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-rw-r--r--src/Runtime/res/effectlib/tessellationPath.glsllib198
1 files changed, 99 insertions, 99 deletions
diff --git a/src/Runtime/res/effectlib/tessellationPath.glsllib b/src/Runtime/res/effectlib/tessellationPath.glsllib
index 82d68fab..17b87b08 100644
--- a/src/Runtime/res/effectlib/tessellationPath.glsllib
+++ b/src/Runtime/res/effectlib/tessellationPath.glsllib
@@ -35,15 +35,15 @@
#if TESSELLATION_CONTROL_SHADER
layout (vertices = 5) out;
-void tessShader ( in float edgeTessAmount, float innerTessAmount )
+void tessShader ( in float edgeTessAmount, float innerTessAmount )
{
- gl_TessLevelOuter[0] = innerTessAmount;
- gl_TessLevelOuter[1] = edgeTessAmount;
- gl_TessLevelOuter[2] = innerTessAmount;
- gl_TessLevelOuter[3] = edgeTessAmount;
+ gl_TessLevelOuter[0] = innerTessAmount;
+ gl_TessLevelOuter[1] = edgeTessAmount;
+ gl_TessLevelOuter[2] = innerTessAmount;
+ gl_TessLevelOuter[3] = edgeTessAmount;
- gl_TessLevelInner[0] = edgeTessAmount / 2.0;
- gl_TessLevelInner[1] = innerTessAmount;
+ gl_TessLevelInner[0] = edgeTessAmount / 2.0;
+ gl_TessLevelInner[1] = innerTessAmount;
}
#endif
@@ -53,22 +53,22 @@ layout (quads, equal_spacing, cw) in;
vec2 getTangent(vec2 p0, vec2 p1, vec2 p2, vec2 p3, float t)
{
- // derivative
- float dbt0 = -3.0 * (1.0 - t) * (1.0 - t);
- float dbt1 = 3.0 * (1.0 - t) * (1.0 - 3.0 * t);
- float dbt2 = 3.0 * t * (2.0 - 3.0 * t);
- float dbt3 = 3.0 * t * t;
-
- // tangent on curve
- return normalize( dbt0 * p0 + dbt1 * p1 + dbt2 * p2 + dbt3 * p3 );
+ // derivative
+ float dbt0 = -3.0 * (1.0 - t) * (1.0 - t);
+ float dbt1 = 3.0 * (1.0 - t) * (1.0 - 3.0 * t);
+ float dbt2 = 3.0 * t * (2.0 - 3.0 * t);
+ float dbt3 = 3.0 * t * t;
+
+ // tangent on curve
+ return normalize( dbt0 * p0 + dbt1 * p1 + dbt2 * p2 + dbt3 * p3 );
}
//An exact cross product would involve normalizing dx,dy. Since
//this algorithm needs merely the sign, normalization is not necessary.
float roughCrossProd( vec2 prev, vec2 point, vec2 next )
{
- vec2 inDxDy = point - prev;
- vec2 outDxDy = next - point;
- return inDxDy.x * outDxDy.y - inDxDy.y * outDxDy.x;
+ vec2 inDxDy = point - prev;
+ vec2 outDxDy = next - point;
+ return inDxDy.x * outDxDy.y - inDxDy.y * outDxDy.x;
}
//The incoming corss product tells us both if we should do a seam merge
@@ -76,12 +76,12 @@ float roughCrossProd( vec2 prev, vec2 point, vec2 next )
//anchor point is at .5 gl_TessCoord.y space.
vec3 computeAdjoiningFactors( float cross, vec2 adjoining, vec2 point, float tessY )
{
- vec3 retval = vec3( 0.0, 0.0, 0.0 );
- float multiplier = cross < 0.0 ? 1.0 : -1.0;
- float weight = abs(cross) > 0.001 ? multiplier * ( ( tessY - .5 )/ .5 ) : 0.0;
- retval.z = weight > 0.0 ? 1.0 : 0.0;
- retval.xy = mix( point, adjoining, weight );
- return retval;
+ vec3 retval = vec3( 0.0, 0.0, 0.0 );
+ float multiplier = cross < 0.0 ? 1.0 : -1.0;
+ float weight = abs(cross) > 0.001 ? multiplier * ( ( tessY - .5 )/ .5 ) : 0.0;
+ retval.z = weight > 0.0 ? 1.0 : 0.0;
+ retval.xy = mix( point, adjoining, weight );
+ return retval;
}
#define NO_TAPER 0
@@ -91,9 +91,9 @@ vec3 computeAdjoiningFactors( float cross, vec2 adjoining, vec2 point, float tes
//Tapering is done by interpolating the path width somewhat cleverly.
