Texture lighting / color configuration.

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/Panel.java

@@ -17,8 +17,6 @@ import java.awt.GraphicsEnvironment;
 import java.awt.GraphicsConfiguration;
 import java.awt.Toolkit;
 
-import sig.Texture;
-
 public class Panel extends JPanel implements Runnable {
     long startTime = System.nanoTime();
     long endTime = System.nanoTime();
@@ -77,6 +75,8 @@ public class Panel extends JPanel implements Runnable {
         int[] p = pixel; // this avoid crash when resizing
         //a=h/w
 
+        fTheta+=0.05f;
+
         final int h=SigRenderer.SCREEN_HEIGHT;
         if(p.length != width * height) return;        
         for (int x=0;x<width;x++) {
@@ -114,6 +114,7 @@ public class Panel extends JPanel implements Runnable {
             triTransformed.T = t.T;
             triTransformed.U = t.U;
             triTransformed.V = t.V;
+            triTransformed.textured = t.textured;
 
             Vector normal=new Vector(),line1=new Vector(),line2=new Vector();
             line1 = Vector.subtract(triTransformed.B,triTransformed.A);
@@ -138,6 +139,7 @@ public class Panel extends JPanel implements Runnable {
                 triViewed.T = triTransformed.T;
                 triViewed.U = triTransformed.U;
                 triViewed.V = triTransformed.V;
+                triViewed.textured = triTransformed.textured;
 
                 int clippedTriangles = 0;
                 Triangle[] clipped = new Triangle[]{new Triangle(),new Triangle()};
@@ -151,6 +153,7 @@ public class Panel extends JPanel implements Runnable {
                     triProjected.B = Matrix.MultiplyVector(SigRenderer.matProj,clipped[i].B);
                     triProjected.C = Matrix.MultiplyVector(SigRenderer.matProj,clipped[i].C);
                     triProjected.col = clipped[i].col;
+                    triProjected.textured = clipped[i].textured;
                     triProjected.T = (Vector2)clipped[i].T.clone();
                     triProjected.U = (Vector2)clipped[i].U.clone();
                     triProjected.V = (Vector2)clipped[i].V.clone();
@@ -227,11 +230,15 @@ public class Panel extends JPanel implements Runnable {
             }
 
             for (Triangle tt : triList) {
+                if (tt.textured) {
                     DrawUtils.TexturedTriangle(p, 
                         (int)tt.A.x,(int)tt.A.y,tt.T.u,tt.T.v,tt.T.w,
                         (int)tt.B.x,(int)tt.B.y,tt.U.u,tt.U.v,tt.U.w,
                         (int)tt.C.x,(int)tt.C.y,tt.V.u,tt.V.v,tt.V.w,
-                SigRenderer.dirtTex);
+                    SigRenderer.dirtTex,tt.col.getRed());
+                } else {
+                    DrawUtils.FillTriangle(p,(int)tt.A.x,(int)tt.A.y,(int)tt.B.x,(int)tt.B.y,(int)tt.C.x,(int)tt.C.y,tt.getColor());
+                }
                 if (SigRenderer.WIREFRAME) {
                     DrawUtils.DrawTriangle(p,(int)tt.A.x,(int)tt.A.y,(int)tt.B.x,(int)tt.B.y,(int)tt.C.x,(int)tt.C.y,Color.WHITE);
                 }

src/sig/SigRenderer.java

@@ -2,11 +2,12 @@ package sig;
 import javax.imageio.ImageIO;
 import javax.swing.JFrame;
 
+import sig.utils.OBJReader;
+
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener; 
 import java.awt.event.MouseMotionListener;
 import java.io.File;
-import java.io.IOException;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
 import java.util.Arrays;
@@ -80,7 +81,7 @@ public class SigRenderer implements KeyListener,MouseListener,MouseMotionListene
     SigRenderer(JFrame f) {
         dirtTex = new Texture(new File("dirt.png"));
 
-        //cube = new Mesh(OBJReader.ReadOBJFile("teapot.obj"));
+        //cube = new Mesh(OBJReader.ReadOBJFile("teapot.obj",false));
         cube = new Mesh(Arrays.asList(
             new Triangle[]{
                 new Triangle(new Vector(),new Vector(0,1,0),new Vector(1,1,0),new Vector2(0,1),new Vector2(0,0),new Vector2(1,0)),
@@ -97,6 +98,10 @@ public class SigRenderer implements KeyListener,MouseListener,MouseMotionListene
                 new Triangle(new Vector(1,0,1),new Vector(0,0,0),new Vector(1,0,0),new Vector2(0,1),new Vector2(1,0),new Vector2(1,1)),
             }));
 
