4];

	/* compute barycentric coordinates */

	/* get the needed opengl matrices */
	glGetIntegerv(GL_VIEWPORT, view);
	glGetFloatv(GL_MODELVIEW_MATRIX, model);
	glGetFloatv(GL_PROJECTION_MATRIX, proj);
	view[0] = view[1] = 0;

	/* project the verts */
	imapaint_project(ob, model, proj, v1, pv1);
	imapaint_project(ob, model, proj, v2, pv2);
	imapaint_project(ob, model, proj, v3, pv3);

	/* do inverse view mapping, see gluProject man page */
	h[0]= (co[0] - view[0])*2.0f/view[2] - 1;
	h[1]= (co[1] - view[1])*2.0f/view[3] - 1;
	h[2]= 1.0f;

	/* solve for(w1,w2,w3)/perspdiv in:
	   h*perspdiv = Project*Model*(w1*v1 + w2*v2 + w3*v3) */

	wmat[0][0]= pv1[0];  wmat[1][0]= pv2[0];  wmat[2][0]= pv3[0];
	wmat[0][1]= pv1[1];  wmat[1][1]= pv2[1];  wmat[2][1]= pv3[1];
	wmat[0][2]= pv1[3];  wmat[1][2]= pv2[3];  wmat[2][2]= pv3[3];

	invert_m3_m3(invwmat, wmat);
	mul_m3_v3(invwmat, h);

	VECCOPY(w, h);

	/* w is still divided by perspdiv, make it sum to one */
	divw= w[0] + w[1] + w[2];
	if(divw != 0.0f)
		mul_v3_fl(w, 1.0f/divw);
}

/* compute uv coordinates of mouse in face */
void imapaint_pick_uv(Scene *scene, Object *ob, unsigned int faceindex, int *xy, float *uv)
{
	DerivedMesh *dm = mesh_get_derived_final(scene, ob, CD_MASK_BAREMESH);
	int *index = dm->getFaceDataArray(dm, CD_ORIGINDEX);
	MTFace *tface = dm->getFaceDataArray(dm, CD_MTFACE), *tf;
	int numfaces = dm->getNumFaces(dm), a, findex;
	float p[2], w[3], absw, minabsw;
	MFace mf;
	MVert mv[4];

	minabsw = 1e10;
	uv[0] = uv[1] = 0.0;

	/* test all faces in the derivedmesh with the original index of the picked face */
	for(a = 0; a < numfaces; a++) {
		findex= (index)? index[a]: a;

		if(findex == faceindex) {
			dm->getFace(dm, a, &mf);

			dm->getVert(dm, mf.v1, &mv[0]);
			dm->getVert(dm, mf.v2, &mv[1]);
			dm->getVert(dm, mf.v3, &mv[2]);
			if(mf.v4)
				dm->getVert(dm, mf.v4, &mv[3]);

			tf= &tface[a];

			p[0]= xy[0];
			p[1]= xy[1];

			if(mf.v4) {
				/* the triangle with the largest absolute values is the one
				   with the most negative weights */
				imapaint_tri_weights(ob, mv[0].co, mv[1].co, mv[3].co, p, w);
				absw= fabs(w[0]) + fabs(w[1]) + fabs(w[2]);
				if(absw < minabsw) {
					uv[0]= tf->uv[0][0]*w[0] + tf->uv[1][0]*w[1] + tf->uv[3][0]*w[2];
					uv[1]= tf->uv[0][1]*w[0] + tf->uv[1][1]*w[1] + tf->uv[3][1]*w[2];
					minabsw = absw;
				}

				imapaint_tri_weights(ob, mv[1].co, mv[2].co, mv[3].co, p, w);
				absw= fabs(w[0]) + fabs(w[1]) + fabs(w[2]);
				if(absw < minabsw) {
					uv[0]= tf->uv[1][0]*w[0] + tf->uv[2][0]*w[1] + tf->uv[3][0]*w[2];
					uv[1]= tf->uv[1][1]*w[0] + tf->uv[2][1]*w[1] + tf->uv[3][1]*w[2];
					minabsw = absw;
				}
			}
			else {
				imapaint_tri_weights(ob, mv[0].co, mv[1].co, mv[2].co, p, w);
				absw= fabs(w[0]) + fabs(w[1]) + fabs(w[2]);
				if(absw < minabsw) {
					uv[0]= tf->uv[0][0]*w[0] + tf->uv[1][0]*w[1] + tf->uv[2][0]*w[2];
					uv[1]= tf->uv[0][1]*w[0] + tf->uv[1][1]*w[1] + tf->uv[2][1]*w[2];
					minabsw = absw;
				}
			}
		}
	}

	dm->release(dm);
}

///* returns 0 if not found, otherwise 1 */
int imapaint_pick_face(ViewContext *vc, Mesh *me, int *mval, unsigned int *index)
{
	if(!me || me->totface==0)
		return 0;

	/* sample only on the exact position */
	*index = view3d_sample_backbuf(vc, mval[0], mval[1]);

	if((*index)<=0 || (*index)>(unsigned int)me->totface)
		return 0;

	(*index)--;
	
	return 1;
}

/* used for both 3d view and image window */
void paint_sample_color(Scene *scene, ARegion *ar, int x, int y)	/* frontbuf */
{
	Brush *br = paint_brush(paint_get_active(scene));
	unsigned int col;
	char *cp;

