particle_oriented_animated: improve vertex shader constant comments

drm/shadertoy_palette_fractal_loop_inner.fs.asm

@@ -48,6 +48,7 @@ srcp.rgb = add       : -- (vec3(0.25, 0.40625, 0.5625) + 0.5)
 src0.rgb = temp[3] : -- v
   temp[3].rgb = FRC src0.rgb ;
 
+-- v = v - 0.5
 src0.rgb = temp[3]   , -- v
 src1.rgb = float(48) : -- 0.5
   temp[3].rgb = MAD src0.111 src0.rgb -src1.rgb ;

drm/shadertoy_palette_fractal_loop_inner.fs.inc

@@ -0,0 +1,224 @@
+0x00001800,
+0x08020001,
+0x080200bc,
+0x00ed8720,
+0x00000000,
+0x00790010,
+
+0x00001800,
+0x08020001,
+0x08020080,
+0x00000720,
+0x00000000,
+0x00000019,
+
+0x00001800,
+0x08020001,
+0x0802c080,
+0x00fb0720,
+0x00000000,
+0x00f6d010,
+
+0x00004000,
+0x08020000,
+0x08020080,
+0x00840420,
+0x00000001,
+0x00000001,
+
+0x00004000,
+0x08020080,
+0x08020000,
+0x00000000,
+0x0004c00b,
+0x00000000,
+
+0x00004000,
+0x08020080,
+0x08020000,
+0x00000000,
+0x0000c00a,
+0x00000000,
+
+0x00004000,
+0x08020080,
+0x00300100,
+0x00000000,
+0x0060e010,
+0x1a000000,
+
+0x00004000,
+0x08020100,
+0x08000500,
+0x00000000,
+0x00600010,
+0x1a000000,
+
+0x00003800,
+0x8802c102,
+0x08020001,
+0x006d86d8,
+0x00000000,
+0x00223030,
+
+0x00003800,
+0x08020003,
+0x08020080,
+0x00000220,
+0x00000000,
+0x00000039,
+
+0x00003800,
+0x0802c003,
+0x08020080,
+0x004406d8,
+0x00000000,
+0x00a21030,
+
+0x00000800,
+0x08020003,
+0x08020080,
+0x00000000,
+0x0000000d,
+0x0000003a,
+
+0x00001000,
+0x08020003,
+0x08020080,
+0x00000000,
+0x0000400d,
+0x0000003a,
+
+0x00002000,
+0x08020003,
+0x08020080,
+0x00000000,
+0x0000800d,
+0x0000003a,
+
+0x00003800,
+0x0802c003,
+0x08020080,
+0x00440221,
+0x00000000,
+0x00221030,
+
+0x00004000,
+0x08020080,
+0x08020000,
+0x00000000,
+0x0002c018,
+0x00000000,
+
+0x00004000,
+0x08020001,
+0x08020080,
+0x00840420,
+0x00000001,
+0x00000001,
+
+0x00004000,
+0x08020080,
+0x08020000,
+0x00000000,
+0x0004c00b,
+0x00000000,
+
+0x00004000,
+0x08020080,
+0x08020000,
+0x00000000,
+0x0000c00a,
+0x00000000,
+
+0x00004000,
+0x08020080,
+0x08000400,
+0x00000000,
+0x0068c010,
+0x20000000,
+
+0x00004000,
+0x10020080,
+0x08034001,
+0x00000000,
+0x0068c010,
+0x04000000,
+
+0x00004000,
+0x08040480,
+0x0b020001,
+0x00000000,
+0x0028c010,
+0x1c000000,
+
+0x00004000,
+0x08020080,
+0x08020001,
+0x00000000,
+0x0000c017,
+0x00000000,
+
+0x00004000,
+0x08020080,
+0x0802c001,
+0x00000000,
+0x00618010,
+0x5a000000,
+
+0x00004000,
+0x08020080,
+0x08020001,
+0x00000000,
+0x1800c01c,
+0x00000000,
+
+0x00004000,
+0x08020080,
+0x08020001,
+0x00000000,
+0x0004c01a,
+0x00000000,
+
+0x00004000,
+0x08040080,
+0x08020001,
+0x00000000,
+0x0048c010,
+0x20000000,
+
+0x00004000,
+0x08020080,
+0x08020001,
+0x00000000,
+0x0000c019,
+0x00000000,
+
+0x00004000,
+0x08040080,
+0x08020001,
+0x00000000,
+0x0028c010,
+0x20000000,
+
+0x00004000,
+0x08020080,
+0x08020001,
+0x00000000,
+0x0000c018,
+0x00000000,
+
+0x00003800,
+0x00220003,
+0x08000480,
+0x006da220,
+0x00000000,
+0x00222020,
+
+0x00004000,
+0x08020080,
+0x08020003,
+0x00000000,
+0x00618030,
+0x30000000,
+

src/particle_oriented_animated.cpp

@@ -430,7 +430,7 @@ void _3d_particle(const shaders& shaders,
 
   mat4x4 local_to_view = world_to_view * local_to_world;
 
-  mat4x4 trans = world_to_clip * local_to_world;
+  mat4x4 local_to_clip = world_to_clip * local_to_world;
 
   //////////////////////////////////////////////////////////////////////////////
   // consts
@@ -447,26 +447,26 @@ void _3d_particle(const shaders& shaders,
     //ib_vap_pvs_const_offset(position_consts, (sizeof (position_consts)), 6);
 
     const float consts[] = {
-    // 0
-    trans[0][0], trans[0][1], trans[0][2], trans[0][3],
-    trans[1][0], trans[1][1], trans[1][2], trans[1][3],
-    trans[2][0], trans[2][1], trans[2][2], trans[2][3],
-    trans[3][0], trans[3][1], trans[3][2], trans[3][3],
+      // 0: local space to clip space transformation matrix
+      local_to_clip[0][0], local_to_clip[0][1], local_to_clip[0][2], local_to_clip[0][3],
+      local_to_clip[1][0], local_to_clip[1][1], local_to_clip[1][2], local_to_clip[1][3],
+      local_to_clip[2][0], local_to_clip[2][1], local_to_clip[2][2], local_to_clip[2][3],
+      local_to_clip[3][0], local_to_clip[3][1], local_to_clip[3][2], local_to_clip[3][3],
 
-    // 4: dx (right)
+      // 4: dx ("right" change of basis vector)
       local_to_view[0][0], local_to_view[0][1], local_to_view[0][2], 0,
 
-    // 5: dy (up)
+      // 5: dy ("up" change of basis vector)
       local_to_view[1][0], local_to_view[1][1], local_to_view[1][2], 0,
 
-    // 6: xyz:position w:scale
+      // 6: particle position, scale
       position.x, position.y, position.z, scale
     };
     ib_vap_pvs_const_cntl(consts, (sizeof (consts)));
 
     // plane_inner
 
-    _3d_plane_inner(trans);
+    _3d_plane_inner(local_to_clip);
   }
 }