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ffvertex: don't compute whole eye vector if only eye.z is required

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This commit is contained in:
Keith Whitwell 2008-05-27 09:48:32 +01:00
parent aa16e3a275
commit dc1537bc25
1 changed files with 27 additions and 3 deletions
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30
src/mesa/main/ffvertex_prog.c
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@ -305,7 +305,7 @@ static struct state_key *make_state_key( GLcontext *ctx )
* generated program with line/function references for each
* instruction back into this file:
*/
#define DISASSEM (MESA_VERBOSE&VERBOSE_DISASSEM)
#define DISASSEM 1
/* Should be tunable by the driver - do we want to do matrix
* multiplications with DP4's or with MUL/MAD's? SSE works better
@ -344,6 +344,7 @@ struct tnl_program {
GLuint temp_reserved;
struct ureg eye_position;
struct ureg eye_position_z;
struct ureg eye_position_normalized;
struct ureg transformed_normal;
struct ureg identity;
@ -728,6 +729,28 @@ static struct ureg get_eye_position( struct tnl_program *p )
}
static struct ureg get_eye_position_z( struct tnl_program *p )
{
if (!is_undef(p->eye_position))
return swizzle1(p->eye_position, Z);
if (is_undef(p->eye_position_z)) {
struct ureg pos = register_input( p, VERT_ATTRIB_POS );
struct ureg modelview[4];
p->eye_position_z = reserve_temp(p);
register_matrix_param5( p, STATE_MODELVIEW_MATRIX, 0, 0, 3,
0, modelview );
emit_op2(p, OPCODE_DP4, p->eye_position_z, 0, pos, modelview[2]);
}
return p->eye_position_z;
}
static struct ureg get_eye_position_normalized( struct tnl_program *p )
{
if (is_undef(p->eye_position_normalized)) {
@ -1240,7 +1263,7 @@ static void build_fog( struct tnl_program *p )
struct ureg input;
if (p->state->fog_source_is_depth) {
input = swizzle1(get_eye_position(p), Z);
input = get_eye_position_z(p);
}
else {
input = swizzle1(register_input(p, VERT_ATTRIB_FOG), X);
@ -1470,7 +1493,7 @@ static void build_texture_transform( struct tnl_program *p )
static void build_pointsize( struct tnl_program *p )
{
struct ureg eye = get_eye_position(p);
struct ureg eye = get_eye_position_z(p);
struct ureg state_size = register_param1(p, STATE_POINT_SIZE);
struct ureg state_attenuation = register_param1(p, STATE_POINT_ATTENUATION);
struct ureg out = register_output(p, VERT_RESULT_PSIZ);
@ -1568,6 +1591,7 @@ create_new_program( const struct state_key *key,
p.state = key;
p.program = program;
p.eye_position = undef;
p.eye_position_z = undef;
p.eye_position_normalized = undef;
p.transformed_normal = undef;
p.identity = undef;