+        for (Triangle t : cube.triangles) {
+            t.textured=true;
+        }
+
         Panel p = new Panel();
 
         f.getContentPane().addMouseListener(this);

src/sig/Texture.java

@@ -17,13 +17,14 @@ public class Texture{
         }
     }
 
-    public Color getColor(float u,float v) {
+    public Color getColor(float u,float v,float mult) {
         int sx = (int)(u*tex.getWidth()-1f);
         int sy = (int)(v*tex.getHeight()-1f);
         if (sx<0||sx>=tex.getWidth()||sy<0||sy>=tex.getHeight()) {
             return new Color(0,0,0,0);
         } else {
-            return new Color(tex.getRGB(sx,sy));
+            Color newCol = new Color(tex.getRGB(sx,sy));
+            return new Color((newCol.getRed()/255f)*mult,(newCol.getGreen()/255f)*mult,(newCol.getBlue()/255f)*mult);
         }
     }
     

src/sig/Triangle.java

@@ -5,6 +5,7 @@ public class Triangle {
     Vector A,B,C;
     Vector2 T,U,V;
     Color col = Color.WHITE;
+    public boolean textured=false;
     public Triangle() {
         this(new Vector(),new Vector(),new Vector());
     }
@@ -27,7 +28,8 @@ public class Triangle {
     }
     @Override
     public String toString() {
-        return "Triangle [A=" + A + ", B=" + B + ", C=" + C + ", col=" + col + "]";
+        return "Triangle [A=" + A + ", B=" + B + ", C=" + C + ", T=" + T + ", U=" + U + ", V=" + V + ", col=" + col
+                + "]";
     }
     public Color getColor() {
         return col;
@@ -85,6 +87,7 @@ public class Triangle {
         if (insidePointCount==1&&outsidePointCount==2) {
             ExtraData t = new ExtraData(0);
             out_tri[0].col = in.col;
+            out_tri[0].textured = in.textured;
             out_tri[0].A = inside_points[0];
             out_tri[0].T = inside_tex[0];
             out_tri[0].B = Vector.IntersectPlane(plane_p, plane_n, inside_points[0], outside_points[0],t);
@@ -100,6 +103,7 @@ public class Triangle {
         if (insidePointCount==2&&outsidePointCount==1) {
             ExtraData t = new ExtraData(0);
             out_tri[0].col=out_tri[1].col=in.col;
+            out_tri[0].textured=out_tri[1].textured=in.textured;
             out_tri[0].A = inside_points[0];
             out_tri[0].B = inside_points[1];
             out_tri[0].T = inside_tex[0];

src/sig/Vector2.java

@@ -17,4 +17,8 @@ public class Vector2 {
     protected Object clone(){
         return new Vector2(u,v,w);
     }
+    @Override
+    public String toString() {
+        return "Vector2 [u=" + u + ", v=" + v + ", w=" + w + "]";
+    }
 }

src/sig/utils/DrawUtils.java

@@ -17,7 +17,7 @@ public class DrawUtils {
             int x1, int y1, float u1,float v1,float w1,
             int x2, int y2, float u2,float v2,float w2,
             int x3, int y3, float u3,float v3,float w3,
-            Texture texture
+            Texture texture, int colorMult
     ) {
 		if (y2<y1) {int t=y1;y1=y2;y2=t;t=x1;x1=x2;x2=t;float u=u1;u1=u2;u2=u;float v=v1;v1=v2;v2=v;float w=w1;w1=w2;w2=w;}
 		if (y3<y1) {int t=y1;y1=y3;y3=t;t=x1;x1=x3;x3=t;float u=u1;u1=u3;u3=u;float v=v1;v1=v3;v3=v;float w=w1;w1=w3;w3=w;}
@@ -79,7 +79,7 @@ public class DrawUtils {
                     tex_u=(1.0f-t)*tex_su+t*tex_eu;
                     tex_v=(1.0f-t)*tex_sv+t*tex_ev;
                     tex_w=(1.0f-t)*tex_sw+t*tex_ew;
-                    Draw(canvas,j,i,texture.getColor(tex_u/tex_w,tex_v/tex_w));
+                    Draw(canvas,j,i,texture.getColor(tex_u/tex_w,tex_v/tex_w,colorMult/255f));
                     t+=tstep;
                 }
             }
@@ -128,7 +128,7 @@ public class DrawUtils {
                     tex_u=(1.0f-t)*tex_su+t*tex_eu;
                     tex_v=(1.0f-t)*tex_sv+t*tex_ev;
                     tex_w=(1.0f-t)*tex_sw+t*tex_ew;
-                    Draw(canvas,j,i,texture.getColor(tex_u/tex_w,tex_v/tex_w));
+                    Draw(canvas,j,i,texture.getColor(tex_u/tex_w,tex_v/tex_w,colorMult/255f));
                     t+=tstep;
                 }
             }