float getTaperResult( float inIncomingValue, float inBeginValue, float inEndValue, vec2 taperData, uint inMode )
{
- float mixInfo = mix( taperData.x, taperData.y, gl_TessCoord.x );
- float theValueMixer = inMode == BEGIN_TAPER ? inBeginValue : inEndValue;
- return mix( theValueMixer, inIncomingValue, mixInfo );
+ float mixInfo = mix( taperData.x, taperData.y, gl_TessCoord.x );
+ float theValueMixer = inMode == BEGIN_TAPER ? inBeginValue : inEndValue;
+ return mix( theValueMixer, inIncomingValue, mixInfo );
}
uniform vec2 beginTaperInfo;
@@ -101,81 +101,81 @@ uniform vec2 endTaperInfo;
struct STessShaderResult
{
- vec3 m_Position;
- vec2 m_TexCoord;
- vec2 m_Tangent;
- vec2 m_Binormal;
- float m_Opacity;
+ vec3 m_Position;
+ vec2 m_TexCoord;
+ vec2 m_Tangent;
+ vec2 m_Binormal;
+ float m_Opacity;
};
-STessShaderResult tessShader ( float inPathWidth )
+STessShaderResult tessShader ( float inPathWidth )
{
- vec2 p1 = gl_in[0].gl_Position.xy;
- vec2 c1 = gl_in[0].gl_Position.zw; //c1
- vec2 c2 = gl_in[1].gl_Position.xy; //c2
- vec2 p2 = gl_in[1].gl_Position.zw;
- vec4 taperData = gl_in[3].gl_Position;
- vec2 udata = gl_in[4].gl_Position.xy;
-
- //Adjust width for taper if necessary.
- inPathWidth = taperData.z > 0.0 ? getTaperResult( inPathWidth, beginTaperInfo.x, endTaperInfo.x, taperData.xy, uint(taperData.z) ) : inPathWidth;
-
- float adjoiningWeight = 0.0;
- vec2 adjoining = vec2( 0.0, 0.0 );
- if ( gl_TessCoord.x == floor(gl_TessCoord.x) ) // gl_TessCord.x either 0.0 or 1.0
- {
- vec2 point, cross1, cross2;
- if ( gl_TessCoord.x == 0.0 )
- {
- adjoining = gl_in[2].gl_Position.xy;
- point = p1;
- cross1 = adjoining;
- cross2 = c1;
- }
- else // gl_TessCoord.x == 1.0
- {
- adjoining = gl_in[2].gl_Position.zw;
- point = p2;
- cross1 = c2;
- cross2 = adjoining;
- }
- float cross = roughCrossProd( cross1, point, cross2 );
- vec3 adjoiningFactors = computeAdjoiningFactors( cross, adjoining, point, gl_TessCoord.y );
- adjoining = adjoiningFactors.xy;
- adjoiningWeight = adjoiningFactors.z;
- }
-
- float v = gl_TessCoord.x;
- // cubic basis function calculated from v.
- float bv0 = (1.0 - v) * (1.0 - v) * (1.0 - v);
- float bv1 = 3.0 * v * (1.0 - v) * (1.0 - v);
- float bv2 = 3.0 * v * v * (1.0 - v);
- float bv3 = v * v * v;
-
- //u ranges from 0 - 1. What we want is to
- //have u range from -1,1.
