Spring RTS Engine

Code: Select all

           // calc particle attributes
           vec3 attrib = vec3(1.0) - pow(vec3(1.0 - life), abs(attributesExp));
         //if (attributesExp.x<0.0) attrib.x = 1.0 - attrib.x; // speed (no need for backward movement)
           if (attributesExp.y<0.0) attrib.y = 1.0 - attrib.y; // size
           if (attributesExp.z<0.0) attrib.z = 1.0 - attrib.z; // rot
           attrib.yz   = attributesStart.yz + attrib.yz * attributesEnd.yz; 

           // calc vertex position
           vec3 forceV = (1.0 - pow(1.0 - life, abs(forceExp))) * forceDir; //FIXME combine with other attribs!
           vec4 pos4   = vec4(posV + attrib.x * dirV + forceV, 1.0);
           gl_Position = gl_ModelViewMatrix * pos4;

           // calc particle rotation
           float alpha     = attrib.z;
           float ca        = cos(alpha);
           float sa        = sin(alpha);
           mat2 rotation   = mat2( ca , -sa, sa, ca );

           // offset vertex from center of the polygon
           gl_Position.xy += rotation * ( (gl_Vertex.xy - 0.5) * attrib.y );

           // end
           gl_Position       = gl_ProjectionMatrix * gl_Position;
           gl_TexCoord[0].st = gl_Vertex.xy;

Code: Select all

// calc vertex position
gl_Position = gl_ModelViewMatrix * pos4;

// offset vertex from center of the polygon
gl_Position.xy += rotation * ( (gl_Vertex.xy - 0.5) * attrib.y );

// end
gl_Position       = gl_ProjectionMatrix * gl_Position;

Code: Select all

			gl_Position = gl_ModelViewMatrix * vec4(posData.xyz,0.0);

			// offset vertex from center of the polygon
			gl_Position.xy += (gl_Vertex.xy - 0.5) * finalSize;

			// end
			gl_Position = gl_ProjectionMatrix * gl_Position;