颜色混合

src/texture/Image.cc

@@ -36,8 +36,8 @@ Rgba Image::pixelAt(int x, int y) const {
 }
 
 Rgba Image::pixelUv(float u, float v) const {
-    int x = (u * _width) -1; //不管_width还是_height都是从0开始的，
-    int y = (v * _height) -1;//所以这里要减去1
+    int x = (u * _width) ;
+    int y = (v * _height) -2;//TODO ???
     
     return pixelAt(x, y);
     //return Rgba(255,0,0);

src/texture/Raster.cc

@@ -113,6 +113,8 @@ void Raster::drawSpan(const Span &span, Image* image) {
     //float length = tmax<int>(span.xStart - span.xEnd, 1); //取保length不为0
 
     Rgba color;
+    Rgba blendColor;
+    Rgba dstColor;
     float2 uv;
     float scale;
     float length = span.xEnd - span.xStart;
@@ -131,11 +133,18 @@ void Raster::drawSpan(const Span &span, Image* image) {
         } else {
             scale = (float) (i - startX) / length;
         }
-        
+
+        blendColor = colorLerp(span.color1, span.color2, scale);
         uv = uvLerp(span.uvStart, span.uvEnd, scale);
 
         color = image->pixelUv(uv.x, uv.y);
-        setPixel(i, span.y, color);
+
+        //颜色混合
+        dstColor = color + blendColor;
+        
+        
+
+        setPixel(i, span.y, dstColor);
     }
 }
 
@@ -163,6 +172,9 @@ void Raster::drawEge(const Ege& e1, const Ege& e2, Image* image) {
 
     float2 uvE1;
     float2 uvE2;
+    Rgba color1;
+    Rgba color2;
+
     for (int y = startY2; y > endY2; y--) {
 
         int x2;
@@ -171,6 +183,7 @@ void Raster::drawEge(const Ege& e1, const Ege& e2, Image* image) {
         } else {
             x2 = e2.x2 - xOffset2 * scale2;
         }
+        color2 = colorLerp(e2.color1, e2.color2, scale2);
         uvE2 = uvLerp(e2.uv2, e2.uv1, scale2);
         scale2 += setp2;
         //setPixel(x2, y, Rgba(255,0,0));
@@ -182,11 +195,12 @@ void Raster::drawEge(const Ege& e1, const Ege& e2, Image* image) {
         } else {
             x1 = e1.x2 - xOffset1 * scale1;
         }
+        color1 = colorLerp(e1.color1, e1.color2, scale1);
         uvE1 = uvLerp(e1.uv2, e1.uv1, scale1);
         scale1 += setp1;
         //setPixel(x1, y, Rgba(255,0,0));
 
-        Span span(x1, x2, y, Rgba(255, 255, 255), Rgba(255, 255, 255), uvE1, uvE2);
+        Span span(x1, x2, y, color1, color2, uvE1, uvE2);
         drawSpan(span, image);
     }
 }

src/texture/Rgba.cc

@@ -36,6 +36,13 @@ bool operator!=(Rgba &left, Rgba &right) {
     return left._a != right._a || left._b != right._b || left._g != right._g || left._r != right._r;
 }
 
+Rgba operator+(Rgba &left, Rgba &right) {
+    return  Rgba(left._r + right._r
+                            ,left._g + right._g
+                            ,left._b + right._b
+                            ,left._a + right._a);
+}
+
 Rgba::operator unsigned() {
     unsigned int ret;
 

src/texture/Rgba.h

@@ -18,10 +18,11 @@
 
 class Rgba {
 public:
-    Rgba(unsigned char r = 0, unsigned char g = 0, unsigned char b = 0, unsigned char a = 255);
+    Rgba(unsigned char r = 255, unsigned char g = 255, unsigned char b = 255, unsigned char a = 255);
     Rgba(unsigned int rgba);
     friend bool operator==(Rgba &left, Rgba &right);
     friend bool operator!=(Rgba &left, Rgba &righe);
+    friend Rgba operator+(Rgba &left, Rgba &righe);
     operator unsigned();
     operator int();
     operator long();

src/texture/texture.cc

@@ -21,9 +21,9 @@ void example() {
     Image* image = Image::loadFromFile("/home/blobt/Documents/dev/cpp/3dbase/image/scale.jpg");
 
         Raster::Vertex ver1 = {
-            int2(10, 10), float2(0.0f, 0.0f), Rgba(),
-            int2(10, 110), float2(0.0f, 1.0f), Rgba(),
-            int2(110, 10), float2(1.0f, 0.0f), Rgba()
+            int2(10, 10), float2(0.0f, 0.0f), Rgba(255,0,0),
+            int2(10, 110), float2(0.0f, 1.0f),Rgba(255,0,0),
+            int2(110, 10), float2(1.0f, 0.0f), Rgba(255,0,0)
         };
     
         raster.drawTriangle(ver1, image);
@@ -31,9 +31,9 @@ void example() {
 
 
     Raster::Vertex ver2 = {
-        int2(10, 110), float2(0.0f, 1.0f), Rgba(),
-        int2(110, 110), float2(1.0f, 1.0f), Rgba(),
-        int2(110, 10), float2(1.0f, 0.0f), Rgba()
+        int2(10, 110), float2(0.0f, 1.0f), Rgba(255,0,0),
+        int2(110, 110), float2(1.0f, 1.0f), Rgba(255,0,0),
+        int2(110, 10), float2(1.0f, 0.0f), Rgba(255,0,0)
     };
 
     raster.drawTriangle(ver2, image);