src/sig/utils/OBJReader.java

@@ -7,19 +7,53 @@ import java.util.regex.Pattern;
 
 import sig.Triangle;
 import sig.Vector;
+import sig.Vector2;
 
 public class OBJReader {
-    public static List<Triangle> ReadOBJFile(String f) {
+    public static List<Triangle> ReadOBJFile(String f,boolean textured) {
         String[] data = FileUtils.readFromFile(f);
         List<float[]> vertices = new ArrayList<>();
+        List<float[]> texs = new ArrayList<>();
         List<Triangle> tris = new ArrayList<>();
         for (String s : data) {
             String[] split = s.split(Pattern.quote(" "));
             if (split[0].equalsIgnoreCase("v")) {
                 vertices.add(new float[]{Float.parseFloat(split[1]),Float.parseFloat(split[2]),Float.parseFloat(split[3])});
             } else
+            if (split[0].equalsIgnoreCase("vt")) {
+                texs.add(new float[]{Float.parseFloat(split[1]),Float.parseFloat(split[2])});
+            } else
             if (split[0].equalsIgnoreCase("f")) {
-                tris.add(new Triangle(
+                if (textured) {
+                    String[] spl1=split[1].split(Pattern.quote("/"));
+                    String[] spl2=split[2].split(Pattern.quote("/"));
+                    String[] spl3=split[3].split(Pattern.quote("/"));
+                    Triangle tri = new Triangle(
+                        new Vector(
+                            vertices.get(Integer.parseInt(spl1[0])-1)[0],
+                            vertices.get(Integer.parseInt(spl2[0])-1)[1],
+                            vertices.get(Integer.parseInt(spl3[0])-1)[2]),
+                        new Vector(
+                            vertices.get(Integer.parseInt(spl1[0])-1)[0],
+                            vertices.get(Integer.parseInt(spl2[0])-1)[1],
+                            vertices.get(Integer.parseInt(spl3[0])-1)[2]),
+                        new Vector(
+                            vertices.get(Integer.parseInt(spl1[0])-1)[0],
+                            vertices.get(Integer.parseInt(spl2[0])-1)[1],
+                            vertices.get(Integer.parseInt(spl3[0])-1)[2]),
+                        new Vector2(
+                            texs.get(Integer.parseInt(spl1[1])-1)[0],
+                            texs.get(Integer.parseInt(spl2[1])-1)[1]),
+                        new Vector2(
+                            texs.get(Integer.parseInt(spl1[1])-1)[0],
+                            texs.get(Integer.parseInt(spl2[1])-1)[1]),
+                        new Vector2(
+                            texs.get(Integer.parseInt(spl1[1])-1)[0],
+                            texs.get(Integer.parseInt(spl2[1])-1)[1]));
+                    tri.textured=textured; 
+                    tris.add(tri);
+                } else {
+                    Triangle tri = new Triangle(
                         new Vector(
                             vertices.get(Integer.parseInt(split[1])-1)[0],
                             vertices.get(Integer.parseInt(split[1])-1)[1],
@@ -31,7 +65,10 @@ public class OBJReader {
                         new Vector(
                             vertices.get(Integer.parseInt(split[3])-1)[0],
                             vertices.get(Integer.parseInt(split[3])-1)[1],
-                        vertices.get(Integer.parseInt(split[3])-1)[2])));
+                            vertices.get(Integer.parseInt(split[3])-1)[2]));
+                    tri.textured=textured;
+                    tris.add(tri);
+                }
             }
         }
         return tris;