paint_utils.c

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#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];
        float mval_f[2];

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

        initgrabz(vc->rv3d, loc[0], loc[1], loc[2]);

        mval_f[0]= pixel_radius;
        mval_f[1]= 0.0f;
        ED_view3d_win_to_delta(vc->ar, mval_f, delta);

        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 = (0.35f*texres.tr + 0.45f*texres.tg + 0.2f*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, const int xy[2], float uv[2])
{
        DerivedMesh *dm = mesh_get_derived_final(scene, ob, CD_MASK_BAREMESH);
        const 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);
}

int imapaint_pick_face(ViewContext *vc, Mesh *me, const int mval[2], 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 *UNUSED(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.");
}