ptsize.vp

来自「OpeNGL超级宝典源代码. OpeNGL超级宝典源代码.」· VP 代码 · 共 38 行

!!ARBvp1.0

# ptsize.vp
#
# Generic vertex transformation,
# attenuated point size

ATTRIB iPos = vertex.position;             # input position
ATTRIB iPrC = vertex.color.primary;        # input primary color

OUTPUT oPos = result.position;             # output position
OUTPUT oPrC = result.color.primary;        # output primary color
OUTPUT oPtS = result.pointsize;            # output point size

PARAM mvp[4] = { state.matrix.mvp };       # model-view * proj matrix
PARAM mv[4] =  { state.matrix.modelview }; # model-view matrix

TEMP V, ptSize;                            # temporary registers

DP4 oPos.x, iPos, mvp[0];                  # xform input pos by MVP
DP4 oPos.y, iPos, mvp[1];
DP4 oPos.z, iPos, mvp[2];
DP4 oPos.w, iPos, mvp[3];

DP4 V.x, iPos, mv[0];                      # xform input pos by MV
DP4 V.y, iPos, mv[1];
DP4 V.z, iPos, mv[2];
DP4 V.w, iPos, mv[3];

MOV oPrC, iPrC;                            # copy color

DP4 ptSize.x, V, V;                        # ptSize = 100000 / |Ve|^2
RSQ ptSize.x, ptSize.x;
MUL ptSize.x, ptSize.x, ptSize.x;
MUL oPtS.x, ptSize.x, 100000;

END