[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [15625] branches/soc-2008-unclezeiv/source /blender/render/intern/source/lightcuts.c: Textured area lights: completed support to textures, now allowing multiple channels, stencil, offset/size, etc.

[Davide Vercelli]

Revision: 15625
          http://projects.blender.org/plugins/scmsvn/viewcvs.php?view=rev&root=bf-blender&revision=15625
Author:   unclezeiv
Date:     2008-07-18 21:03:50 +0200 (Fri, 18 Jul 2008)

Log Message:
-----------
Textured area lights: completed support to textures, now allowing multiple channels, stencil, offset/size, etc.

Modified Paths:
--------------
    branches/soc-2008-unclezeiv/source/blender/render/intern/source/lightcuts.c

Modified: branches/soc-2008-unclezeiv/source/blender/render/intern/source/lightcuts.c
===================================================================
--- branches/soc-2008-unclezeiv/source/blender/render/intern/source/lightcuts.c	2008-07-18 17:57:34 UTC (rev 15624)
+++ branches/soc-2008-unclezeiv/source/blender/render/intern/source/lightcuts.c	2008-07-18 19:03:50 UTC (rev 15625)
@@ -43,6 +43,7 @@
 #include "PIL_time.h"
 #include "RE_pipeline.h"
 #include "RE_raytrace.h"
+#include "RE_render_ext.h"
 
 #include "blendef.h"
 #include "pixelshading.h"
@@ -674,6 +675,98 @@
 	}
 }
 
+/*
+ * TODO: this is similar to do_lamp_tex in texture.c, which in turn is similar
+ * to do_material_tex; maybe all three functions should share most of the code
+ * but there are many subtleties there.
+ */
+static void do_lamp_tex_eval(LampRen *la, float *texvec, int osatex, float *colf)
+{
+	MTex *mtex;
+	Tex *tex;
+	TexResult texres= {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0, NULL};
+	float fact, stencilTin=1.0;
+	int tex_nr, rgb= 0;
+	float dt[3]= {0.0, 0.0, 0.0};
+	
+	tex_nr= 0;
+	
+	for(; tex_nr<MAX_MTEX; tex_nr++) {
+		mtex= la->mtex[tex_nr];
+		if(mtex==NULL)
+			continue;
+
+		tex= mtex->tex;
+		if(tex==NULL)
+			continue;
+		
+		texres.nor= NULL;
+		
+		/* NOTE: of course we ignore projection */
+		
+		/* size and offset */
+		texvec[0]= mtex->size[0]*(texvec[0] + mtex->ofs[0]);
+		texvec[1]= mtex->size[1]*(texvec[1] + mtex->ofs[1]);
+		texvec[2]= mtex->size[2]*(texvec[2] + mtex->ofs[2]);
+		
+		/* TODO: do we need to support osa? e.g. for high res textures */
+		
+		rgb= multitex_ext(tex, texvec, dt, dt, osatex, &texres);
+
+		/* texture output */
+		if(rgb && (mtex->texflag & MTEX_RGBTOINT)) {
+			texres.tin= (0.35*texres.tr+0.45*texres.tg+0.2*texres.tb);
+			rgb= 0;
+		}
+		if(mtex->texflag & MTEX_NEGATIVE) {
+			if(rgb) {
+				texres.tr= 1.0-texres.tr;
+				texres.tg= 1.0-texres.tg;
+				texres.tb= 1.0-texres.tb;
+			}
+			else texres.tin= 1.0-texres.tin;
+		}
+		if(mtex->texflag & MTEX_STENCIL) {
+			if(rgb) {
+				fact= texres.ta;
+				texres.ta*= stencilTin;
+				stencilTin*= fact;
+			}
+			else {
+				fact= texres.tin;
+				texres.tin*= stencilTin;
+				stencilTin*= fact;
+			}
+		}
+		else {
+			if(rgb) texres.ta*= stencilTin;
+			else texres.tin*= stencilTin;
+		}
+		
+		/* mapping */
+		if(mtex->mapto & LAMAP_COL) {
+			float col[3];
+			
+			if(rgb==0) {
+				texres.tr= mtex->r;
+				texres.tg= mtex->g;
+				texres.tb= mtex->b;
+			}
+			else if(mtex->mapto & MAP_ALPHA) {
+				texres.tin= stencilTin;
+			}
+			else texres.tin= texres.ta;
+
+			/* lamp colors were premultiplied with this */
+			col[0]= texres.tr*la->energy;
+			col[1]= texres.tg*la->energy;
+			col[2]= texres.tb*la->energy;
+			
+			texture_rgb_blend(colf, col, colf, texres.tin, mtex->colfac, mtex->blendtype);
+		}
+	}
+}
+
 static void convert_area_light(Render * re, LightcutsData *lcd, LampRen *orig)
 {
 	GroupObject *gonew;
@@ -685,8 +778,8 @@
 	float stepx, stepy, texvec[2];
 	LampRen *lar;
 	float density;
-	Tex *tex;
 	int use_texture= 0;
+	int tex_nr;
 	
 	density= sqrtf(re->r.lightcuts_area_density);
 
@@ -709,10 +802,13 @@
 		return;
 	}
 	
-	/* XXX: add multichannel/stencil/etc. support */
-	if (orig->mtex[0] && orig->mtex[0]->tex) {
-		tex= orig->mtex[0]->tex;
-		use_texture= 1;
+	if (!(re->r.scemode & R_NO_TEX)) {
+		for(tex_nr= 0; tex_nr<MAX_MTEX; tex_nr++) {
+			if(orig->mtex[tex_nr] && orig->mtex[tex_nr]->tex) {
+				use_texture= 1;
+				break;
+			}
+		}
 	}
 
 	for (x=0; x<smpx; x++) {
@@ -735,17 +831,12 @@
 			stepy= orig->area_sizey * (texvec[1] - 0.5f);
 			
 			if (use_texture) {
-				int ret;
-				TexResult texres= {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0, NULL};
-				
-				/* NOTE: not using osatex */
+				/* TODO: NOTE: not using osatex */
 				texvec[0]= 1.0f - texvec[0]*2.0f;
 				texvec[1]= texvec[1]*2.0f - 1.0f;
-				ret= multitex_ext(tex, texvec, NULL, NULL, 0, &texres);
 				
-				col[0]= texres.tr * orig->energy;
-				col[1]= texres.tg * orig->energy;
-				col[2]= texres.tb * orig->energy;
+				col[0]= col[1]= col[2]= 0.0f;
+				do_lamp_tex_eval(orig, texvec, 0, col);
 			}
 			else {
 				col[0]= orig->r;