diff options
Diffstat (limited to 'src/mesa/tnl')
| -rw-r--r-- | src/mesa/tnl/t_vp_build.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/mesa/tnl/t_vp_build.c b/src/mesa/tnl/t_vp_build.c index dff062a417c..2a1cae77f29 100644 --- a/src/mesa/tnl/t_vp_build.c +++ b/src/mesa/tnl/t_vp_build.c @@ -1103,7 +1103,9 @@ static void build_fog( struct tnl_program *p ) { struct ureg fog = register_output(p, VERT_RESULT_FOGC); struct ureg input; - + GLuint useabs = p->state->fog_source_is_depth && p->state->fog_mode && + (p->state->fog_mode != FOG_EXP2); + if (p->state->fog_source_is_depth) { input = swizzle1(get_eye_position(p), Z); } @@ -1111,31 +1113,36 @@ static void build_fog( struct tnl_program *p ) input = swizzle1(register_input(p, VERT_ATTRIB_FOG), X); } - if (p->state->tnl_do_vertex_fog) { + if (p->state->fog_mode && p->state->tnl_do_vertex_fog) { struct ureg params = register_param2(p, STATE_INTERNAL, STATE_FOG_PARAMS_OPTIMIZED); struct ureg tmp = get_temp(p); + if (useabs) { + emit_op1(p, OPCODE_ABS, tmp, 0, input); + } + switch (p->state->fog_mode) { case FOG_LINEAR: { struct ureg id = get_identity_param(p); - emit_op3(p, OPCODE_MAD, tmp, 0, input, swizzle1(params,X), swizzle1(params,Y)); + emit_op3(p, OPCODE_MAD, tmp, 0, useabs ? tmp : input, + swizzle1(params,X), swizzle1(params,Y)); emit_op2(p, OPCODE_MAX, tmp, 0, tmp, swizzle1(id,X)); /* saturate */ emit_op2(p, OPCODE_MIN, fog, WRITEMASK_X, tmp, swizzle1(id,W)); break; } case FOG_EXP: - emit_op1(p, OPCODE_ABS, tmp, 0, input); - emit_op2(p, OPCODE_MUL, tmp, 0, tmp, swizzle1(params,Z)); + emit_op2(p, OPCODE_MUL, tmp, 0, useabs ? tmp : input, + swizzle1(params,Z)); emit_op1(p, OPCODE_EX2, fog, WRITEMASK_X, negate(tmp)); break; case FOG_EXP2: emit_op2(p, OPCODE_MUL, tmp, 0, input, swizzle1(params,W)); - emit_op2(p, OPCODE_MUL, tmp, 0, tmp, tmp); + emit_op2(p, OPCODE_MUL, tmp, 0, tmp, tmp); emit_op1(p, OPCODE_EX2, fog, WRITEMASK_X, negate(tmp)); break; } - + release_temp(p, tmp); } else { @@ -1143,7 +1150,7 @@ static void build_fog( struct tnl_program *p ) * * KW: Is it really necessary to do anything in this case? */ - emit_op1(p, OPCODE_MOV, fog, WRITEMASK_X, input); + emit_op1(p, useabs ? OPCODE_ABS : OPCODE_MOV, fog, WRITEMASK_X, input); } } |