add Sprite.pattern_blend_type

binding/sprite-binding.cpp

@@ -65,6 +65,7 @@ DEF_GFX_PROP_I(Sprite, BushDepth)
 DEF_GFX_PROP_I(Sprite, BushOpacity)
 DEF_GFX_PROP_I(Sprite, Opacity)
 DEF_GFX_PROP_I(Sprite, BlendType)
+DEF_GFX_PROP_I(Sprite, PatternBlendType)
 DEF_GFX_PROP_I(Sprite, PatternOpacity)
 DEF_GFX_PROP_I(Sprite, PatternScrollX)
 DEF_GFX_PROP_I(Sprite, PatternScrollY)
@@ -141,6 +142,7 @@ void spriteBindingInit() {
     INIT_PROP_BIND(Sprite, BushOpacity, "bush_opacity");
     
     INIT_PROP_BIND(Sprite, Pattern, "pattern");
+    INIT_PROP_BIND(Sprite, PatternBlendType, "pattern_blend_type");
     INIT_PROP_BIND(Sprite, PatternTile, "pattern_tile");
     INIT_PROP_BIND(Sprite, PatternOpacity, "pattern_opacity");
     INIT_PROP_BIND(Sprite, PatternScrollX, "pattern_scroll_x");

shader/sprite.frag

@@ -10,6 +10,7 @@ uniform float bushDepth;
 uniform lowp float bushOpacity;
 
 uniform sampler2D pattern;
+uniform int patternBlendType;
 uniform lowp float patternOpacity;
 uniform bool renderPattern;
 
@@ -21,6 +22,47 @@ varying vec2 v_patCoord;
 const vec3 lumaF = vec3(.299, .587, .114);
 const vec2 repeat = vec2(1, 1);
 
+
+// = = = = = = = = = = =
+// mixing functions, from https://github.com/jamieowen/glsl-blend
+// = = = = = = = = = = =
+
+// Normal
+vec3 blendNormal(vec3 base, vec3 blend) {
+    return blend;
+}
+
+vec3 blendNormal(vec3 base, vec3 blend, float opacity) {
+    return (blendNormal(base, blend) * opacity + base * (1.0 - opacity));
+}
+
+// Add
+float blendAdd(float base, float blend) {
+    return min(base+blend,1.0);
+}
+
+vec3 blendAdd(vec3 base, vec3 blend) {
+    return min(base+blend,vec3(1.0));
+}
+
+vec3 blendAdd(vec3 base, vec3 blend, float opacity) {
+    return (blendAdd(base, blend) * opacity + base * (1.0 - opacity));
+}
+
+// Substract
+float blendSubstract(float base, float blend) {
+    return max(base+blend-1.0,0.0);
+}
+
+vec3 blendSubstract(vec3 base, vec3 blend) {
+    return max(base+blend-vec3(1.0),vec3(0.0));
+}
+
+vec3 blendSubstract(vec3 base, vec3 blend, float opacity) {
+    return (blendSubstract(base, blend) * opacity + blend * (1.0 - opacity));
+}
+// = = = = = = = = = = =
+
 void main()
 {
 	/* Sample source color */
@@ -29,12 +71,15 @@ void main()
     /* Apply pattern */
     if (renderPattern) {
         vec4 pattfrag = texture2D(pattern, mod(v_patCoord, repeat));
-        frag.rgb = mix(frag.rgb, pattfrag.rgb, pattfrag.a * patternOpacity);
-    }
-    
-    /* Apply color inversion */
-    if (invert) {
-        frag.rgb = vec3(1.0 - frag.r, 1.0 - frag.g, 1.0 - frag.b);
+        if (patternBlendType == 1) {
+            frag.rgb = frag.rgb = blendAdd(frag.rgb, pattfrag.rgb, pattfrag.a * patternOpacity);
+        }
+        else if (patternBlendType == 2) {
+            frag.rgb = blendSubstract(frag.rgb, pattfrag.rgb, pattfrag.a * patternOpacity);
+        }
+        else {
+            frag.rgb = blendNormal(frag.rgb, pattfrag.rgb, pattfrag.a * patternOpacity);
+        }
     }
 	
 	/* Apply gray */
@@ -49,6 +94,11 @@ void main()
 	
 	/* Apply color */
 	frag.rgb = mix(frag.rgb, color.rgb, color.a);
+    
+    /* Apply color inversion */
+    if (invert) {
+        frag.rgb = vec3(1.0 - frag.r, 1.0 - frag.g, 1.0 - frag.b);
+    }
 