	CLAMP(x, 0, ar->winx);
	CLAMP(y, 0, ar->winy);
	
	glReadBuffer(GL_FRONT);
	glReadPixels(x+ar->winrct.xmin, y+ar->winrct.ymin, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &col);
	glReadBuffer(GL_BACK);

	cp = (char *)&col;
	
	if(br) {
		br->rgb[0]= cp[0]/255.0f;
		br->rgb[1]= cp[1]/255.0f;
		br->rgb[2]= cp[2]/255.0f;
	}
}

static int brush_curve_preset_exec(bContext *C, wmOperator *op)
{
	Brush *br = paint_brush(paint_get_active(CTX_data_scene(C)));
	brush_curve_preset(br, RNA_enum_get(op->ptr, "shape"));

	return OPERATOR_FINISHED;
}

static int brush_curve_preset_poll(bContext *C)
{
	Brush *br = paint_brush(paint_get_active(CTX_data_scene(C)));

	return br && br->curve;
}

void BRUSH_OT_curve_preset(wmOperatorType *ot)
{
	static EnumPropertyItem prop_shape_items[] = {
		{CURVE_PRESET_SHARP, "SHARP", 0, "Sharp", ""},
		{CURVE_PRESET_SMOOTH, "SMOOTH", 0, "Smooth", ""},
		{CURVE_PRESET_MAX, "MAX", 0, "Max", ""},
		{CURVE_PRESET_LINE, "LINE", 0, "Line", ""},
		{CURVE_PRESET_ROUND, "ROUND", 0, "Round", ""},
		{CURVE_PRESET_ROOT, "ROOT", 0, "Root", ""},
		{0, NULL, 0, NULL, NULL}};

	ot->name= "Preset";
	ot->description= "Set brush shape";
	ot->idname= "BRUSH_OT_curve_preset";

	ot->exec= brush_curve_preset_exec;
	ot->poll= brush_curve_preset_poll;

	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

	RNA_def_enum(ot->srna, "shape", prop_shape_items, CURVE_PRESET_SMOOTH, "Mode", "");
}


/* face-select ops */
static int paint_select_linked_exec(bContext *C, wmOperator *UNUSED(op))
{
	paintface_select_linked(C, CTX_data_active_object(C), NULL, 2);
	ED_region_tag_redraw(CTX_wm_region(C));
	return OPERATOR_FINISHED;
}

void PAINT_OT_face_select_linked(wmOperatorType *ot)
{
	ot->name= "Select Linked";
	ot->description= "Select linked faces";
	ot->idname= "PAINT_OT_face_select_linked";

	ot->exec= paint_select_linked_exec;
	ot->poll= facemask_paint_poll;

	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

static int paint_select_linked_pick_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
	int mode= RNA_boolean_get(op->ptr, "extend") ? 1:0;
	paintface_select_linked(C, CTX_data_active_object(C), event->mval, mode);
	ED_region_tag_redraw(CTX_wm_region(C));
	return OPERATOR_FINISHED;
}

void PAINT_OT_face_select_linked_pick(wmOperatorType *ot)
{
	ot->name= "Select Linked Pick";
	ot->description= "Select linked faces";
	ot->idname= "PAINT_OT_face_select_linked_pick";

	ot->invoke= paint_select_linked_pick_invoke;
	ot->poll= facemask_paint_poll;

	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

	RNA_def_boolean(ot->srna, "extend", 0, "Extend", "Extend the existing selection");
}


static int face_select_all_exec(bContext *C, wmOperator *op)
{
	Object *ob= CTX_data_active_object(C);
	paintface_deselect_all_visible(ob, RNA_enum_get(op->ptr, "action"), TRUE);
	ED_region_tag_redraw(CTX_wm_region(C));
	return OPERATOR_FINISHED;
}


void PAINT_OT_face_select_all(wmOperatorType *ot)
{
	ot->name= "Face Selection";
	ot->description= "Change selection for all faces";
	ot->idname= "PAINT_OT_face_select_all";

	ot->exec= face_select_all_exec;
	ot->poll= facemask_paint_poll;

	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

	WM_operator_properties_select_all(ot);
}

static int face_select_inverse_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob= CTX_data_active_object(C);
	paintface_deselect_all_visible(ob, SEL_INVERT, TRUE);
	ED_region_tag_redraw(CTX_wm_region(C));
	return OPERATOR_FINISHED;
}


void PAINT_OT_face_select_inverse(wmOperatorType *ot)
{
	ot->name= "Face Select Invert";
	ot->description= "Invert selection of faces";
	ot->idname= "PAINT_OT_face_select_inverse";

	ot->exec= face_select_inverse_exec;
	ot->poll= facemask_paint_poll;

	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

static int face_select_hide_exec(bContext *C, wmOperator *op)
{
	const int unselected= RNA_boolean_get(op->ptr, "unselected");
	Object *ob= CTX_data_active_object(C);
	paintface_hide(ob, unselected);
	ED_region_tag_redraw(CTX_wm_region(C));
	return OPERATOR_FINISHED;
}

void PAINT_OT_face_select_hide(wmOperatorType *ot)
{
	ot->name= "Face Select Hide";
	ot->description= "Hide selected faces";
	ot->idname= "PAINT_OT_face_select_hide";

	ot->exec= face_select_hide_exec;
	ot->poll= facemask_paint_poll;

	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

	RNA_def_boolean(ot->srna, "unselected", 0, "Unselected", "Hide unselected rather than selected objects.");
}

static int face_select_reveal_exec(bContext *C, wmOperator *op)
{
	Object *ob= CTX_data_active_object(C);
	paintface_reveal(ob);
	ED_region_tag_redraw(CTX_wm_region(C));
	return OPERATOR_FINISHED;
}

void PAINT_OT_face_select_reveal(wmOperatorType *ot)
{
	ot->name= "Face Select Reveal";
	ot->description= "Reveal hidden faces";
	ot->idname= "PAINT_OT_face_select_reveal";

	ot->exec= face_select_reveal_exec;
	ot->poll= facemask_paint_poll;

	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

	RNA_def_boolean(ot->srna, "unselected", 0, "Unselected", "Hide unselected rather than selected objects.");
}