diff options
Diffstat (limited to 'src/mesa/shader/program.c')
| -rw-r--r-- | src/mesa/shader/program.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/mesa/shader/program.c b/src/mesa/shader/program.c index d301f19090a..7e6cd26c55e 100644 --- a/src/mesa/shader/program.c +++ b/src/mesa/shader/program.c @@ -996,6 +996,30 @@ _mesa_fetch_state(GLcontext *ctx, const enum state_index state[], } break; } + case STATE_FOG_PARAMS_OPTIMIZED: + /* this makes it possible to use simpler per-vertex fog calcs. POW + (for EXP/EXP2 fog) might be more expensive than EX2 on some hw, + plus it needs another constant (e) anyway. Linear fog can now be + done with a single MAD. + linear: fogcoord * -1/(end-start) + end/(end-start) + exp: 2^-(density/ln(2) * fogcoord) + exp2: 2^-((density/(ln(2)^2) * fogcoord)^2) */ + value[0] = -1.0F / (ctx->Fog.End - ctx->Fog.Start); + value[1] = ctx->Fog.End / (ctx->Fog.End - ctx->Fog.Start); + value[2] = ctx->Fog.Density * ONE_DIV_LN2; + value[3] = ctx->Fog.Density * ONE_DIV_SQRT_LN2; + break; + case STATE_SPOT_DIR_NORMALIZED: { + /* here, state[2] is the light number */ + /* pre-normalize spot dir */ + const GLuint ln = (GLuint) state[2]; + value[0] = ctx->Light.Light[ln].EyeDirection[0]; + value[1] = ctx->Light.Light[ln].EyeDirection[1]; + value[2] = ctx->Light.Light[ln].EyeDirection[2]; + NORMALIZE_3FV(value); + value[3] = ctx->Light.Light[ln]._CosCutoff; + break; + } default: /* unknown state indexes are silently ignored * should be handled by the driver. @@ -1075,6 +1099,10 @@ make_state_flags(const GLint state[]) return _NEW_MODELVIEW; case STATE_TEXRECT_SCALE: return _NEW_TEXTURE; + case STATE_FOG_PARAMS_OPTIMIZED: + return _NEW_FOG; + case STATE_SPOT_DIR_NORMALIZED: + return _NEW_LIGHT; default: /* unknown state indexes are silently ignored and * no flag set, since it is handled by the driver. @@ -1232,6 +1260,8 @@ append_token(char *dst, enum state_index k) case STATE_INTERNAL: case STATE_NORMAL_SCALE: case STATE_POSITION_NORMALIZED: + case STATE_FOG_PARAMS_OPTIMIZED: + case STATE_SPOT_DIR_NORMALIZED: append(dst, "(internal)"); break; default: |