Spring RTS Engine

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//!!ARBvp1.0
//# vertex program for generating the shadow buffer

unifrom vec4 p16; //See lines, 259-264, http://github.com/spring/spring/blob/master/rts/Rendering/ShadowHandler.cpp
uniform vec4 p17; //this cooresponds to p17 in Spring source
uniform vec4 p18; //ditto

varying vec4 outPos;//output of function, for fragment shader

vec4 pos = gl_Vertex;

//ATTRIB pos = vertex.position;
//PARAM mat[4] = { state.matrix.projection };  //These should be sent as uniforms
//PARAM mat2[4] = { state.matrix.modelview };  //Ditto
//OUTPUT opos = result.position;  //Output, or gl_Position
//TEMP temp,temp2;

vec4 temp;
vec4 temp2;
mat4 projection = gl_ProjectionMatrix;
mat4 modelview = gl_ModelViewMatrix;

//DP4 temp.x, pos, mat2[0];
temp.x = dot(pos,modelview[0]);
//DP4 temp.y, pos, mat2[1];
temp.y = dot(pos,modelview[1]);

//ABS temp2,temp;
temp2 = abs(temp);

//ADD temp2,temp2,program.env[17];
temp2 = temp2 + p17;

//RSQ temp2.x, temp2.x;
temp2.x = 1.0 / sqrt(temp2.x);
//RSQ temp2.y, temp2.y;
temp2.y = 1.0 / sqrt(temp2.y);
//ADD temp2,temp2,program.env[18];
temp2 = temp2 + p18;
//MAD temp, temp, temp2,program.env[16];
temp = (temp * temp2) + p16;
//DP4 temp.z, pos, mat2[2];
temp.z = dot(pos,modelview[2]);
//DP4 temp.w, pos, mat2[3];
temp.w = dot(pos,modelview[3]);

//DP4 opos.x, temp, mat[0];
outPos.x = dot(temp,projection[0]);
//DP4 opos.y, temp, mat[1];
outPos.y = dot(temp,projection[1]);
//DP4 opos.z, temp, mat[2];
outPos.z = dot(temp,projection[2]);
//DP4 opos.w, temp, mat[3];
outPos.w = dot(temp, projection[3]);

//#need texture coord for alpha testing (to shadow masked texels correctly)
//MOV result.texcoord[0], vertex.texcoord[0];
gl_TexCoord[0] = outPos;

//END