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#version 120
attribute float a_VertexID;
uniform float u_SegmentQuads;
uniform float u_Time;
//X = radius
//Y = z offset
//Z = transparency
uniform vec3 u_SegmentArray[11];
uniform vec3 u_CameraPosition;
uniform mat4 u_ModelMatrix;
varying vec2 v_TexCoord;
varying vec2 v_localPosition;
varying float v_Transparency;
const float PI = 3.1415926535897;
float getAngle(int quadID, int localID){
int id_offset = (localID > 1 && localID < 5)? 0:1;
return ((PI)*(quadID+id_offset))/u_SegmentQuads;
}
void main() {
int id = int(a_VertexID);
int segments = (u_SegmentArray.length()-1);
int quads = int(u_SegmentQuads);
int localID = int(mod(a_VertexID,6.0)); //Local id of the vertex within a face
int quadID = int(mod(float(id/6),quads)); //Local id of a quad within a segment
int segmentID = int(id/(quads*6));
segmentID = int(min(float(segmentID),float(segments-1)));
float radius0 = u_SegmentArray[segmentID].x;
float radius1 = u_SegmentArray[segmentID+1].x;
float offset0 = u_SegmentArray[segmentID].y;
float offset1 = u_SegmentArray[segmentID+1].y;
float trans0 = u_SegmentArray[segmentID].z;
float trans1 = u_SegmentArray[segmentID+1].z;
float slope = (radius1-radius0)/(offset1-offset0);
float cameraAngle = atan(u_CameraPosition.y,u_CameraPosition.x);
float staticAngle = getAngle(quadID,localID);
float angle = staticAngle+(cameraAngle-PI/2);
float offset = (localID > 0 && localID < 4)?offset0:offset1;
float radius = (localID > 0 && localID < 4)?radius0:radius1;
v_Transparency = (localID > 0 && localID < 4)?trans0:trans1;
//radius = min(radius,length(u_CameraPosition.xy));
vec3 localPosition = vec3(cos(angle)*radius,sin(angle)*radius,offset);
vec4 worldPosition = u_ModelMatrix*vec4(localPosition,1);
gl_Position = gl_ModelViewProjectionMatrix * worldPosition;
v_localPosition = localPosition.xy;
float timer = u_Time/240;
float heightOffset = (offset/256) + timer;
v_TexCoord = vec2(heightOffset,angle/(2*PI)+heightOffset/3 + timer);
}
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