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Fixes for calculating point attenuation

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This commit is contained in:
Keith Whitwell
2006-09-04 23:34:36 +00:00
parent f65ad97469
commit 74b2166ff8
1 changed files with 14 additions and 9 deletions
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src/mesa/drivers/dri/i965/brw_vs_tnl.c
+14 -9
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@@ -1375,21 +1375,26 @@ static void build_pointsize( struct tnl_program *p )
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, 0, swizzle1(get_identity_param(p), W));
emit_op2(p, OPCODE_MUL, ut, WRITEMASK_YZ, ut, ureg_negate(swizzle1(eye, Z)));
emit_op2(p, OPCODE_MUL, ut, WRITEMASK_Z, ut, ureg_negate(swizzle1(eye, Z)));
/* 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, 0, ut, state_attenuation);
emit_op2(p, OPCODE_DP3, ut, WRITEMASK_X, ut, state_attenuation);
/* 1 / factor */
emit_op1(p, OPCODE_RCP, ut, 0, ut );
/* 1 / sqrt(factor) */
emit_op1(p, OPCODE_RSQ, ut, WRITEMASK_X, ut );
/* out = pointSize / factor */
emit_op2(p, OPCODE_MUL, out, WRITEMASK_X, ut, state_size);
/* 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);
}