drm: add texture_cube_clear_zwrite_vertex_shader_optimize_zscale

drm/cube_rotate_optimize_zscale.vs.asm

@@ -0,0 +1,64 @@
+-- CONST[0] = {theta1, theta2, 0.159155, 0.5}
+-- CONST[1] = {6.283185, -3.141593, 0.2, 0.5}
+
+-- ME_SIN and ME_COS clamp their inputs to [-π,+π] prior to the sin/cos
+-- calculation.
+--
+-- This 3-instruction sequence remaps the range [-∞,+∞] to [-π,+π]
+temp[0].xy   = VE_MAD   const[0].xy__   const[0].zz__  const[0].ww__ ;
+temp[0].xy   = VE_FRC   temp[0].xy__ ;
+temp[0].xy   = VE_MAD   temp[0].xy__   const[1].xx__  const[1].yy__ ;
+
+-- sin and cos
+temp[3].x     = ME_SIN   temp[0].___x ;
+temp[3].y     = ME_COS   temp[0].___x ;
+alt_temp[3].z = ME_SIN   temp[0].___y ;
+
+-- temp[3] now contains:
+-- temp[3] = {sin(theta1), cos(theta1), sin(theta2), cos(theta2)}
+
+-------------------------------------------------------------------------
+-- first rotation: X-axis rotation:
+-------------------------------------------------------------------------
+
+-- y_ = (-z0 * st1)
+-- z_ = ( z0 * ct1)
+temp[1].yz    = VE_MUL   input[0]._-zz_  temp[3]._xy_ ,
+alt_temp[3].w = ME_COS   temp[0].y_ ;
+
+-- x1 = (x0 *   1 +      0)
+-- y1 = (y0 * ct1 + nz0st1)
+-- z1 = (y0 * st1 +  z0ct1)
+temp[1].xyz   = VE_MAD   input[0].xyy_   temp[3].1yx_   temp[1].0yz_ ;
+
+-------------------------------------------------------------------------
+-- second rotation: Y-axis rotation:
+-------------------------------------------------------------------------
+
+-- x_ = (-z1 * st2)
+-- z_ = ( z1 * ct2)
+temp[2].xz    = VE_MUL   temp[1].-z_z_   alt_temp[3].z_w_ ;
+
+-- x2 = (x1 * ct2 + nz1st2)
+-- y2 = (y1 *   1 +      0)
+-- z2 = (x1 * st2 +  z1ct2)
+temp[2].xyz   = VE_MAD   temp[1].xyx_    alt_temp[3].w1z_   temp[2].x0z_ ;
+
+-------------------------------------------------------------------------
+-- scale
+-------------------------------------------------------------------------
+
+-- remap Z from (-1.75, 1.75) to (0.001, 0.999)
+-- 0.285714 (z + 1.75) + 0.001
+
+-- remap W from (-1.75, 1.75) to (1, 2)
+-- 0.285714 (z + 1.75) + 1
+
+temp[3].xyz   = VE_MAD   temp[2].xyz_    const[2].xx1_  const[2].00y_ ;
+
+-------------------------------------------------------------------------
+-- output
+-------------------------------------------------------------------------
+
+out[0].xyzw   = VE_MAD   temp[3].xyzz    const[2].11zz  const[2].00w1 ;
+out[1].xyzw   = VE_ADD   input[1].xyzw   input[1].0000 ;