Add initial GPU based curve rendering implementation, utilizing TTF fonts and manual shapes

2 files changed, 112 insertions, 0 deletions

diff --git a/src/com/jogamp/graph/curve/shader/curverenderer.fp b/src/com/jogamp/graph/curve/shader/curverenderer.fp
new file mode 100644
index 000000000..2b3a0ce1d
--- /dev/null
+++ b/src/com/jogamp/graph/curve/shader/curverenderer.fp
@@ -0,0 +1,99 @@
+//#version 100
+
+uniform float p1y;
+uniform float g_alpha;
+uniform vec3 g_color;
+uniform float a_strength;
+
+varying vec2 v_texCoord;
+
+vec3 b_color = vec3(0.0, 0.0, 0.0);
+
+uniform sampler2D texture;
+vec4 weights = vec4(0.075, 0.06, 0.045, 0.025);
+
+void main (void)
+{
+	vec2 rtex = vec2(abs(v_texCoord.x),abs(v_texCoord.y));
+	vec3 c = g_color;
+	
+	float alpha = 0.0;
+	
+	if((v_texCoord.x == 0.0) && (v_texCoord.y == 0.0)){
+	 	alpha = g_alpha;
+	}
+	else if((v_texCoord.x >= 5.0)){
+		vec2 dfx = dFdx(v_texCoord);
+		vec2 dfy = dFdy(v_texCoord);
+		
+		vec2 size = 1.0/textureSize(texture,0); //version 130
+		rtex -= 5.0;
+		vec4 t = texture2D(texture, rtex)* 0.18;
+
+		t += texture2D(texture, rtex + size*(vec2(1, 0)))*weights.x;
+		t +=  texture2D(texture, rtex - size*(vec2(1, 0)))*weights.x;
+		t +=  texture2D(texture, rtex + size*(vec2(0, 1)))*weights.x;
+		t +=  texture2D(texture, rtex - size*(vec2(0, 1)))*weights.x;
+		
+		t += texture2D(texture, rtex + 2.0*size*(vec2(1, 0))) *weights.y;
+		t +=  texture2D(texture, rtex - 2.0*size*(vec2(1, 0)))*weights.y;
+		t +=  texture2D(texture, rtex + 2.0*size*(vec2(0, 1)))*weights.y; 
+		t +=  texture2D(texture, rtex - 2.0*size*(vec2(0, 1)))*weights.y;
+		
+		t += texture2D(texture, rtex + 3.0*size*(vec2(1, 0))) *weights.z;
+		t +=  texture2D(texture, rtex - 3.0*size*(vec2(1, 0)))*weights.z;
+		t +=  texture2D(texture, rtex + 3.0*size*(vec2(0, 1)))*weights.z;
+		t +=  texture2D(texture, rtex - 3.0*size*(vec2(0, 1)))*weights.z;
+		
+		t += texture2D(texture, rtex + 4.0*size*(vec2(1, 0))) *weights.w;
+		t +=  texture2D(texture, rtex - 4.0*size*(vec2(1, 0)))*weights.w;
+		t +=  texture2D(texture, rtex + 4.0*size*(vec2(0, 1)))*weights.w;
+		t +=  texture2D(texture, rtex - 4.0*size*(vec2(0, 1)))*weights.w;
+		
+		if(t.w == 0.0){
+			discard;
+		}
+		
+		c = t.xyz;
+		alpha = g_alpha* t.w;
+	}
+	///////////////////////////////////////////////////////////
+	else if ((v_texCoord.x > 0.0) && (rtex.y > 0.0 || rtex.x == 1.0)){
+  		vec2 dtx = dFdx(rtex);
+  		vec2 dty = dFdy(rtex);
+  		
+  		rtex.y -= 0.1;
+  		if(rtex.y < 0.0) {
+  			if(v_texCoord.y < 0.0)
+  				discard;
+  			else{
+  				rtex.y = 0.0;
+  			}
+  		}
+  		
+  		vec2 f = vec2((dtx.y - 2.0*p1y*dtx.x + 4.0*p1y*rtex.x*dtx.x), (dty.y - 2.0*p1y*dty.x + 4.0*p1y*rtex.x*dty.x));
+  		
+  		float position = rtex.y - ((2.0 * rtex.x * p1y) * (1.0 - rtex.x));
+  		float d = position/(length(f));
+
+		float a = (0.5 - d * sign(v_texCoord.y));  
+		
+		
+		if (a >= 1.0)  { 
+	    	alpha = g_alpha;
+	    //	c = vec3(1.0,1.0,1.0);
+    	} 
+  		else if (a <= 0.0) {
+   			alpha = 0.0;//discard;
+   		//	c = vec3(0.0,0.0,0.0);
+   			
+   		}
+  		else {           
+    		alpha = g_alpha*a;
+    	//	c = vec3(a,a,a);
+    		mix(b_color,g_color, a);
+    	}  
+	}
+	
+    gl_FragColor = vec4(c, alpha);
+}
diff --git a/src/com/jogamp/graph/curve/shader/curverenderer.vp b/src/com/jogamp/graph/curve/shader/curverenderer.vp
new file mode 100644
index 000000000..bc9ecb41e
--- /dev/null
+++ b/src/com/jogamp/graph/curve/shader/curverenderer.vp
@@ -0,0 +1,13 @@
+//#version 100
+
+uniform mat4 mgl_PMVMatrix[2];
+attribute vec4 v_position;
+attribute vec2 texCoord; 
+
+varying vec2 v_texCoord;
+
+void main(void)
+{
+  gl_Position = mgl_PMVMatrix[0] * mgl_PMVMatrix[1] * v_position;
+  v_texCoord = texCoord.st;
+}
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