/* Seems like it could be tighter:
*/
static void build_pointsize( struct tnl_program *p )
{
struct ureg eye = get_eye_position(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);
struct ureg ut = get_temp(p);
/* 1, Z, Z * Z, 1 */
emit_op1(p, OPCODE_MOV, ut, WRITEMASK_XW, swizzle1(get_identity_param(p), W));
emit_op1(p, OPCODE_ABS, ut, WRITEMASK_YZ, swizzle1(eye, Z));
emit_op2(p, OPCODE_MUL, ut, WRITEMASK_Z, ut, ut);
/* p1 + p2 * dist + p3 * dist * dist, 0 */
emit_op2(p, OPCODE_DP3, ut, WRITEMASK_X, ut, state_attenuation);
/* 1 / sqrt(factor) */
emit_op1(p, OPCODE_RSQ, ut, WRITEMASK_X, ut );
/* ut = pointSize / factor */
emit_op2(p, OPCODE_MUL, ut, WRITEMASK_X, ut, state_size);
/* Clamp to min/max - state_size.[yz]
*/
emit_op2(p, OPCODE_MAX, ut, WRITEMASK_X, ut, swizzle1(state_size, Y));
emit_op2(p, OPCODE_MIN, out, 0, swizzle1(ut, X), swizzle1(state_size, Z));
release_temp(p, ut);
}
/**
* Point size attenuation computation.
*/
static void build_atten_pointsize( struct tnl_program *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);
struct ureg ut = get_temp(p);
/* dist = |eyez| */
emit_op1(p, OPCODE_ABS, ut, WRITEMASK_Y, swizzle1(eye, Z));
/* p1 + dist * (p2 + dist * p3); */
emit_op3(p, OPCODE_MAD, ut, WRITEMASK_X, swizzle1(ut, Y),
swizzle1(state_attenuation, Z), swizzle1(state_attenuation, Y));
emit_op3(p, OPCODE_MAD, ut, WRITEMASK_X, swizzle1(ut, Y),
ut, swizzle1(state_attenuation, X));
/* 1 / sqrt(factor) */
emit_op1(p, OPCODE_RSQ, ut, WRITEMASK_X, ut );
#if 0
/* out = pointSize / sqrt(factor) */
emit_op2(p, OPCODE_MUL, out, WRITEMASK_X, ut, state_size);
#else
/* this is a good place to clamp the point size since there's likely
* no hardware registers to clamp point size at rasterization time.
*/
emit_op2(p, OPCODE_MUL, ut, WRITEMASK_X, ut, state_size);
emit_op2(p, OPCODE_MAX, ut, WRITEMASK_X, ut, swizzle1(state_size, Y));
emit_op2(p, OPCODE_MIN, out, WRITEMASK_X, ut, swizzle1(state_size, Z));
#endif
release_temp(p, ut);
}
static void build_pointsize( struct tnl_program *p )
{
struct ureg eye = get_eye_position(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);
struct ureg ut = get_temp(p);
/* dist = |eyez| */
emit_op1(p, OPCODE_ABS, ut, WRITEMASK_Y, swizzle1(eye, Z));
/* p1 + dist * (p2 + dist * p3); */
emit_op3(p, OPCODE_MAD, ut, WRITEMASK_X, swizzle1(ut, Y),
swizzle1(state_attenuation, Z), swizzle1(state_attenuation, Y));
emit_op3(p, OPCODE_MAD, ut, WRITEMASK_X, swizzle1(ut, Y),
ut, swizzle1(state_attenuation, X));
/* 1 / sqrt(factor) */
emit_op1(p, OPCODE_RSQ, ut, WRITEMASK_X, ut );
#if 1
/* out = pointSize / sqrt(factor) */
emit_op2(p, OPCODE_MUL, out, WRITEMASK_X, ut, state_size);
#else
/* not sure, might make sense to do clamping here,
but it's not done in t_vb_points neither */
emit_op2(p, OPCODE_MUL, ut, WRITEMASK_X, ut, state_size);
emit_op2(p, OPCODE_MAX, ut, WRITEMASK_X, ut, swizzle1(state_size, Y));
emit_op2(p, OPCODE_MIN, out, WRITEMASK_X, ut, swizzle1(state_size, Z));
#endif
release_temp(p, ut);
}
/**
* Either return a precalculated constant value or emit code to
* calculate these values dynamically in the case where material calls
* are present between begin/end pairs.
*
* Probably want to shift this to the program compilation phase - if
* we always emitted the calculation here, a smart compiler could
* detect that it was constant (given a certain set of inputs), and
* lift it out of the main loop. That way the programs created here
* would be independent of the vertex_buffer details.
*/
static struct ureg get_scenecolor( struct tnl_program *p, GLuint side )
{
if (p->materials & SCENE_COLOR_BITS(side)) {
struct ureg lm_ambient = register_param1(p, STATE_LIGHTMODEL_AMBIENT);
struct ureg material_emission = get_material(p, side, STATE_EMISSION);
struct ureg material_ambient = get_material(p, side, STATE_AMBIENT);
struct ureg material_diffuse = get_material(p, side, STATE_DIFFUSE);
struct ureg tmp = make_temp(p, material_diffuse);
emit_op3(p, OPCODE_MAD, tmp, WRITEMASK_XYZ, lm_ambient,
material_ambient, material_emission);
return tmp;
}
else
return register_param2( p, STATE_LIGHTMODEL_SCENECOLOR, side );
}