 	/* Apply bush alpha by mathematical if */
 	lowp float underBush = float(v_texCoord.y < bushDepth);

shader/sprite.vert

@@ -24,12 +24,12 @@ void main()
     
     if (renderPattern) {
         if (patternTile) {
-            vec2 scroll = patternScroll * patternZoom;
-            v_patCoord = (texCoord * patternSizeInv) - (scroll * patternSizeInv);
+            vec2 scroll = patternScroll * (patternSizeInv / texSizeInv);
+            v_patCoord = (texCoord * (patternSizeInv / patternZoom)) - (scroll * patternSizeInv);
         }
         else {
-            vec2 scroll = patternScroll * (patternSizeInv / texSizeInv) * patternZoom;
-            v_patCoord = (texCoord * texSizeInv) - (scroll * texSizeInv);
+            vec2 scroll = patternScroll * (patternSizeInv / texSizeInv);
+            v_patCoord = (texCoord * (texSizeInv / patternZoom)) - (scroll * texSizeInv);
         }
     }
 }

src/display/gl/shader.cpp

@@ -469,6 +469,7 @@ SpriteShader::SpriteShader()
 	GET_U(bushDepth);
 	GET_U(bushOpacity);
     GET_U(pattern);
+    GET_U(patternBlendType);
     GET_U(patternTile);
     GET_U(renderPattern);
     GET_U(patternSizeInv);
@@ -514,6 +515,11 @@ void SpriteShader::setPattern(const TEX::ID pattern, const Vec2 &dimensions)
     gl.Uniform2f(u_patternSizeInv, 1.f / dimensions.x, 1.f / dimensions.y);
 }
 
+void SpriteShader::setPatternBlendType(int blendType)
+{
+    gl.Uniform1i(u_patternBlendType, blendType);
+}
+
 void SpriteShader::setPatternTile(bool value)
 {
     gl.Uniform1i(u_patternTile, value);

src/display/gl/shader.h

@@ -192,6 +192,7 @@ public:
 	void setBushDepth(float value);
 	void setBushOpacity(float value);
     void setPattern(const TEX::ID pattern, const Vec2 &dimensions);
+    void setPatternBlendType(int blendType);
     void setPatternTile(bool value);
     void setShouldRenderPattern(bool value);
     void setPatternOpacity(float value);
@@ -201,7 +202,7 @@ public:
 
 private:
 	GLint u_spriteMat, u_tone, u_opacity, u_color, u_bushDepth, u_bushOpacity, u_pattern, u_renderPattern,
-    u_patternSizeInv, u_patternTile, u_patternOpacity, u_patternScroll, u_patternZoom, u_invert;
+    u_patternBlendType, u_patternSizeInv, u_patternTile, u_patternOpacity, u_patternScroll, u_patternZoom, u_invert;
 };
 
 class PlaneShader : public ShaderBase

src/display/sprite.cpp

@@ -61,6 +61,7 @@ struct SpritePrivate
     BlendType blendType;
     
     Bitmap *pattern;
+    BlendType patternBlendType;
     bool patternTile;
     NormValue patternOpacity;
     Vec2 patternScroll;
@@ -337,6 +338,7 @@ DEF_ATTR_RD_SIMPLE(Sprite, Mirror,     bool,    p->mirrored)
 DEF_ATTR_RD_SIMPLE(Sprite, BushDepth,  int,     p->bushDepth)
 DEF_ATTR_RD_SIMPLE(Sprite, BlendType,  int,     p->blendType)
 DEF_ATTR_RD_SIMPLE(Sprite, Pattern,    Bitmap*, p->pattern)
+DEF_ATTR_RD_SIMPLE(Sprite, PatternBlendType, int, p->patternBlendType)
 DEF_ATTR_RD_SIMPLE(Sprite, Width,      int,     p->srcRect->width)
 DEF_ATTR_RD_SIMPLE(Sprite, Height,     int,     p->srcRect->height)
 DEF_ATTR_RD_SIMPLE(Sprite, WaveAmp,    int,     p->wave.amp)
@@ -512,6 +514,25 @@ void Sprite::setPattern(Bitmap *value)
         value->ensureNonMega();
 }
 
+void Sprite::setPatternBlendType(int type)
+{
+    guardDisposed();
+    
+    switch (type)
+    {
+        default :
+        case BlendNormal :
+            p->patternBlendType = BlendNormal;
+            return;
+        case BlendAddition :
+            p->patternBlendType = BlendAddition;
+            return;
+        case BlendSubstraction :
+            p->patternBlendType = BlendSubstraction;
+            return;
+    }
+}
+
 #define DEF_WAVE_SETTER(Name, name, type) \
 void Sprite::setWave##Name(type value) \
 { \
@@ -582,6 +603,7 @@ void Sprite::draw()
         
         if (p->pattern && p->patternOpacity > 0) {
             shader.setPattern(p->pattern->getGLTypes().tex, Vec2(p->pattern->width(), p->pattern->height()));
+            shader.setPatternBlendType(p->patternBlendType);
             shader.setPatternTile(p->patternTile);
             shader.setPatternZoom(p->patternZoom);
             shader.setPatternOpacity(p->patternOpacity.norm);

src/display/sprite.h

@@ -63,6 +63,7 @@ public:
 	DECL_ATTR( Color,       Color&  )
 	DECL_ATTR( Tone,        Tone&   )
     DECL_ATTR( Pattern,     Bitmap* )
+    DECL_ATTR( PatternBlendType, int)
     DECL_ATTR( PatternTile, bool    )
     DECL_ATTR( PatternOpacity, int  )
     DECL_ATTR( PatternScrollX, int  )