- float u = 2.0 * ( gl_TessCoord.y - .5 );
-
- vec2 tangent = getTangent( p1, c1, c2, p2, v );
- vec2 normal = vec2( tangent.y, -tangent.x );
-
- vec2 offset = normal * inPathWidth * u;
-
- vec2 pointOnPath = bv0*p1 + bv1*c1 + bv2*c2 + bv3*p2;
-
- vec2 finalPosXY = offset + pointOnPath;
-
- STessShaderResult retval;
- retval.m_Position = vec3( mix( finalPosXY, adjoining, adjoiningWeight), 0.0 );
- retval.m_Opacity = taperData.z > 0.0 ? getTaperResult( 1.0, beginTaperInfo.y, endTaperInfo.y, taperData.xy, uint(taperData.z) ) : 1.0;
-
- // cubic interpolation of the texture coords
- retval.m_TexCoord.x = mix( udata.x, udata.y, v );
- retval.m_TexCoord.y = gl_TessCoord.y;
- retval.m_Tangent = tangent;
- retval.m_Binormal = normal;
-
- return retval;
+ vec2 p1 = gl_in[0].gl_Position.xy;
+ vec2 c1 = gl_in[0].gl_Position.zw; //c1
+ vec2 c2 = gl_in[1].gl_Position.xy; //c2
+ vec2 p2 = gl_in[1].gl_Position.zw;
+ vec4 taperData = gl_in[3].gl_Position;
+ vec2 udata = gl_in[4].gl_Position.xy;
+
+ //Adjust width for taper if necessary.
+ inPathWidth = taperData.z > 0.0 ? getTaperResult( inPathWidth, beginTaperInfo.x, endTaperInfo.x, taperData.xy, uint(taperData.z) ) : inPathWidth;
+
+ float adjoiningWeight = 0.0;
+ vec2 adjoining = vec2( 0.0, 0.0 );
+ if ( gl_TessCoord.x == floor(gl_TessCoord.x) ) // gl_TessCord.x either 0.0 or 1.0
+ {
+ vec2 point, cross1, cross2;
+ if ( gl_TessCoord.x == 0.0 )
+ {
+ adjoining = gl_in[2].gl_Position.xy;
+ point = p1;
+ cross1 = adjoining;
+ cross2 = c1;
+ }
+ else // gl_TessCoord.x == 1.0
+ {
+ adjoining = gl_in[2].gl_Position.zw;
+ point = p2;
+ cross1 = c2;
+ cross2 = adjoining;
+ }
+ float cross = roughCrossProd( cross1, point, cross2 );
+ vec3 adjoiningFactors = computeAdjoiningFactors( cross, adjoining, point, gl_TessCoord.y );
+ adjoining = adjoiningFactors.xy;
+ adjoiningWeight = adjoiningFactors.z;
+ }
+
+ float v = gl_TessCoord.x;
+ // cubic basis function calculated from v.
+ float bv0 = (1.0 - v) * (1.0 - v) * (1.0 - v);
+ float bv1 = 3.0 * v * (1.0 - v) * (1.0 - v);
+ float bv2 = 3.0 * v * v * (1.0 - v);
+ float bv3 = v * v * v;
+
+ //u ranges from 0 - 1. What we want is to
+ //have u range from -1,1.
+ float u = 2.0 * ( gl_TessCoord.y - .5 );
+
+ vec2 tangent = getTangent( p1, c1, c2, p2, v );
+ vec2 normal = vec2( tangent.y, -tangent.x );
+
+ vec2 offset = normal * inPathWidth * u;
+
+ vec2 pointOnPath = bv0*p1 + bv1*c1 + bv2*c2 + bv3*p2;
+
+ vec2 finalPosXY = offset + pointOnPath;
+
+ STessShaderResult retval;
+ retval.m_Position = vec3( mix( finalPosXY, adjoining, adjoiningWeight), 0.0 );
+ retval.m_Opacity = taperData.z > 0.0 ? getTaperResult( 1.0, beginTaperInfo.y, endTaperInfo.y, taperData.xy, uint(taperData.z) ) : 1.0;
+
+ // cubic interpolation of the texture coords
+ retval.m_TexCoord.x = mix( udata.x, udata.y, v );
+ retval.m_TexCoord.y = gl_TessCoord.y;
+ retval.m_Tangent = tangent;
+ retval.m_Binormal = normal;
+
+ return retval;
}
#endif
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