morph_seafloor.nvv

游戏编程精华02－含有几十个游戏编程例子

; Lerps between 2 input meshes and lights the result with
; a directional light
; This example does the lerp in model space
#include "morph.h"

#define R_LERPED_POSITION r7
#define R_LERPED_NORMAL r8
#define R_EYE_POSITION r2
#define R_EYE_DISTANCE r4

vs.1.0

; Transform position to clip space and output it
dp4 oPos.x, v0, c[CV_WORLDVIEWPROJ_0]
dp4 oPos.y, v0, c[CV_WORLDVIEWPROJ_1]
dp4 oPos.z, v0, c[CV_WORLDVIEWPROJ_2]
dp4 oPos.w, v0, c[CV_WORLDVIEWPROJ_3]

dp4 R_EYE_POSITION.x, v0, c[CV_WORLDVIEW_0]
dp4 R_EYE_POSITION.y, v0, c[CV_WORLDVIEW_1]
dp4 R_EYE_POSITION.z, v0, c[CV_WORLDVIEW_2]
dp4 R_EYE_POSITION.w, v0, c[CV_WORLDVIEW_3]

; Write out the model texture coordinates
mov oT0.xy, v2

; Set tex = eye-pos with x,z scaled 1/2
mul oT1.xy, R_EYE_POSITION.xz, c[CV_TEXTURESCALE].y

; Transform normal to eye space
dp3 r1.x, v1, c[CV_WORLDVIEWIT_0]
dp3 r1.y, v1, c[CV_WORLDVIEWIT_1]
dp3 r1.z, v1, c[CV_WORLDVIEWIT_2]

; Normalize transformed normal
dp3 r1.w, r1, r1
rsq r1.w, r1.w											
mul r1, r1,r1.w	

; Calculate light intensity - note alpha is set correctly as well
dp3 r3, r1, c[CV_LIGHT1_DIRECTION]
add oD0, c[CV_LIGHT1_AMBIENT], r3 

; Get distance from camera to eye 
dp3 R_EYE_DISTANCE, R_EYE_POSITION, R_EYE_POSITION
rsq R_EYE_DISTANCE, R_EYE_DISTANCE
rcp R_EYE_DISTANCE, R_EYE_DISTANCE

; (fogend -  d ) / (fogend - fogstart)
add r6.x, c[CV_FOGDATA].y, - R_EYE_DISTANCE.y
mul oFog.x, r6.x, c[CV_FOGDATA].z